【CSS】1278- 不错的 SCSS 使用技巧总结（1w字）

前言

今时不同往日，能叫我们切图仔的只能是我们自己！

在JavasScrip框架满天飞的年代，前端三板斧之一的CSS也前前后后涌出Sass、Less 、Stylus等多款CSS预处理框架。

今天我们要讲的就是其中的的老大哥Sass的升级版Scss，Scss给我们提供了变量 、循环 、继承 、混入、函数等一系列强大的功能以方便我们开发。

以前觉得Scss简单，后来发现，简单是真的简单，我菜也是真的菜

如果文章对你有帮助的话，记得一键三连哟。有问题和疑惑的话也可以在评论区留言。我会第一时间回复大家，如果觉得我的文章哪里有知识点错误的话，也恳请能够告知，把错的东西理解成对的，无论在什么行业，都是致命的。

Scss和Sass

Sass从第三代开始，放弃了缩进式风格，并且完全向下兼容普通的CSS代码，这一代的Sass也被称为Scss。

文档

单文件编译可以在下面的网站进行操作，多文件编译见下下节，中文文档缺失的东西挺多的，有条件的可以翻看英文文档。

• 中文文档：https://www.sass.hk
• 英文文档：https://sass-lang.com/documentation
• CSS转Scss：https://www.sass.hk/css2sass
• Scss转CSS：https://www.sassmeister.com

Sass版本

Sass有三个版本Dart Sass、libsass和Ruby Sass：

1. Dart Sass，用Dart语言写的sass实现，于2016年11月1日发布alpha版本，版本1.23.0之后完全支持模块化机制。
2. libSass也就是俗称的node-sass，用c/c++实现的sass版本，使用非常广泛。node-sass是绑定了 libsass的nodejs库，可以极快的将.scss 文件编译为.css文件，这个安装过程……，懂的都懂，官方也不推荐再使用了。
3. Ruby Sass，是最初的Sass实现，但是2019年3月26日被停止了，以后也不会再支持，使用者需要迁移到别的实现上。

环境配置

中文文档的安装教程是Ruby Sass，个人推荐使用npm安装Dart Sass，这也是官方推荐的方式。

全局安装

npm默认安装的是Dart Sass了。

npm install -g sass

项目结构

code
    --css
        --index.scss
    --dist

监听运行

使用命令行操作，监听文件夹下的scss文件并输出为css文件，如果是webpack项目，则需要使用sass-loader。

sass --style=expanded  -w css:dist --no-source-map

Live Sass Compiler

如果你使用的VSCode的Live Sass Compiler插件，可以参考我的配置，这个插件用的 Sass版本是LibSass3.5.4，对有些指令存在兼容性和不支持的情况。

"liveSassCompile.settings":{
        "generateMap":false,
        "formats":[
            {
                "format": "expanded",
                "savePath": "~/css/",
            }
        ]
}

输出格式

嘿嘿，下面正文术语都同统一改为小写哈。 scss提供了四种输出格式，在命令行中使用 --style 选项进行设置，在Live Sass Compiler中配置format参数。

注：dart sass只支持expanded和compressed。

sass --watch style.scss:style.css --style compressed

:nested

nested是 scss默认的输出格式，选择器与属性等单独占用一行，缩进量与 scss文件中一致，每行的缩进量反映了其在嵌套规则内的层数。

#main {
  color: #fff;
  background-color: #000; }
  #main p {
    width: 10em; }

.p {
  font-size: 10em;
  font-weight: bold;
  text-decoration: underline; }

:expanded

expanded输出像是我们平常手写的样式，选择器、属性等各占用一行，属性根据选择器缩进，而选择器不做任何缩进。

#main {
  color: #fff;
  background-color: #000;
}
#main p {
  width: 10em;
}

.p {
  font-size: 10em;
  font-weight: bold;
  text-decoration: underline;
}

:compact

compact会将每条 css 规则归纳为一行。嵌套过的选择器在输出时没有空行，不嵌套的选择器会输出空白行作为分隔符。

#main { color: #fff; background-color: #000; }
#main p { width: 10em; }

.p { font-size: 10em; font-weight: bold; text-decoration: underline; }

:compressed

compressed会删除所有无意义的空格、空白行、以及注释，力求将文件体积压缩到最小，同时也会做出其他调整，比如会自动替换占用空间最小的颜色表达方式。

#main{color:#fff;background-color:#000}#main p{width:10em}.p{font-size:10em;font-weight:bold;text-decoration:underline}

语法嵌套规则

选择器嵌套

css中重复写选择器是非常恼人的。尤其是html结构嵌套非常深的时候，scss的选择器嵌套可以避免重复输入父选择器，可以有效的提高开发效率，减少样式覆盖可能造成的异常问题。这也是我们最常用的功能。很多人用scss就只用了这个功能，然后觉得自己会了。

这个是正常的css结构

.container {
    width: 1200px;
    margin: 0 auto;
}
.container .header .img {
    width: 100px;
    height: 60px;
}

编译成scss的样子，子元素向父元素内部嵌套了。

.container {
    width: 1200px;
    margin: 0 auto;
    .header {
        .img {
            width: 100px;
            height: 60px;
        }
    }
}

属性嵌套

有些css属性遵循相同的命名空间 (相同的开头)，比如font-family，font-size，font-weight都以font作为属性的命名空间。为了便于管理这样的属性，也为了避免重复输入。（这个编辑器提示有点不太理想……，不是很好用）。

.container {
  font: {
    family: fantasy;
    size: 30em;
    weight: bold;
  }
}

编译成css

.container {
  font-family: fantasy;
  font-size: 30em;
  font-weight: bold;
}

命名空间也可以包含自己的属性值

.container {
  color: red {
    adjust: fantasy;
  }
}

编译成css

.container {
  color: red;
  color-adjust: fantasy;
}

父选择器&

在嵌套 css规则时，有时会需要使用嵌套外层的父选择器，例如，当给某个元素设定 hover 样式时，可以用& 代表嵌套规则外层的父选择器，scss在编译时会把&替换成父选择器名。

案例里面的&表示的就是父级a选择器

.container {
    a {
        color: #333;
        &:hover {
             text-decoration: underline;
             color: #f00;
        }
    }
}

转化成scss

.container a {
    color:#333;
}
.container a:hover {
    text-decoration:underline;
    color:#F00;
}

换个思路，也可以使用&进行选择器名称拼接。

.main {
    color: black;
    &-sidebar { border: 1px solid; }
}

转化成css

.main {
    color: black;
}
.main-sidebar {
    border: 1px solid;
}

Scss的两种注释

多行注释/* ... */

多行注释会编译到.css文件中,compressed（压缩）模式下除外， 将 !作为多行注释的第一个字符表示在压缩输出模式下也保留这条注释，通常用于添加版权信息。

/*!
* 我是
* 多行
* 注释
*/
body { color: black; }

编译成css

/*!
* 我是
* 多行
* 注释 
*/body{color:#000}

单行注释//

单行注释不会编译到.css文件

// 我是单行注释
body { color: black; }

编译成css

body {
  color: black;
}

变量

使用

原生css中的变量，使用--变量名:变量值定义，var(--变量名)进行使用。

:root {
    --color: #F00;
}
p {
    color: var(--color);
}

scss中的变量，以美元符号$开头，赋值方法与 css属性的写法一样。

$color:#F00;
p {
    color: $color;
}

转行成css

p {
    color: #F00;
}

5条变量规则

下文的mixin和function命名也遵循1234条规则：

1. 变量以美元符号$开头，后面跟变量名；
2. 变量名是不以数字开头的可包含字母、数字、下划线、横线（连接符）；
3. 通过连接符-与下划线_定义的同名变量为同一变量；
4. 变量一定要先定义，后使用；
5. 写法同css，即变量名和值之间用冒号:分隔；

2种变量作用域

1 . 变量作用域分为全局变量域和局部变量域：

• 全局变量：声明在最外层的变量，可在任何地方使用；
• 局部变量：嵌套规则内定义的变量只能在嵌套规则内使用。

2 . 将局部变量转换为全局变量可以添加!global 声明。

<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    $<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">500px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    $<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">16px !global;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: $font-size;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: $color;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: $height;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.footer {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/**$font-size使用!global 申明成全局变量了*/<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: $font-size; <br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/**<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    * Error: Undefined variable. <br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    * $height是.container下的局部变量，无法在.footer下面编译<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height:$height;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
.container {

    font-size: 16px;

    color: red;

    height: 500px;

}



.footer {

     /**$font-size使用!global 申明成全局变量了*/

    font-size: 16px;

}


```
```
7种主要的数据类型
scss支持7种主要的数据类型：

数字，1rem、2vh、13、 10px；
字符串，分有引号字符串与无引号字符串，"foo"、 'bar'、baz；
颜色，blue, #04a3f9, rgba(255,0,0,0.5)；
布尔型，true和false；
空值，null是其类型的唯一值。表示缺少值，通常由函数返回以表示缺少结果；
数组 (list)，用空格或逗号作分隔符，1.5em 1em 0 2em,Helvetica,Arial,sans-serif；
maps， 相当于 JavaScript的 object，(key1: value1, key2: value2)；

官网中把Function也当作一种类型，点击原文了解。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">layer-index: 10;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-width: 3<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-weight: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">bold;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-base-family: "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Open <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Sans", <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Helvetica, <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Sans-Serif;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">block-base-padding: 6<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px 10<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px 6<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px 10<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">top-bg-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">rgba(255, 147, 29, 0<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.6);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blank-mode: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">true;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">var: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">null;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">fonts: (<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">serif: "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Helvetica <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Neue",<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">monospace: "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Consolas",<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-family: $font-base-family;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: $font-size;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: $block-base-padding;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  @if $blank-mode {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#000;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  } <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#fff;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">type-of($<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">var);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">length($<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">var);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">top-bg-color;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>// 如果列表中包含空值，则生成的<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">CSS中将忽略该空值。<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.wrap {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">18px $font-weight <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">map-get($fonts, <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"sans");<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
.container {

  font-family: "Open Sans", Helvetica, Sans-Serif;

  font-size: 16px;

  padding: 6px 10px 6px 10px;

  background-color: #000;

  content: null;

  content: 1;

  color: rgba(255, 147, 29, 0.6);

}



.wrap {

  font: 18px bold; // 如果列表中包含空值，则生成的CSS中将忽略该空值。

}


```
```
scss属性也支持其他值，比如Unicode字符集，或!important 声明。但是scss 不会特殊对待这些属性值，一律视为无引号字符串。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color:$color <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">!important;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
.container {

  color: red !important;

}


```
```
!default
可以在变量的结尾添加!default来给变量设置默认值，有点类似Javascript的逻辑运算符let content=content || "Second content"。注意，变量是 null时将视为未被!default赋值。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">First <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>// 如果$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content之前没定义就使用如下的默认值<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Second <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content" !<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">default;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#main {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: $content;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
#main {

  content: "First content";

}


```
```
圆括号
圆括号()可以用来影响运算的顺序，和数学中的效果是一致的。
运算符
相等运算==和不相等运算!=。所有数据类型均支持 == 和!=，另外，每种数据类型也有其各自支持的运算方式。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">theme<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:"blue";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @if $theme=="blue" {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blue;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @if $theme !="blue" {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blue;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为`css`

```
.container {

  background-color: red;

}



.container {

  background-color: blue;

}


```
```
关系运算符
四个关系运算符< > >= <=
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">theme<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:3;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @if $theme >= 5 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blue;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为`css`

```
.container {

    background-color: blue;

}


```
```
布尔运行符
三个布尔运算符and or not
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: 100;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: 200;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">last: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">false;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">div {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  @if $width>50 and $height<300 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">16px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  } <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: 14<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@if <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">not $last {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  } <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blue;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@if $width><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">500 <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">or $height<<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">300{<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">line-height: 20<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  } <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">line-height: 50<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为`css`

```
div {

    font-size: 16px;

    border-color: red;

    line-height: 20px;

}div {

    font-size: 16px;

    border-color: red;

}


```
```
数字操作符
+ - * / %
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* 纯数字与百分号或单位运算时会自动转化成相应的百分比与单位值 */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* ================== + 运算===================== */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50 + <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50 + <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50% + <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10pt + <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10pt + <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* ================== - 运算===================== */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50 - <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10 - <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50pt - <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* ================== * 运算===================== */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50 * <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10 * <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50 * <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">2px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50pt * <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">4;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* ==================/ 运算 (除完后最多只能保留一种单位)===================== */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    $<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">100px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10/<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px / <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px / <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: ($width/<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">2); // 使用变量与括号<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: (<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">500px/<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">2); // 使用了括号<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* ==================% 求余运算===================== */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10 % <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">3;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50px % <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">7;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50% % <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">7;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
/* 纯数字与百分号或单位运算时会自动转化成相应的百分比与单位值 */

.container {

    /* ================== + 运算===================== */

    width: 70;

    width: 70%;

    width: 70%;

    width: 25pt;

    width: 30pt;

    /* ================== - 运算===================== */

    height: 30;

    height: -10%;

    height: 35pt;

    /* ================== * 运算===================== */

    height: 1500;

    height: 300%;

    height: 100px;

    height: 200pt;

    /* ==================/ 运算 (除完后最多只能保留一种单位)===================== */

    width: 10/5;

    width: 10px/5px;

    width: 10px/20;

    width: 50px;

    height: 250px;

    /* ==================% 运算===================== */

    width: 1;

    width: 1px;

    width: 1%;

}


```
```
/在css中有分隔数字的用途，在scss中，以下三种情况会进行除法运算：

如果值或值的一部分，是变量或者函数的返回值；
如果值被圆括号包裹；
如果值是算数表达式的一部分。

<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: 1000<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">div {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">16px/<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30px Arial, Helvetica, sans-serif; // 不运算<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: ($width/<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">2); // 使用变量与括号<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: (#{$width}/2); // 使用 #{} 插值语句将变量包裹，避免运算。<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">round(10)/2; // 使用了函数<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: (500<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px/2); // 使用了括号<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-left: 5<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px + 8<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px/2<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px; // 使用了+表达式<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
div {

    font: 16px/30px Arial, Helvetica, sans-serif;

    width: 500px;

    width: 1000px/2;

    z-index: 5;

    height: 250px;

    margin-left: 9px;

}


```
```
如果需要使用变量，同时又要确保 / 不做除法运算而是完整地编译到 css文件中，只需要用 #{} 插值语句将变量包裹。
字符串运算

+可用于连接字符串；
如果有引号字符串（位于 + 左侧）连接无引号字符串，运算结果是有引号的；
无引号字符串（位于 + 左侧）连接有引号字符串，运算结果则没有引号。

<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"Foo " + Bar;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-family: sans- + <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"serif";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为`css`

```
.container {

    content: "Foo Bar";

    font-family: sans-serif;

}


```
```
插值语句
文章上面有讲到插值语句，这里来解释一下。
通过 #{} 插值语句可以在选择器、属性名、注释中使用变量，使用#{}插值语句将变量包裹起来即可，和js中的模板字符串很像。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: 12<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">line-height: 30<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">class-name: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">danger;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">attr: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">author: "福大命大";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">p {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font: #{$font-size}/#{$line-height} <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Arial <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Helvetica, <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">sans-serif;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* <br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>* 这是文件的说明部分<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>* @author: #{$author}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>*/<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">a.#{$class-name} {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    border-#{$attr}: <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成`css`

```
p {

    font: 12px/30px Arial Helvetica, sans-serif;

}



/* 

* 这是文件的说明部分

* @author: 福大命大

*/

a.danger {

    border-color: #f00;

}


```
```
流程控制
sass中流程控制包含四类，也是我们在js中常见的@if、@for、@each、@while。
@if
@if语法和js类似，基本格式是@if...@else if...@else。
使用
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">theme<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:3;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @if $theme >= 5 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blue;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为`css`

```
.container {

    background-color: blue;

}


```
```
案例
这里已一个利用mixin和if封装一个三角形生成，mixin知识后面又讲到。

<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@mixin triangle($<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">direction:top, $<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">size:<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30px, $<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color:black) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: 0<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: 0<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">display: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">inline-block;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-width: $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">size;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-#{$direction}<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">-width: 0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@if ($direction==top) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-style: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">solid <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else if($direction==right) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-style: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">solid;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else if($direction==bottom) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-style: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">solid <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@else if($direction==left) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-style: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">solid <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">dashed;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p0 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     @include triangle($<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">size:<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50px);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     @include triangle(right, 50px, red);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @include triangle(bottom, 50px, blue);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>     @include triangle(left, 50px, green);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
.p0 {

    width: 0px;

    height: 0px;

    display: inline-block;

    border-width: 50px;

    border-top-width: 0;

    border-color: transparent transparent black transparent;

    border-style: dashed dashed solid dashed;

}



.p1 {

    width: 0px;

    height: 0px;

    display: inline-block;

    border-width: 50px;

    border-right-width: 0;

    border-color: transparent transparent transparent red;

    border-style: dashed dashed dashed solid;

}



.p2 {

    width: 0px;

    height: 0px;

    display: inline-block;

    border-width: 50px;

    border-bottom-width: 0;

    border-color: blue transparent transparent transparent;

    border-style: solid dashed dashed dashed;

}



.p3 {

    width: 0px;

    height: 0px;

    display: inline-block;

    border-width: 50px;

    border-left-width: 0;

    border-color: transparent green transparent transparent;

    border-style: dashed solid dashed dashed;

}


```
```
@for
for在条件范围内重复操作，这个指令包含两种格式：

@for $var from <start> through <end>；
@for $var from <start> to <end>。

两者区别在于 through 与 to的含义：

使用 through时，条件范围包含 <start> 与 <end>的值；
使用 to时条件范围只包含<start>的值不包含<end>的值；
$var 可以是任何变量，比如$i，<start> 和 <end> 必须是整数值。

<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@for $i from <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1 to <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#loading <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">span<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:nth-child(#{$i}) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>      <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20 * ($i - <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1) + px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
#loading span:nth-child(1) {

    width: 0px;

}



#loading span:nth-child(2) {

    width: 20px;

}


```
```
如果把to换成through
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#loading <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">span<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:nth-child(1) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#loading <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">span<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:nth-child(2) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#loading <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">span<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:nth-child(3) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">40px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### @each

`@each`指令的格式是`@each $var in $list` , `$var`可以是任何变量名，比如`$length` 或者`$name`，而`$list`是一连串的值，也就是值列表。

```
$color-list:red green blue turquoise darkmagenta;

@each $color in $color-list {

    $index: index($color-list, $color);

    .p#{$index - 1} {

        background-color: $color;

    }

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p0 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: green;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: blue;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: turquoise;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p4 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: darkmagenta;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### @while

`@while` 指令循环输出直到表达式返回结果为 `false`。这样可以实现比`@for` 更复杂的循环。

比如，可以借此生成栅格化布局。

```
$column:12;

@while $column>0 {

   .col-sm-#{$column} {

      width: $column / 12 * 100%;

   }

    $column:$column - 1;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-12 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">100%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-11 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">91.6666666667%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-10 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">83.3333333333%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-9 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">75%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-8 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">66.6666666667%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-7 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">58.3333333333%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-6 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">50%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-5 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">41.6666666667%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-4 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">33.3333333333%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">25%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">16.6666666667%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.col-sm-1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">8.3333333333%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


@import
-------

`@import`算是一个比较简易的模块系统。`scss`拓展了`@import` 的功能，允许其导入 `scss`或 `sass`文件。被导入的文件将合并编译到同一个 `css`文件中，被导入的文件中所包含的变量或者混合指令 (`mixin`) 都可以在导入的文件中使用。


### 使用

*common.scss*

```
$color:red;


```
```
index.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"common.scss";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: $color;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译成

```
.container {

  border-color: red;

}


```
```
以下情况下，@import 仅作为普通的css语句，不会导入scss文件：

文件拓展名是.css；
文件名以 http://开头；
文件名是url()；
@import包含媒体查询。

<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"common.css";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import url(common);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"http://xxx.com/xxx";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">'landscape' screen <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">and (<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">orientation:landscape);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

`scss`允许同时导入多个文件，例如同时导入 `rounded-corners` 与`text-shadow` 两个文件，不用再单独写个`import`引入。

```
@import "rounded-corners", "text-shadow";


```
```
导入文件也可以使用 #{} 插值语句（下面有讲，这里把它理解成js中模板字符串就行）动态导入，但不是通过变量动态导入 scss文件，只能作用于 css的 url()导入方式
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">family: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">unquote("<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Droid+<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Sans");<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import url(<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"http://fonts.googleapis.com/css?family=#{$family}");<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
@import url("http://fonts.googleapis.com/css?family=Droid+Sans");


```
```
@Partials
如果需要导入 scss或者 sass文件，但又不希望将其编译为 css，只需要在文件名前添加下划线，这样会告诉 scss不要编译这些文件。注意：

导入语句中却不需要添加下划线；
不可以同时存在添加下划线与未添加下划线的同名文件，添加下划线的文件将会被忽略。

_common.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

***index.scss***

```
@import "common.scss";

.container {

    border-color: $color;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: red;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

`_common.scss`文件不会编译成`_common.css`文件。

![](https://oss-cn-hangzhou.aliyuncs.com/codingsky/cdn/img/2022-04-02/9a80fc0d8c42709620fbdff3b3a98b24)
`Partials`主要是用来定义公共样式的，专门用于被其他的 `scss`文件 `import`进行使用的。


### 嵌套@import

大多数情况下，一般在文件的最外层（不在嵌套规则内）使用`@import`，其实，也可以将`@import` 嵌套进内层选择器或者 `@media` 中，与平时的用法效果相同，只是这样导入的样式只能出现在嵌套的层中，存在作用域。

*common.scss*

```
.example {

    color: red;

}


```
```
index.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#main {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @import "example";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

被编译成

```
#main .example {

    color: red;

}


```
```
注意：@import不能嵌套使用在控制指令或混入中（带有@符号的叫指令）。
@media 媒体查询增强
scss中，@media 指令与 css中用法一样，只是增加了一点额外的功能，允许在css规则中嵌套。如果@media 嵌套在 css规则内，编译时，@media 将被编译到文件的最外层，包含嵌套的父选择器。这个让 @media 方便不少，不需要重复写选择器，也不会打乱 css的书写流程。
使用
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.sidebar {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">300px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  @media screen and (<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">orientation: landscape) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">500px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    .item {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>      <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: auto;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
.sidebar {

    width: 300px;

}

@media screen and (orientation: landscape) {

  .sidebar {

    width: 500px;

  }

  .sidebar .item {

    height: auto;

  }

}


```
```
嵌套
@media允许互相嵌套使用，编译时，scss自动添加 and
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@media screen {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.sidebar {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @media (<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">orientation: landscape) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>      width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">500px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
@media screen and (orientation: landscape) {

  .sidebar {

    width: 500px;

  }

}


```
```
使用插值
可以使用变量，函数，以及运算符代替条件的名称或者值。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">media: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">screen;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">feature: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">-webkit-min-device-pixel-ratio;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">value: 1<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.5;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@media #{$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">media} <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">and ($<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">feature: $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">value) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  .sidebar {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">500px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
@media screen and (-webkit-min-device-pixel-ratio: 1.5) {

  .sidebar {

    width: 500px;

  }

}


```
```
@mixin
混合指令（Mixin）用于定义可重复使用的样式。混合指令可以包含所有的css规则，绝大部分 scss规则，甚至可以通过参数功能引入变量，输出多样化的样式。
注意：函数命名和变量命名规则一致。
使用
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@mixin mixin-name() {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/* css 声明 */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>// 使用<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@include mixin-name;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 标准形式

```
// 定义一个区块基本的样式

@mixin block {

    width: 96%;

    margin-left: 2%;

    border-radius: 8px;

    border: 1px #f6f6f6 solid;

}

// 使用混入 

.container {

    .block {

        @include block;

    }

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.block {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">96%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">2%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">8px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f6f6f6 solid;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 嵌入选择器

`@mixin`里面再嵌套一层

```
@mixin warning-text {

    font-size: 12px;

    .warn-text {

        color: rgb(255, 253, 123);

        line-height: 180%;

    }

}



.container {

    @include warning-text;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.warn-text {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#fffd7b;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">line-height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">180%;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 单参数

```
// 定义flex布局元素纵轴的排列方式

@mixin flex-align($aitem) {

    align-items: $aitem;

}



// 只有一个参数，直接传递参数

.container {

    @include flex-align(center);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">align-items: center;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 多参数

```
// 定义块元素内边距

@mixin block-padding($top, $right, $bottom, $left) {

    padding-top: $top;

    padding-right: $right;

    padding-bottom: $bottom;

    padding-left: $left;

}



// 按照参数顺序赋值

.container1 {

   @include block-padding(10px, 20px, 30px, 40px);

}



// 可指定参数赋值

.container2 {

   @include block-padding($left: 20px, $top: 10px, $bottom: 10px, $right: 30px);

}



// 可指定参数赋值，但是必须指定4个值，不能缺失

.container3 {

   @include block-padding($left: 10px, $top: 10px, $bottom: 0, $right: 0);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-top: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">40px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-top: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-top: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 指定默认值

```
// 定义块元素内边距，参数指定默认值

@mixin block-padding($top:0, $right:0, $bottom:0, $left:0) {

    padding-top: $top;

    padding-right: $right;

    padding-bottom: $bottom;

    padding-left: $left;

}



// 可指定参数赋值

.container {

    /** 不带参数 */

    @include block-padding;

    /** 按顺序指定参数值 */

    @include block-padding(10px,20px);

    /** 给指定参数指定值 */

    @include block-padding($left: 10px, $top: 20px)

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/** 不带参数 */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-top: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/** 按顺序指定参数值 */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-top: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/** 给指定参数指定值 */<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-top: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 可变参数

使用`...`处理参数不固定的情况，类似于`js`中的函数的剩余参数

```
@mixin linear-gradient($direction, $gradients...) {

    background-color: nth($gradients, 1);

    background-image: linear-gradient($direction, $gradients);

}



.table-data {

    @include linear-gradient(to right, #F00, orange, yellow);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.table-data {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#F00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-image: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">linear-gradient(to right, #F00, orange, yellow);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 总结

1. `mixin`是可以重复使用的一组`css`声明，有助于减少重复代码，只需声明一次，就可在文件中引用；
2. 混合指令可以包含所有的 `css`规则，绝大部分`scss`规则，可以传递参数，输出多样化的样式；
3. 使用参数时建议加上默认值；
4. `@import`导入局部模块化样式（类似功能、同一组件）；
5. `@minix`定义的是可重复使用的样式


@function
---------

`@function`用于封装复杂的操作，可以很容易地以一种可读的方式抽象出通用公式和行为，函数提供返回值，常用来做计算方面的工作。


### 使用

注意：函数命名和变量命名规则一致。

```
@function square($base) {

    @return $base * $base * 1px;

}



.sidebar {

    float: left;

    margin-left: square(4);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.sidebar {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">float: left;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-left: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">16px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 可选参数

默认值可以是任何表达式，它们甚至可以引用前面的参数！

```
//change-color和hue是内置方法

//hue 返回$color的颜色为0到360度之间的一个数字。

//change-color 用于设置颜色的属性

@function invert($color, $amount: 100%) {

    //@error hue($color); 调试 210deg

    $inverse: change-color($color, $hue: hue($color) + 180);

    @return mix($inverse, $color, $amount);

}



$primary-color: #036;

.header {

    background-color: invert($primary-color, 80%);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.header {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#523314;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 指定参数

```
$primary-color: #036;

.banner {

    //scale-color Fluidly scales one or more properties of .$color

    background-color: $primary-color;

    color: scale-color($primary-color, $lightness: +40%);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.banner {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#036;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#0a85ff;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 可变参数

参数列表还可用于采用任意关键字参数，`meta.keywords()`函数采用参数列表

```
@function sum($numbers...) {

    $sum: 0;

    @each $number in $numbers {

        $sum: $sum + $number;

    }

    @return $sum;

}



$widths: 50px, 30px, 100px;

.micro {

    width: sum($widths...);

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.micro {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">180px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### @return

`@return`只允许在`@function`内使用，和`js`一样，遇到`return`就会返回。

```
@function red() {

    $is: true;

    @if $is {

        @return 'is';

    }

    @return red;

}

.con{

    color: red();

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.con {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"is";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

总结：
`@function`和`@mixin`参数的使用方式没啥区别；
`@function`用来计算，`@mixin`用来封装样式，`@import`用来抽离他们为一个模块。


@extend继承
---------


### 使用

我们以`elementUI`的`el-button`组件为例，可以使用`@extend`继承已经存在的样式，原理是使用逗号选择器。

```
// # id选择器一样的

.button {

    display: inline-block;

    margin-bottom: 0;

    font-weight: normal;

    text-align: center;

    white-space: nowrap;

    vertical-align: middle;

    cursor: pointer;

    background-image: none;

    border: 1px solid transparent;

    padding: 6px 12px;

    font-size: 14px;

    line-height: 1.42857143;

    border-radius: 4px;

    user-select: none;

}



.btn-default {

    @extend .button;

    color: #333;

    background-color: #fff;

    border-color: #ccc;

}



.btn-danger {

    @extend .button;

    color: #fff;

    background-color: #d9534f;

    border-color: #d43f3a;

}


```
```
编译成
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-danger, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-default {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">display: inline-block;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-weight: normal;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">text-align: center;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">white-space: nowrap;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">vertical-align: middle;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">cursor: pointer;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-image: none;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px solid transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">6px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">14px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">line-height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1.42857143;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">4px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">user-select: none;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-default {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#333;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#fff;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#ccc;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#fff;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#d9534f;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#d43f3a;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 可以使用多个@extend

```
.alert {

    padding: 15px;

    margin-bottom: 20px;

    border: 1px solid transparent;

    border-radius: 4px;

    font-size: 12px;

}



.important {

    font-weight: bold;

    font-size: 14px;

}

.alert-danger {

    @extend .alert;

    @extend .important;

    color: #a94442;

    background-color: #f2dede;

    border-color: #ebccd1;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">15px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px solid transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">4px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.important, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-weight: bold;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">14px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#a94442;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f2dede;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#ebccd1;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 多层继承

`@extend`可以多层继承，列如：`.alert-danger`继承自`.important`，`.important`又继承自`.alert`。

```
.alert {

    padding: 15px;

    margin-bottom: 20px;

    border: 1px solid transparent;

    border-radius: 4px;

    font-size: 12px;

}



.important {

    @extend .alert;

    font-weight: bold;

    font-size: 14px;

}

.alert-danger {

    @extend .important;

    color: #a94442;

    background-color: #f2dede;

    border-color: #ebccd1;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.important, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">15px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px solid transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">4px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.important, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-weight: bold;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">14px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.alert-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#a94442;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f2dede;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#ebccd1;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 占位符选择器

占位符选择器`%`，与常用的`id` 与 `class`选择器写法相似，只是 `#` 或 `.` 替换成了`%`，占位符选择器必须通过 `@extend` 指令调用。
还是上面的例子，这里使用占位符选择器操作

```
.button %base {

    display: inline-block;

    margin-bottom: 0;

    font-weight: normal;

    text-align: center;

    white-space: nowrap;

    vertical-align: middle;

    cursor: pointer;

    background-image: none;

    border: 1px solid transparent;

    padding: 6px 12px;

    font-size: 14px;

    line-height: 1.42857143;

    border-radius: 4px;

    user-select: none;

}

        

.btn-default {

    @extend %base;

    color: #333;

    background-color: #fff;

    border-color: #ccc;

}



.btn-danger {

    @extend %base;

    color: #fff;

    background-color: #d9534f;

    border-color: #d43f3a;

}


```
```
效果和上面的类选择器一样，但是，他有个有优点，占位符选择器%所属的样式未使用时，不会被编译到css文件中，算是一个小优化吧。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-danger, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-default {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">display: inline-block;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">margin-bottom: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-weight: normal;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">text-align: center;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">white-space: nowrap;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">vertical-align: middle;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">cursor: pointer;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-image: none;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px solid transparent;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">6px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">14px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">line-height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1.42857143;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">4px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">user-select: none;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-default {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#333;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#fff;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#ccc;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.btn-danger {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#fff;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#d9534f;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#d43f3a;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


@use
----

存在兼容性问题，仅在`Dart Sass 1.23.0`以上有效，官方文档有兼容性介绍。

`scss`真正意义上的模块化，可以从其它 `scss`样式表中加载`mixin`、`function`和`变量`，并将来自多个样式表的 `css`组合在一起。`scss`还提供了很多内置模块，我们可以通过`@use`使用。


### @import缺点

1. 多处导入，存在样式重复加载。
2. 因为没有命名空间，为了避免撞名，不敢使用简写的 `classname`，因此起名总是需要注意。
3. 没有私有函数的概念，样式完全暴露在使用`import`的地方，这对`ui`库不够友好。


### 使用

*src/\_corners.scss*

```
$radius: 3px;

@mixin rounded {

    border-radius: $radius;

}


```
```
index.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@use <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"src/corners";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @include corners.rounded;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5px + corners.$radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 命名空间

*src/\_corners.scss*

```
$radius: 3px;

@mixin rounded {

    border-radius: $radius;

}


```
```
index.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@use <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"src/corners" as c;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @include c.rounded;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5px + c.$radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
.button {

    border-radius: 3px;

    padding: 8px;

}


```
```
as*
使用as*，那么这一模块就处于全局命名空间。
src/_corners.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">radius: 3<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@mixin rounded {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

*index.scss*

```
@use "src/corners" as *;



.button {

    @include rounded;

    padding: 5px + $radius;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">3px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">8px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 私有模块

使用`scss`可以轻松地定义私有成员，私有成员命名以`-`或开头。

*src/\_corners.scss*

```
$-radius: 3px;



@mixin rounded {

    border-radius: $-radius;

}


```
```
index.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@use <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"src/corners";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @include corners.rounded;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    // <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Error: Private members can<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">'t be accessed from outside their modules<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    padding: 5px + corners.$-radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


@forward
--------

`@forward`语句可以引入另一个模块的所有变量、`mixins`和函数，将它们直接作为当前模块的`API`暴露出去，不会真的在当前模块增加代码。不同于 `@use`， `@forward`不能给变量添加命名空间。


### 用法

注意，此时生成的`bootstrap.css`文件中，是不包含`functions`、`variables`、`mixins`代码的，也不能直接在`bootstrap.scss`文件中使用这些模块。而是需要在另一个文件中 `@import 'bootstrap'`或者 `@use bootstrap`模块，再去使用这些方法。`bootstrap.scss`文件类似于一个传输中转站，把上下游的成员变量无缝连接起来。

```
/* bootstrap.scss */

@forward"functions";

@forward"variables";

@forward"mixins";


```
```
注意，直接写在上游模块的正常的样式仍然会被@forward进来。见下例：
a.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@mixin rounded {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: 100<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">footer {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

*b.scss*

```
$radius: 3px;


```
```
c.scss
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@forward <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@forward <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"b";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

*index.scss*

```
@import "c.scss";



.button {

    @include rounded;

    padding: $radius;

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">footer {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">height: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-radius: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">100px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">3px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### show/ hide

通过控制 `show`和 `hide`，可以决定模块中的哪些成员对引入后的模板可见。对隐藏的变量，在下游文件中不可以使用，相当于模块私有成员。

*c.scss*

```
@forward "a" show rounded;

@forward "b" hide $radius;


```
```
index.css
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"c.scss";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @include rounded;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: $radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>// <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Error: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">Undefined <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">variable. <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 使用as \*号为子模块添加前缀

大多数情况下，一个样式库会存在一个入口文件`index.scss`，然后在`index.scss`中引入其他的子文件。这种结构类似于一个多合一模块。那么，如果要在某一文件中 `@forward`多个子模块，就可以使用`as <prefix>-*`语句，为子模块下的成员自动带上前缀以区分。

*c.scss*

```
@forward "a" as mixin-*;

@forward "b" as var-*;


```
```
index.css
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@import <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"c.scss";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.button {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @include mixin-rounded;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: $var-radius;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

很多内置的方法就是这样使用的，嘿嘿！


@at-root
--------

`@at-root`用来跳出嵌套，在多级嵌套时比较常用，包含`without`和`with`。


### 用法

```
//没有跳出

.parent-1 {

    color:#f00;

    .child {

        width:100px;

    }

}



//单个选择器跳出

.parent-2 {

    color:#f00;

    @at-root .child {

        width:200px;

    }

}



//多个选择器跳出

.parent-3 {

    background:#f00;

    @at-root {

        .child1 {

            width:300px;

        }

        .child2 {

            width:400px;

        }

    }

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent-1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent-1 <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">100px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent-2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">200px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent-3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">300px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">400px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### @without和with

默认`@at-root`只会跳出选择器嵌套，而不能跳出`@media`或`@support`，如果要跳出这两种，则需使用`@at-root (without: media)`或`@at-root (without: support)`，`@at-root`的关键词有四个：

1. `all`表示所有；
2. `rule`表示常规`css`选择器；
3. `media` 表示`media`；
4. `support`表示`support`（`@support`主要是用于检测浏览器是否支持`css`的某个属性）。

我们默认的`@at-root`是`@at-root (without:rule)`

```
/*跳出父级元素嵌套*/

@media print {

    .parent1{

        color:#f00;

        @at-root .child1 {

            width:200px;

        }

    }

}



/*跳出media嵌套，父级有效*/

@media print {

    .parent2{

        color:#f00;

        @at-root (without: media) {

            .child2 {

                width:200px;

            }

        }

    }

}



/*跳出media和父级*/

@media print {

    .parent3{

        color:#f00;

        @at-root (without: all) {

            .child3 {

                width:200px;

            }

        }

    }

}


```
```
编译成
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/*跳出父级元素嵌套*/<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@media print {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">200px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/*跳出media嵌套，父级有效*/<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@media print {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent2 <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">200px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(92, 99, 112);font-style: italic;line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">/*跳出media和父级*/<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@media print {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">width: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">200px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### @at-root与 & 配合使用

```
.child{

    @at-root .parent &{

        color:#f00;

    }

}


```
```
编译成
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.parent <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.child {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#f00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


### 应用于@keyframe

```
.demo {

    animation: motion 3s infinite;

    @at-root {

        @keyframes motion {

        }

    }

}


```
```
编译成
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.demo {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">animation: motion <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">3s infinite;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@keyframes motion {}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


Scss内置扩展
--------

`scss`内置扩展分为`color list map math meta selector string`等，扩展也就是`scss`内置的一些`function`，每个模块下内容比较多，这里用一些常用的进行举例。

内置函数可以使用`@use`模块化引入，也可以直接使用他提供的全局函数名调用，以下两种方式是一样的。

```
@use 'sass:list';

p {

    color: nth($list: red blue green, $n: 2); // blue

    color: list.nth($list: red blue green, $n: 2); // blue

}


```
```
color
scss包含很多操作颜色的函数。例如lighten()与 darken()可用于调亮或调暗颜色，opacify()使颜色透明度减少，transparent()使颜色透明度增加，mix()用来混合两种颜色。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p1 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    // 让颜色变亮<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color:<span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">scale-color(#<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5c7a29, $lightness: +<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30%);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p2 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    // 让颜色变暗<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color:<span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">scale-color(#<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5c7a29, $lightness: -<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">15%);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.p3 {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    // 降低颜色透明度<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color:<span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">scale-color(#<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5c7a29, $alpha: -<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">40%);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
.p1 {

    color: #95c249;

}



.p2 {

    color: #4e6823;

}



.p3 {

    color: rgba(92, 122, 41, 0.6);

}


```
```
String
scss有许多处理字符串的函数，比如向字符串添加引号的quote()、获取字符串长度的string-length()和将内容插入字符串给定位置的string-insert()。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">p {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    &:after {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">quote(这是里面的内容);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">unquote($<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">string: "<span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#F00");<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:str-length("scss学习");<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
p {

    background-color: #F00;

    z-index: 6;

}

p:after {

    content: "这是里面的内容";

}


```
```
Math
数值函数处理数值计算，例如：percentage()将无单元的数值转换为百分比，round()将数字四舍五入为最接近的整数，min()和max()获取几个数字中的最小值或最大值，random()返回一个随机数。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">p {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">abs(-<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">15); // 15<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">ceil(<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5.8); //6<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">max(<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">1, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">6, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">8, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">3); //8<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">opacity: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">random(); // 随机 0-1<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
p {

    z-index: 15;

    z-index: 6;

    z-index: max(5, 1, 6, 8, 3);

    opacity: 0.8636254167;

}


```
```
List
List函数操作List，length()返回列表长度，nth()返回列表中的特定项，join()将两个列表连接在一起，append()在列表末尾添加一个值。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">p {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">length(<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px); //1<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">length(<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">12px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">5px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">8px); //3<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">z-index: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">index(a b c d, c); //3<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">append(<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">20px, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">30px); // 10px 20px 30px<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">nth($list: red blue green, $n: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">2); // blue<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
p {

    z-index: 1;

    z-index: 3;

    z-index: 3;

    padding: 10px 20px 30px;

    color: blue;

}


```
```
Map
Map函数操作Map，map-get()根据键值获取map中的对应值，map-merge()来将两个map合并成一个新的map，map-values()映射中的所有值。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-sizes: ("<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">small": 12<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px, "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">normal": 18<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px, "<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">large": 24<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:(top<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:10px, <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">right<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:20px, <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">bottom<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:10px, <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">left<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:30px);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">p {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-size: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">map-get($font-sizes, <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"normal"); //18px<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @if map-has-key($padding, "right") {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding-right: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">map-get($padding, <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"right");<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    &<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">:after {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">map-keys($font-sizes) + <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">" "+ <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">map-values($padding) + <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
p {

    font-size: 18px;

    padding-right: 20px;

}

p:after {

    content: '"small", "normal", "large" 10px, 20px, 10px, 30px';

}


```
```
selector
选择符相关函数可对选择css进行一些相应的操作，例如：selector-append()可以把一个选择符附加到另一个选择符，selector-unify()将两组选择器合成一个复合选择器。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@use <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">'sass:selector';<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@debug selector.is-superselector(<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a"); // <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">true<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>// 可以直接使用<span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@forward下的前缀<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>@debug selector-append(<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">".disabled"); // <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">a<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.disabled<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@debug selector-extend(<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a.disabled", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">".link"); // <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">a<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.disabled, <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.link<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.disabled<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.header {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">selector-append(<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">".a", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">".b", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">".c") + <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">'';<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">content: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">selector-unify(<span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"a", <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">".disabled") + <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">'';<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

编译为

```
.header {

    content: ".a.b.c";

    content: "a.disabled";

}


```
```
meta
meta提供一个mixin和一些原子级别的function，比如使用meta.calc-args获取方法的参数，meta.calc-name获取方法名。
meta.load-css
meta.load-css($url，$with:())该mixin可以把$url中css样式全部包含进来。注意，$url引入的函数，变量和mixin在 meta.load-css()后的scss中并不能用，它只会返回编译后的css代码。它的第二个参数可以修改使用了!default的变量。
src/corners
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-contrast: <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">false !<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">default;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">code {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#6b717f;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#d2e1dd;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @if $border-contrast {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#dadbdf;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

*index.scss*

```
@use "sass:meta";



body.dark {

    @include meta.load-css("src/corners", $with: ("border-contrast": true));

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">body<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.dark <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">code {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">background-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#6b717f;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#d2e1dd;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">border-color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#dadbdf;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>


#### function

```
@use "sass:meta";



@debug meta.calc-args(calc(100px + 10%)); // unquote("100px + 10%")

@debug meta.calc-args(clamp(50px, var(--width), 1000px)); // 50px, unquote("var(--width)"), 1000px



@debug meta.calc-name(calc(100px + 10%)); // "calc"

@debug meta.calc-name(clamp(50px, var(--width), 1000px)); // "clamp"


```
```
调试相关
@debug
@debug打印表达式的值，方便调试。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">font-sizes: 10<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px + 20<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    $<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">style: (<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#bdc3c7<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    );<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @debug $style;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    @debug $font-sizes;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

![](https://oss-cn-hangzhou.aliyuncs.com/codingsky/cdn/img/2022-04-02/a236a24aa46e449dbdd5c2bd2c2e3781)

### @error

`@error`显示致命错误

```
$colors: (

    blue: #c0392b,

    black: #2980b9

);



@function style-variation($style) {

    @error "Invalid color: '#{$style}'.";

    @if map-has-key($colors, $style) {

        @return map-get($colors, $style);

    }

}



.container {

    color: style-variation(white);

}


```
```

@warn
@warn显示警告性建议，会显示堆栈信息。
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
$<span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">colors: (<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">blue: <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#c0392b,<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(224, 108, 117);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">black: <span style="outline: 0px;max-width: 100%;color: rgb(97, 174, 238);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#2980b9<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>  );<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@function style-variation($style) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@warn <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">"Invalid color: '#{$style}'.";<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@if map-has-key($colors, $style) {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>        <span style="outline: 0px;max-width: 100%;color: rgb(198, 120, 221);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">@return map-get($colors, $style);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    }<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br><span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(230, 192, 123);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">style-variation(white);<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>

![](https://oss-cn-hangzhou.aliyuncs.com/codingsky/cdn/img/2022-04-02/176c809f8efbbd670ff3340168d61653)

### 自检函数

自检相关函数，属于内置扩展`meta`下的方法，`feature-exists()`检查当前`scss`版本是否存在某个特性，`variable-exists()`检查当前作用域中是否存在某个变量，`mixin-exists()`检查某个`mixin`是否存在。自检函数通常用在代码的调试上，返回的是个布尔值。

```
$color:#F00;

@mixin padding($left:0, $top:0, $right:0, $bottom:0) {

    padding: $top $right $bottom $left;

}



.container {

    @if variable-exists(color) {

        color: $color;

    }

    @else {

        content: "$color不存在";

    }

    @if mixin-exists(padding) {

        @include padding($left: 10px, $right: 10px);

    }

}


```
```
编译为
<pre data-tool="mdnice编辑器" style="margin-top: 10px;margin-bottom: 10px;outline: 0px;max-width: 100%;border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="margin-bottom: -7px;outline: 0px;max-width: 100%;display: block;background: url("https://mmbiz.qpic.cn/mmbiz_svg/et9q9FvjBBpUicMKVMtSeQDweUiad3aojmIL7jMCvnQWoSibah8v1Nc2syFtN8SZ1IYTfHibWicdvfDVGZicSnaCD1eekG1ibJOE7v7/640?wx_fmt=svg") 10px 10px / 40px no-repeat rgb(40, 44, 52);height: 30px;width: 557.778px;border-radius: 5px;box-sizing: border-box !important;overflow-wrap: break-word !important;">```
<span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">.container {<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">color: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">#F00;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>    <span style="outline: 0px;max-width: 100%;color: rgb(152, 195, 121);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">padding: <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0 <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">0 <span style="outline: 0px;max-width: 100%;color: rgb(209, 154, 102);line-height: 26px;box-sizing: border-box !important;overflow-wrap: break-word !important;">10px;<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>}<br style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"></br>
        
        

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文章来源：https://mp.weixin.qq.com/s/m6dj8-Zg7W_sLheo4uTo8w