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  • scss学习笔记

    1、引用父选择符: &

    #main {
      color: black;
      a {
        font-weight: bold;
        &:hover { color: red; }
      }
    }
    

      

    2、font:2px/3px 代表 字体大小2px 且 line-height:3px

    .funky {
      font: 2px/3px {
        family: fantasy;
        size: 30em;
        weight: bold;
      }
    }
    

      

     3、Placeholder Selectors: %foo

    //如果没有找到%extreme,就不会编译出东西
    #context a%extreme {
      color: blue;
      font-weight: bold;
      font-size: 2em;
    }
    //。notice 或者#notice 都可以接受
    .notice {
      @extend %extreme;
    }
    
    // ---------编译为-------
    #context a.notice {
      color: blue;
      font-weight: bold;
      font-size: 2em; }
    

      

    4、Variables: $

      

    $ 5em;
    
    》》》》》》》》》》》
    #main {
       $width;
    }
    
    
    /*
      SassScript 支持六种主要的数据类型:
    
      数字(例如 1.2、13、10px)
      文本字符串,无论是否有引号(例如 "foo"、'bar'、baz)
      颜色(例如 blue、#04a3f9、rgba(255, 0, 0, 0.5))
      布尔值(例如 true、false)
      空值(例如 null)
      值列表,用空格或逗号分隔(例如 1.5em 1em 0 2em、Helvetica, Arial, sans-serif)
    */
    
    字符串
      虽然说可以接受“”或没有引号,但在编译#{}时,就例外,这要注意
    
    @mixin firefox-message($selector) {
      body.firefox #{$selector}:before {
        content: "Hi, Firefox users!";
      }
    }
    
    @include firefox-message(".header");
    
    》》》》》》》》》》》》》》
    body.firefox .header:before {
      content: "Hi, Firefox users!"; }
    
    如果没有给引号,就error,因为.header 是class,而文本都是string,这就是要注意的
    

      

    5、Interpolation: #{}

      

    $name: foo;
    $attr: border;
    p.#{$name} {
      #{$attr}-color: blue;
    }
    
    //--------------------------------
    
    p.foo {
      border-color: blue; }

    p {
      $font-size: 12px;
      $line-height: 30px;
      font: #{$font-size}/#{$line-height};
    }
    
    // -----------------------------------
    
    p {
      font: 12px/30px; }
    

      

     

    6、变量默认值: !default

      你可以在变量尚未赋值前,通过在值的末尾处添加 !default 标记来为其指定。 也就是说,如果该变量已经被赋值, 就不会再次赋值, 但是,如果还没有被赋值,就会被指定一个值。

      

    $content: "First content";
    $content: "Second content?" !default;
    $new_content: "First time reference" !default;
    
    #main {
      content: $content;
      new-content: $new_content;
    }
    
    //-------------------------------------------------------------
    #main {
      content: "First content";
      new-content: "First time reference"; }
    

      

    7、 @import  可 引入多个  @import "rounded-corners", "text-shadow";

      

    嵌套 @import
    For example, if example.scss contains
    
    .example {
      color: red;
    }
    
    then
    
    #main {
      @import "example";
    }
    
    --------------------------------------------
    #main .example {
      color: red;
    }
    

      

    8 、 @media 媒体查询

    .sidebar {
       300px;
      @media screen and (orientation: landscape) {
         500px;
      }
    }
    
    
    
    //----------------------------------------------------------
    
    @media screen and (-webkit-min-device-pixel-ratio: 1.5) {
      .sidebar {
         500px; } }
    

      

    9、@extend

      

    .error {
      border: 1px #f00;
      background-color: #fdd;
    }
    .seriousError {
      @extend .error;
      border- 3px;
    }
    
    //-----------------------------------------
    
    .error, .seriousError {
      border: 1px #f00;
      background-color: #fdd;
    }
    
    .seriousError {
      border- 3px;
    }
    
    
    //------------------------------exp 2------------
    .error {
      border: 1px #f00;
      background-color: #fdd;
    }
    .error.intrusion {
      background-image: url("/image/hacked.png");
    }
    .seriousError {
      @extend .error;
      border- 3px;
    }
    //-----------------------------------------------
    
    .error, .seriousError {
      border: 1px #f00;
      background-color: #fdd; }
    
    .error.intrusion, .seriousError.intrusion {
      background-image: url("/image/hacked.png"); }
    
    .seriousError {
      border- 3px; }

    // exp 3
    
    .hoverlink {
      @extend a:hover;
    }
    .comment a.user:hover {
      font-weight: bold;
    }
    
    // ---------------------------------------------
    
    .comment a.user:hover, .comment .user.hoverlink {
      font-weight: bold; }
    

      

      

    .error {
      border: 1px #f00;
      background-color: #fdd;
    }
    .attention {
      font-size: 3em;
      background-color: #ff0;
    }
    .seriousError {
      @extend .error;
      @extend .attention;
      border- 3px;
    }
    

      

      

    10、@if

      

    p {
      @if 1 + 1 == 2 { border: 1px solid;  }
      @if 5 < 3      { border: 2px dotted; }
      @if null       { border: 3px double; }
    }
    》》》》
    p {
      border: 1px solid; }
    
    ----
    
    $type: monster;
    p {
      @if $type == ocean {
        color: blue;
      } @else if $type == matador {
        color: red;
      } @else if $type == monster {
        color: green;
      } @else {
        color: black;
      }
    }
    》》》》
    p {
      color: green; }
    

      

    11、@for

      

    @for $i from 1 through 3 {
      .item-#{$i} {  2em * $i; }
    }
    》》》》
    .item-1 {
       2em; }
    .item-2 {
       4em; }
    .item-3 {
       6em; }
    

      

    12、@each

       

    @each $animal in puma, sea-slug, egret, salamander {
      .#{$animal}-icon {
        background-image: url('/images/#{$animal}.png');
      }
    }
    》》》》
    .puma-icon {
      background-image: url('/images/puma.png'); }
    .sea-slug-icon {
      background-image: url('/images/sea-slug.png'); }
    .egret-icon {
      background-image: url('/images/egret.png'); }
    .salamander-icon {
      background-image: url('/images/salamander.png'); }
    

      

    13、@while

      

    $i: 6;
    @while $i > 0 {
      .item-#{$i} {  2em * $i; }
      $i: $i - 2;
    }
    》》》》
    .item-6 {
       12em; }
    
    .item-4 {
       8em; }
    
    .item-2 {
       4em; }
    

      

    14、Mixin Directives

    @mixin large-text {
      font: {
        family: Arial;
        size: 20px;
        weight: bold;
      }
      color: #ff0000;
    }
    .page-title {
      @include large-text;
      padding: 4px;
      margin-top: 10px;
    }
    》》》》
    .page-title {
      font-family: Arial;
      font-size: 20px;
      font-weight: bold;
      color: #ff0000;
      padding: 4px;
      margin-top: 10px; }
    

      

    @mixin silly-links {
      a {
        color: blue;
        background-color: red;
      }
    }
    
    @include silly-links;
    》》》》
    a {
      color: blue;
      background-color: red; }
    

      

    15、Arguments

    @mixin sexy-border($color, $width) {
      border: {
        color: $color;
         $width;
        style: dashed;
      }
    }
    
    p { @include sexy-border(blue, 1in); }
    》》》》
    p {
      border-color: blue;
      border- 1in;
      border-style: dashed; }
    

      

    @mixin box-shadow($shadows...) {
      -moz-box-shadow: $shadows;
      -webkit-box-shadow: $shadows;
      box-shadow: $shadows;
    }
    
    .shadows {
      @include box-shadow(0px 4px 5px #666, 2px 6px 10px #999);
    }
    》》》》
    .shadows {
      -moz-box-shadow: 0px 4px 5px #666, 2px 6px 10px #999;
      -webkit-box-shadow: 0px 4px 5px #666, 2px 6px 10px #999;
      box-shadow: 0px 4px 5px #666, 2px 6px 10px #999;
    }
    

      

    @mixin colors($text, $background, $border) {
      color: $text;
      background-color: $background;
      border-color: $border;
    }
    
    $values: #ff0000, #00ff00, #0000ff;
    .primary {
      @include colors($values...);
    }
    》》》》
    .primary {
      color: #ff0000;
      background-color: #00ff00;
      border-color: #0000ff;
    }
    

      

    Passing Content Blocks to a Mixin

    @mixin apply-to-ie6-only {
      * html {
        @content;
      }
    }
    @include apply-to-ie6-only {
      #logo {
        background-image: url(/logo.gif);
      }
    }
    》》》》
    * html #logo {
      background-image: url(/logo.gif);
    }
    

      

    $color: white;
    @mixin colors($color: blue) {
      background-color: $color;
      @content;
      border-color: $color;
    }
    .colors {
      @include colors { color: $color; }
    }
    》》》》
    .colors {
      background-color: blue;
      color: white;
      border-color: blue;
    }
    

      

    16、Function Directives

    $grid- 40px;
    $gutter- 10px;
    
    @function grid-width($n) {
      @return $n * $grid-width + ($n - 1) * $gutter-width;
    }
    
    #sidebar {  grid-width(5); }
    //#sidebar {  grid-width($n: 5); }
    >>>>
    #sidebar {
       240px; }

      

     

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  • 原文地址:https://www.cnblogs.com/Mvloveyouforever/p/8334616.html
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