css预编译器--sass

Sass

Sass 提供了 变量（variables）、嵌套规则（nested rules）、 混合（mixins）、 函数（functions），目前我使用最多的还是变量和嵌套规则，貌似目前css也支持嵌套了，css预编译实际上是为了简化css编写，最终编译后还是css。

@规则

• @use

可以将指定样式表加载到当前位置，这个规则必须放在除 @forward 的之前,但是可以声明变量，利用 as 可以命名。

// foundation/_code.scss code {   padding: .25em;   line-height: 0; } 

// style.scss @use 'foundation/code'; 

// css code {   padding: .25em;   line-height: 0; }  

配置，可以使用 !default 标志定义变量来创建它们 配置。要加载具有配置的模块使用@use <url> with (<variable>: <value>, <variable>: <value>)，配置的值将覆盖 变量的默认值。

// _library.scss $black: #000 !default; $border-radius: 0.25rem !default; $box-shadow: 0 0.5rem 1rem rgba($black, 0.15) !default;  code {   border-radius: $border-radius;   box-shadow: $box-shadow; } 

// style.scss @use 'library' with (   $black: #222,   $border-radius: 0.1rem ); 

// css code {   border-radius: 0.1rem;   box-shadow: 0 0.5rem 1rem rgba(34, 34, 34, 0.15); } 

除了加载scss 、sass 外，还能加载 css，@use 和 @import功能很像，但是有区别，@use意在取代@import

• @forward

当使用@use引入样式的时候，可能存在多个层级的嵌套引入，某一层是可以调用上一层的变量，函数等，但是上上层的变量和函数是不能使用的。@forward就是来解决这个问题，让这些变得可用，在中间层将 @use换成@forward，使用时需要加上命名空间。

// src/_list.scss @mixin list-reset {   margin: 0;   padding: 0;   list-style: none; } 

// bootstrap.scss @forward "src/list"; 

// styles.scss @use "bootstrap";  li {   @include bootstrap.list-reset; } 

bootstrap.scss 这一层这时是不能使用src/_list.scss的list-reset ，因为@forward只是将src/_list.scss 给了 styles.scss,所以 bootstrap.scss 还需要使用@use引入src/_list.scss

// src/_list.scss @mixin list-reset {   margin: 0;   padding: 0;   list-style: none; } 

// bootstrap.scss @forward "src/list"; @use "src/list";  li {   @include list-reset; } 

// styles.scss @use "bootstrap";  li {   @include bootstrap.list-reset; } 

修改前缀：通常使用@forward 时，名称很容易混淆，所以可以添加一个前缀来调用变量混合等 ，@forward "<url>" as <prefix>-*

// src/_list.scss @mixin reset {   margin: 0;   padding: 0;   list-style: none; } 

// bootstrap.scss @forward "src/list" as list-*; 

// styles.scss @use "bootstrap";  li {   @include bootstrap.list-reset; } 

控制可见性：当需要将某个模块变量或混入转发给其它某些模块或不转发给某些模块时可以使用下面的语法

// 不转发 @forward "<url>" hide <members...>  // 转发 @forward "<url>" show <members...> 

更改默认值，与@use一样通过配置，将需要修改默认值的传递过去，再使用@use更改，这里需要注意，@use和@forward 共存时，应先@forward ，因为@forward 可能存在修改变量的操作，先引@use就修改不了了。

// _opinionated.scss @forward 'library' with (   $black: #222 !default,   $border-radius: 0.1rem !default ); 

• @import

官方文档中说明 @use 是@import 的替代，并且会淘汰它，这里就不多赘述了

• @mixin 和 @include

@mixin 和 @include 在后面 **混合（mixins）**中有详细说明

• @function

@function可以定义函数，与 js 函数差不多，可传参，返回最终结果。

@function fibonacci($n) {   $sequence: 0 1;   @for $_ from 1 through $n {     $new: nth($sequence, length($sequence)) + nth($sequence, length($sequence) - 1);     $sequence: append($sequence, $new);   }   @return nth($sequence, length($sequence)); }  .sidebar {   float: left;   margin-left: fibonacci(4) * 1px; } 

• @extend

可以继承使当前选择器继承目标选择器的样式 @extend <selector>

.error {   border: 1px #f00;   background-color: #fdd;    &--serious {     @extend .error;     border-width: 3px;   } } 

@extend 与 @mixin 功能差不多，但是值得注意的是，在需要使用变量配置的时候使用@mixin ，当只有样式时使用@extend 更合适

只有简单的选择器才能扩展。

SCSS的语法 .alert {   @extend .message.info;   //      ^^^^^^^^^^^^^   // 不允许    @extend .main .info;   //      ^^^^^^^^^^^    // 不允许 } 

• @at-root

可以将一个或多个样式规则生成在样式文件根层级上，而不是嵌套在其父选择器中 @at-root@at-root <selector> { ... }

.wrapper {   color: white;   .a{     @at-root .b {       color: red;     }   }   @at-root .c {     color: blue;   } } 

• @error

再写某些公共函数 或者混入时，可以添加@error当传入参数不满足某些值时，给予报错信息，用来快速定位。

@mixin reflexive-position($property, $value) {   @if $property != left and $property != right {         @error " #{$property} $property 只能是 left 或 right.";   }    $left-value: if($property == right, initial, $value);   $right-value: if($property == right, $value, initial);    left: $left-value;   right: $right-value;   [dir=rtl] & {     left: $right-value;     right: $left-value;   } }  .sidebar {   @include reflexive-position(top, 12px); } 

• @warn

再写某些公共函数 或者混入时，可以添加@warn当传入参数或值，这些参数或值时废弃的，给予警告信息。

$known-prefixes: webkit, moz, ms, o;  @mixin prefix($property, $value, $prefixes) {   @each $prefix in $prefixes {     @if not index($known-prefixes, $prefix) {       @warn "Unknown prefix #{$prefix}.";     }      -#{$prefix}-#{$property}: $value;   }   #{$property}: $value; }  .tilt {   // Oops, we typo'd "webkit" as "wekbit"!   @include prefix(transform, rotate(15deg), wekbit ms); } 

• @debug

在开发样式表时查看变量或表达式的值。

@mixin inset-divider-offset($offset, $padding) {   $divider-offset: (2 * $padding) + $offset;   @debug "divider offset: #{$divider-offset}";    margin-left: $divider-offset;   width: calc(100% - #{$divider-offset}); } 

• @if @else @else-if 条件判断。

• @each 为列表每个元素或映射中的每对元素。

• @for 循环。

• @while 循环直到满足某些条件。

内置模块

• sass:color

提供了一系列用于处理颜色的函数和操作。这些函数和操作可以帮助你在 Sass 代码中轻松地创建、修改和操作颜色。具体方法参考官网 sass:color，使用时顶层引入@use 'sass:color';

• sass:list

处理列表（list）数据结构的函数。这些函数允许你执行列表相关的操作，例如获取列表的长度、索引值、切片列表、连接列表等。使用这些函数可以简化列表的处理过程，使 Sass 代码更加简洁和易于维护。具体方法参考官网 sass:list，使用时顶层引入@use 'sass:list';

• sass:map

提供了变量筛选等操作的方法，具体方法参考官网 sass:map，使用时顶层引入@use 'sass:map';

• sass:math

提供了一系列用于执行数学运算的函数和操作。这些功能允许你在 Sass 文件中执行加、减、乘、除、取模、幂运算等基本数学操作。使用 math 模块，你可以轻松地创建动态样式，例如根据不同的屏幕尺寸计算字体大小或边距，或者在颜色处理中执行数学运算。具体方法参考官网 sass:math，使用时顶层引入@use 'sass:math';

1. 四则运算： add($num1, $num2)：执行加法运算。subtract($num1, $num2)：执行减法运算。multiply($num1, $num2)：执行乘法运算。divide($num1, $num2)：执行除法运算。
2. 取模运算： mod($num1, $num2)：返回除法运算的余数。
3. 幂运算： pow($base, $exponent)：返回底数的指数幂。
4. 最大值和最小值： max($list)：返回列表中的最大值。min($list)：返回列表中的最小值。
5. 绝对值和四舍五入： abs($number)：返回数字的绝对值。round($number)：将数字四舍五入到最接近的整数。
6. 随机数： random()：返回一个随机数。
7. 数学函数： ceil($number)：将数字向上取整。floor($number)：将数字向下取整。 percentage($number)：将数字转换为百分比字符串。
8. 列表操作： length($list)：返回列表的长度。nth($list, $index)：返回列表中指定索引处的值。

• sass:meta

提供了一些用于访问和操作 Sass 文件元数据的函数和属性。这些元数据包括文件路径、文件名、行号等信息。具体方法参考官网 sass:list，使用时顶层引入@use 'sass:list';

• sass:selector

提供函数检查和选择器信息的获取的方法，具体方法参考官网 sass:selector，使用时顶层引入@use 'sass:selector';

• sass:string

提供了一系列用于处理字符串的函数和操作。这些功能允许你在 Sass 文件中执行字符串的连接、查找、替换、截取等操作。具体方法参考官网 sass:string，使用时顶层引入@use 'sass:string';

1. 字符串连接： string-append($string1, $string2)：将两个字符串连接在一起。
2. 字符串查找： str-index($string, $substring)：返回子字符串在字符串中的索引位置。
3. 字符串替换： str-insert($string, $index, $insertion)：在指定索引位置插入字符串。str-replace($string, $find, $replace)：替换字符串中的子字符串。
4. 字符串截取： str-slice($string, $start, $end)：截取字符串的一部分。
5. 字符串转换： to-upper-case($string)：将字符串转换为大写。to-lower-case($string)：将字符串转换为小写。
6. 字符串操作： quote($string)：将字符串用引号括起来。unquote($string)：移除字符串的引号。

变量（variables）

• 定义
  利用 $ + 名称 : 值 就可以定义变量， 同样使用也是 $ + 名称

$base-color: #c6538c; $border-dark: rgba($base-color, 0.88);  .alert {   border: 1px solid $border-dark; } 

• 默认值覆盖

当在编写了一个通用样式文件后，希望可以在后续更改通用样式变量的默认值时，可以通过在变量后加 !default 关键字，然后通过 变量@use 规则，来配置覆盖默认值。

@use 可以用来在该样式表中加载其它样式表中的样式

@use 'foundation/code'; 

这里覆盖默认变量值 使用 @use <url> with (<variable>: <value>, <variable>: <value>)的形式，url 为覆盖变量值的文件地址

// index.scss $black: #000 !default; $border-radius: 0.25rem !default; $box-shadow: 0 0.5rem 1rem rgba($black, 0.15) !default;  .code {   background-color: $black;   border-radius: $border-radius;   box-shadow: $box-shadow; } 

// use.scss @use "index" with (   $black: red,   $border-radius: 0.1rem ); 

最终编译结果为覆盖后的样式

• 内置变量

sass内置了很多模块，模块内定义的变量是不可以修改的

@use "sass:math" as math;  math.$pi: 0; .content2 {   width: math.$pi; } 

• 应用范围

在样式表顶层声明的变量是全局变量。这意味着 声明后，可以在模块中的任何位置访问它们, 在块内定义的变量在其它模块时访问不到的。

$global-variable: red;  .content {   $local-variable: blue; }  .sidebar {   color: $global-variable;   background: $local-variable; } 

顶层定义和块里边定义变量名称是可以重复的，不会进行覆盖

$global-variable: red;  .content {   $global-variable: blue;   color: $global-variable; }  .sidebar {   color: $global-variable; } 

可以使用!global关键字将块里边变量提升为全局变量，从2.0.0开始，这个只能作用于全局定义过这个变量的块级变量上，不能在新变量上使用，就是只能做覆盖全局。

$global-variable: red; $local-variable: green; .content {   $local-variable: blue !global;   color: $local-variable; }  .sidebar {   color: $global-variable;   background-color: $local-variable; } 

• 条件控制范围

通过一些条件，或者变量操作控制一些变量的值

$dark-theme: true !default; $primary-color: #f8bbd0 !default; $accent-color: #6a1b9a !default;  @if $dark-theme {   $primary-color: darken($primary-color, 60%);   $accent-color: lighten($accent-color, 60%); }  .button {   background-color: $primary-color;   border: 1px solid $accent-color;   border-radius: 3px; } 

• 高级变量函数

Sass 核心库提供了几个高级功能，用于使用 变量。

• meta.variable-exists() 函数返回变量是否给定名称存在于当前作用域中。

@use "sass:meta";  @debug meta.variable-exists("var1"); // false  $var1: red; @debug meta.variable-exists("var1"); // true  h1 {   // $var2 is local.   $var2: red;   @debug meta.variable-exists("var2"); // true } 

嵌套（nested rules）

嵌套，让css 的层级关系与html的层级关系对应，使css更加清晰，但是过多层级的嵌套会让维护变得困难，并且CSS 所需的带宽以及浏览器所需的工作量就越多。

nav {   ul {     margin: 0;     padding: 0;     list-style: none;   }    li { display: inline-block; }    a {     display: block;     padding: 6px 12px;     text-decoration: none;   } } 

混合（mixins）

Mixins 允许您定义可以在整个样式表中重复使用的样式。它们可以很容易地避免使用非语义类。混合可以包含自身样式，也可以包含其它混合，混合可以是嵌套在其他规则中或包含在样式表的顶层;或者他们 只能用于修改变量。用@mixin和@include配合使用。

@mixin <name> { ... } 或@mixin name(<arguments...>) { ... }来定义混合规则
@include <name>或@include <name>(<arguments...>)来使用
其中arguments表示参数

@mixin reset-list {   margin: 0;   padding: 0;   list-style: none; }  @mixin horizontal-list {   @include reset-list;    li {     display: inline-block;     margin: {       left: -2px;       right: 2em;     }   } }  nav ul {   @include horizontal-list; } 

• 参数

Mixins 还可以接受参数。参数在规则中指定 mixin 的名称，作为用括号括起来的变量名称列表。 然后，mixin 必须以 SassScript 表达式的形式包含在相同数量的参数中。这些表达式的值可在 mixin 的主体作为相应的变量。

@mixin rtl($property, $ltr-value, $rtl-value) {   #{$property}: $ltr-value;    li & {     #{$property}: $rtl-value;   } }  .sidebar {   @include rtl(float, left, right); } 

、

在参数后边跟冒号和值，表示该参数为可选参数，当没有传的时候默认为该值

@mixin replace-text($image, $x: 50%, $y: 50%) {   text-indent: -99999em;   overflow: hidden;   text-align: left;    background: {     image: $image;     repeat: no-repeat;     position: $x $y;   } }  .mail-icon {   @include replace-text(url("/images/mail.svg"), 0); } 

在传参过程中，是可以指定参数名称的

@mixin square($size, $radius: 0) {   width: $size;   height: $size;    @if $radius != 0 {     border-radius: $radius;   } }  .avatar {   @include square(100px, $radius: 4px); } 

也可以接收任意数量的参数，在最后一个参数添加 ...表示参数列表，混合内可以用循环拿到参数

@mixin order($height, $selectors...) {   @for $i from 0 to length($selectors) {     #{nth($selectors, $i + 1)} {       position: absolute;       height: $height;       margin-top: $i * $height;     }   } }  @include order(150px, "input.name", "input.address", "input.zip"); 

使用案例

• 按钮不同状态的颜色变化

按钮在鼠标放入以及鼠标点击时，颜色会淡一点，这个可以用sass中color模块来
实现。

sass代码：

$btnColor: #409eff, #67c23a, #e6a23c, #f56c6c, #909399; @function btnColor($type) {   @return nth($btnColor, $type); // 从颜色序列中获取指定类型的颜色 } @mixin btn($type) {   $color: btnColor($type);   background: $color;   color: #fff;   &:hover {     background: lighten($color, 10%); // 亮度增加10%   }   &:active {         background: darken($color, 10%); // 亮度减少10%   }   &:disabled {     background: lighten($color, 20%); // 亮度增加20%     color: white;   } } .btn {   &.primary {     @include btn(1);   }   &.success {     @include btn(2);   }   &.warning {     @include btn(3);   }   &.danger {     @include btn(4);   } } 

编译后的代码：

.btn.primary {   background: #409eff;   color: #fff; } .btn.primary:hover {   background: #73b8ff; } .btn.primary:active {   background: #0d84ff; } .btn.primary:disabled {   background: #a6d2ff;   color: white; } .btn.success {   background: #67c23a;   color: #fff; } .btn.success:hover {   background: #85cf60; } .btn.success:active {   background: #529b2e; } .btn.success:disabled {   background: #a3db87;   color: white; } .btn.warning {   background: #e6a23c;   color: #fff; } .btn.warning:hover {   background: #ecb869; } .btn.warning:active {   background: #d48a1b; } .btn.warning:disabled {   background: #f2cd96;   color: white; } .btn.danger {   background: #f56c6c;   color: #fff; } .btn.danger:hover {   background: #f89c9c; } .btn.danger:active {   background: #f23c3c; } .btn.danger:disabled {   background: #fbcccc;   color: white; }  /*# sourceMappingURL=index.css.map */  

• 窗口变化文字替换

sass代码:

body{   height: 100vh;   margin: 0;   display: flex;   justify-content: center;   padding-top: 100px;   box-sizing: border-box;   background: #0f0f0f; }  $words : 'Hello', 'World', 'I', 'am', 'Sass', 'CSS', 'Animation', 'Text', 'Replace', 'Effect', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J','K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4','5', '6', '7', '8', '9', '0', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '-', '_', '+', '=', '[', ']', '{', '}', '|', '\\', ':', ';', '"', '\'', '<', '>', ',', '.', '?', '/', '`', '~', '你', '好', '世', '界', '我', '是', 'Sass', 'CSS', '动', '画', '文', '字', '替', '换', '效', '果', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J','K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S','T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4','5', '6', '7', '8', '9', '0', '!', '@','#', '$', '%', '^', '&', '*', '(', ')', '-', '_', '+', '=', '[', ']', '{', '}', '|', '\\', ':',';', '"', '\'', '<', '>', ',', '.', '?', '/', '`', '~', '你', '好', '世', '界', '我', '是', 'Sass','CSS', '动', '画', '文', '字', '替', '换';  $max: 1920px; h1::after{   content: 'A';   color: white;   text-shadow: 1px 1px 4px #333;   text-transform: uppercase;   @each $word in $words{     @media screen and (max-width: $max){       content: $word;     }     $max: $max - 10px;   }  } 

编译后代码：

@charset "UTF-8"; body {   height: 100vh;   margin: 0;   display: flex;   justify-content: center;   padding-top: 100px;   box-sizing: border-box;   background: #0f0f0f; }  h1::after {   content: "A";   color: white;   text-shadow: 1px 1px 4px #333;   text-transform: uppercase; } @media screen and (max-width: 1920px) {   h1::after {     content: "Hello";   } } @media screen and (max-width: 1910px) {   h1::after {     content: "World";   } } @media screen and (max-width: 1900px) {   h1::after {     content: "I";   } } @media screen and (max-width: 1890px) {   h1::after {     content: "am";   } } @media screen and (max-width: 1880px) {   h1::after {     content: "Sass";   } } @media screen and (max-width: 1870px) {   h1::after {     content: "CSS";   } } @media screen and (max-width: 1860px) {   h1::after {     content: "Animation";   } } @media screen and (max-width: 1850px) {   h1::after {     content: "Text";   } } @media screen and (max-width: 1840px) {   h1::after {     content: "Replace";   } } @media screen and (max-width: 1830px) {   h1::after {     content: "Effect";   } } @media screen and (max-width: 1820px) {   h1::after {     content: "A";   } } @media screen and (max-width: 1810px) {   h1::after {     content: "B";   } } @media screen and (max-width: 1800px) {   h1::after {     content: "C";   } } @media screen and (max-width: 1790px) {   h1::after {     content: "D";   } } @media screen and (max-width: 1780px) {   h1::after {     content: "E";   } } @media screen and (max-width: 1770px) {   h1::after {     content: "F";   } } @media screen and (max-width: 1760px) {   h1::after {     content: "G";   } } @media screen and (max-width: 1750px) {   h1::after {     content: "H";   } } @media screen and (max-width: 1740px) {   h1::after {     content: "I";   } } @media screen and (max-width: 1730px) {   h1::after {     content: "J";   } } @media screen and (max-width: 1720px) {   h1::after {     content: "K";   } } @media screen and (max-width: 1710px) {   h1::after {     content: "L"; 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  } } @media screen and (max-width: 1440px) {   h1::after {     content: "#";   } } @media screen and (max-width: 1430px) {   h1::after {     content: "$";   } } @media screen and (max-width: 1420px) {   h1::after {     content: "%";   } } @media screen and (max-width: 1410px) {   h1::after {     content: "^";   } } @media screen and (max-width: 1400px) {   h1::after {     content: "&";   } } @media screen and (max-width: 1390px) {   h1::after {     content: "*";   } } @media screen and (max-width: 1380px) {   h1::after {     content: "(";   } } @media screen and (max-width: 1370px) {   h1::after {     content: ")";   } } @media screen and (max-width: 1360px) {   h1::after {     content: "-";   } } @media screen and (max-width: 1350px) {   h1::after {     content: "_";   } } @media screen and (max-width: 1340px) {   h1::after {     content: "+";   } } @media screen and (max-width: 1330px) {   h1::after {     content: "=";   } } @media screen and (max-width: 1320px) {   h1::after {     content: "[";   } } @media screen and (max-width: 1310px) {   h1::after {     content: "]";   } } @media screen and (max-width: 1300px) {   h1::after {     content: "{";   } } @media screen and (max-width: 1290px) {   h1::after {     content: "}";   } } @media screen and (max-width: 1280px) {   h1::after {     content: "|";   } } @media screen and (max-width: 1270px) {   h1::after {     content: "\\";   } } @media screen and (max-width: 1260px) {   h1::after {     content: ":";   } } @media screen and (max-width: 1250px) {   h1::after {     content: ";";   } } @media screen and (max-width: 1240px) {   h1::after {     content: '"';   } } @media screen and (max-width: 1230px) {   h1::after {     content: "'";   } } @media screen and (max-width: 1220px) {   h1::after {     content: "<";   } } @media screen and (max-width: 1210px) {   h1::after {     content: ">";   } } @media screen and (max-width: 1200px) {   h1::after {     content: ",";   } } @media screen and (max-width: 1190px) {   h1::after {     content: ".";   } } @media screen and (max-width: 1180px) {   h1::after {     content: "?";   } } @media screen and (max-width: 1170px) {   h1::after {     content: "/";   } } @media screen and (max-width: 1160px) {   h1::after {     content: "`";   } } @media screen and (max-width: 1150px) {   h1::after {     content: "~";   } } @media screen and (max-width: 1140px) {   h1::after {     content: "你";   } } @media screen and (max-width: 1130px) {   h1::after {     content: "好";   } } @media screen and (max-width: 1120px) {   h1::after {     content: "世";   } } @media screen and (max-width: 1110px) {   h1::after {     content: "界";   } } @media screen and (max-width: 1100px) {   h1::after {     content: "我";   } } @media screen and (max-width: 1090px) {   h1::after {     content: "是";   } } @media screen and (max-width: 1080px) {   h1::after {     content: "Sass";   } } @media screen and (max-width: 1070px) {   h1::after {     content: "CSS";   } } @media screen and (max-width: 1060px) {   h1::after {     content: "动";   } } @media screen and (max-width: 1050px) {   h1::after {     content: "画";   } } @media screen and (max-width: 1040px) {   h1::after {     content: "文";   } } @media screen and (max-width: 1030px) {   h1::after {     content: "字";   } } @media screen and (max-width: 1020px) {   h1::after {     content: "替";   } } @media screen and (max-width: 1010px) {   h1::after {     content: "换";   } } @media screen and (max-width: 1000px) {   h1::after {     content: "效";   } } @media screen and (max-width: 990px) {   h1::after {     content: "果";   } } @media screen and (max-width: 980px) {   h1::after {     content: "A";   } } @media screen and (max-width: 970px) {   h1::after {     content: "B";   } } @media screen and (max-width: 960px) {   h1::after {     content: "C";   } } @media screen and (max-width: 950px) {   h1::after {     content: "D";   } } @media screen and (max-width: 940px) {   h1::after {     content: "E";   } } @media screen and (max-width: 930px) {   h1::after {     content: "F";   } } @media screen and (max-width: 920px) {   h1::after {     content: "G";   } } @media screen and (max-width: 910px) {   h1::after {     content: "H";   } } @media screen and (max-width: 900px) {   h1::after {     content: "I";   } } @media screen and (max-width: 890px) {   h1::after {     content: "J";   } } @media screen and (max-width: 880px) {   h1::after {     content: "K";   } } @media screen and (max-width: 870px) {   h1::after {     content: "L";   } } @media screen and (max-width: 860px) {   h1::after {     content: "M";   } } @media screen and (max-width: 850px) {   h1::after {     content: "N";   } } @media screen and (max-width: 840px) {   h1::after {     content: "O";   } } @media screen and (max-width: 830px) {   h1::after {     content: "P";   } } @media screen and (max-width: 820px) {   h1::after {     content: "Q";   } } @media screen and (max-width: 810px) {   h1::after {     content: "R";   } } @media screen and (max-width: 800px) {   h1::after {     content: "S";   } } @media screen and (max-width: 790px) {   h1::after {     content: "T";   } } @media screen and (max-width: 780px) {   h1::after {     content: "U";   } } @media screen and (max-width: 770px) {   h1::after {     content: "V";   } } @media screen and (max-width: 760px) {   h1::after {     content: "W";   } } @media screen and (max-width: 750px) {   h1::after {     content: "X";   } } @media screen and (max-width: 740px) {   h1::after {     content: "Y";   } } @media screen and (max-width: 730px) {   h1::after {     content: "Z";   } } @media screen and (max-width: 720px) {   h1::after {     content: "1";   } } @media screen and (max-width: 710px) {   h1::after {     content: "2";   } } @media screen and (max-width: 700px) {   h1::after {     content: "3";   } } @media screen and (max-width: 690px) {   h1::after {     content: "4";   } } @media screen and (max-width: 680px) {   h1::after {     content: "5";   } } @media screen and (max-width: 670px) {   h1::after {     content: "6";   } } @media screen and (max-width: 660px) {   h1::after {     content: "7";   } } @media screen and (max-width: 650px) {   h1::after {     content: "8";   } } @media screen and (max-width: 640px) {   h1::after {     content: "9";   } } @media screen and (max-width: 630px) {   h1::after {     content: "0";   } } @media screen and (max-width: 620px) {   h1::after {     content: "!";   } } @media screen and (max-width: 610px) {   h1::after {     content: "@";   } } @media screen and (max-width: 600px) {   h1::after {     content: "#";   } } @media screen and (max-width: 590px) {   h1::after {     content: "$";   } } @media screen and (max-width: 580px) {   h1::after {     content: "%";   } } @media screen and (max-width: 570px) {   h1::after {     content: "^";   } } @media screen and (max-width: 560px) {   h1::after {     content: "&";   } } @media screen and (max-width: 550px) {   h1::after {     content: "*";   } } @media screen and (max-width: 540px) {   h1::after {     content: "("; 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  } } @media screen and (max-width: 400px) {   h1::after {     content: '"';   } } @media screen and (max-width: 390px) {   h1::after {     content: "'";   } } @media screen and (max-width: 380px) {   h1::after {     content: "<";   } } @media screen and (max-width: 370px) {   h1::after {     content: ">";   } } @media screen and (max-width: 360px) {   h1::after {     content: ",";   } } @media screen and (max-width: 350px) {   h1::after {     content: ".";   } } @media screen and (max-width: 340px) {   h1::after {     content: "?";   } } @media screen and (max-width: 330px) {   h1::after {     content: "/";   } } @media screen and (max-width: 320px) {   h1::after {     content: "`";   } } @media screen and (max-width: 310px) {   h1::after {     content: "~";   } } @media screen and (max-width: 300px) {   h1::after {     content: "你";   } } @media screen and (max-width: 290px) {   h1::after {     content: "好";   } } @media screen and (max-width: 280px) {   h1::after {     content: "世";   } } @media screen and (max-width: 270px) {   h1::after {     content: "界";   } } @media screen and (max-width: 260px) {   h1::after {     content: "我";   } } @media screen and (max-width: 250px) {   h1::after {     content: "是";   } } @media screen and (max-width: 240px) {   h1::after {     content: "Sass";   } } @media screen and (max-width: 230px) {   h1::after {     content: "CSS";   } } @media screen and (max-width: 220px) {   h1::after {     content: "动";   } } @media screen and (max-width: 210px) {   h1::after {     content: "画";   } } @media screen and (max-width: 200px) {   h1::after {     content: "文";   } } @media screen and (max-width: 190px) {   h1::after {     content: "字";   } } @media screen and (max-width: 180px) {   h1::after {     content: "替";   } } @media screen and (max-width: 170px) {   h1::after {     content: "换";   } }  /*# sourceMappingURL=index.css.map */  

• 星空效果

sass代码：

html {   height: 100%;   background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);     overflow: hidden; } .title {     position: absolute;     top: 50%;     left: 50%;     margin: -100px 0 0 -200px;     width: 400px;     height: 200px;     text-align: center;     h1 {         font-size: 50px;         color: #fff;         text-transform: uppercase;         font-family: 'Exo 2', sans-serif;         padding: 0;         margin: 0;         letter-spacing: 5px;         font-weight: 900;         text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);         animation: animate 4s linear infinite;         @for $i from 1 through 10 {         &:nth-child(#{$i}) {             animation-delay: $i * 0.4s;         }         }     } }  //unquote()函数用于将字符串转换为不带引号的字符串,random()函数用于生成随机数 //#用于拼接 @function getShadows($n){   $shadows: '#{random(100)}vw #{random(100)}vh #fff';   @for $i from 2 through $n {     $shadows: '#{$shadows}, #{random(100)}vw #{random(100)}vh #fff';   }   @return unquote($shadows) }  $duration:400s;// 动画持续时间 $count:1000; // 星星数量  @for$i from 1 through 5 {   $duration: floor($duration / 2); // 随着层数增加，动画持续时间减少   $count: floor($count / 2); // 随着层数增加，星星数量减少   .layer#{$i}{ // 生成层     position: fixed;     $size: #{$i}px;     width: $size;     height: $size;     border-radius: 50%;     box-shadow: getShadows($count);     animation: moveup $duration linear infinite;     &::after{ // 在元素之后添加父元素相同的伪元素，让元素在动画结束底部不是空白的，也防止页面抖动       content: '';       position: fixed;       width: inherit;       height: inherit;       left: 0;       top:100vh;       border-radius: inherit;       box-shadow: inherit;     }   } }  @keyframes moveup {   to {     transform: translateY(-100vh);   } }   

编译后代码：

html {   height: 100%;   background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);   overflow: hidden; }  .title {   position: absolute;   top: 50%;   left: 50%;   margin: -100px 0 0 -200px;   width: 400px;   height: 200px;   text-align: center; } .title h1 {   font-size: 50px;   color: #fff;   text-transform: uppercase;   font-family: "Exo 2", sans-serif;   padding: 0;   margin: 0;   letter-spacing: 5px;   font-weight: 900;   text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);   animation: animate 4s linear infinite; } .title h1:nth-child(1) {   animation-delay: 0.4s; } .title h1:nth-child(2) {   animation-delay: 0.8s; } .title h1:nth-child(3) {   animation-delay: 1.2s; } .title h1:nth-child(4) {   animation-delay: 1.6s; } .title h1:nth-child(5) {   animation-delay: 2s; } .title h1:nth-child(6) {   animation-delay: 2.4s; } .title h1:nth-child(7) {   animation-delay: 2.8s; } .title h1:nth-child(8) {   animation-delay: 3.2s; } .title h1:nth-child(9) {   animation-delay: 3.6s; } .title h1:nth-child(10) {   animation-delay: 4s; }  .layer1 {   position: fixed;   width: 1px;   height: 1px;   border-radius: 50%;   box-shadow: 3vw 27vh #fff, 31vw 38vh #fff, 86vw 88vh #fff, 76vw 88vh #fff, 100vw 85vh #fff, 65vw 56vh #fff, 54vw 89vh #fff, 50vw 52vh #fff, 74vw 31vh #fff, 11vw 80vh #fff, 6vw 58vh #fff, 81vw 77vh #fff, 54vw 17vh #fff, 76vw 19vh #fff, 40vw 74vh #fff, 87vw 95vh #fff, 3vw 30vh #fff, 37vw 91vh #fff, 89vw 61vh #fff, 35vw 89vh #fff, 41vw 64vh #fff, 61vw 66vh #fff, 25vw 35vh #fff, 20vw 36vh #fff, 8vw 94vh #fff, 80vw 3vh #fff, 68vw 28vh #fff, 78vw 60vh #fff, 22vw 74vh #fff, 23vw 94vh #fff, 11vw 77vh #fff, 17vw 93vh #fff, 63vw 56vh #fff, 26vw 17vh #fff, 35vw 20vh #fff, 73vw 72vh #fff, 49vw 48vh #fff, 50vw 84vh #fff, 40vw 62vh #fff, 18vw 25vh #fff, 47vw 54vh #fff, 99vw 8vh #fff, 33vw 19vh #fff, 73vw 96vh #fff, 58vw 71vh #fff, 67vw 31vh #fff, 1vw 66vh #fff, 4vw 4vh #fff, 61vw 10vh #fff, 92vw 58vh #fff, 59vw 35vh #fff, 81vw 13vh #fff, 56vw 90vh #fff, 76vw 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