使用媒体查询更改变量

素颜马尾好姑娘i 2023-09-24 18:11 46阅读 0赞

# 使用媒体查询更改变量 #

媒体类型允许你指定文件将如何在不同媒体呈现。该文件可以以不同的方式显示在屏幕上，在纸张上，或听觉浏览器等等。

CSS 变量可以简化媒体查询的方式。 例如，当屏幕小于或大于媒体查询所设置的值，通过改变变量的值，那么应用了变量的元素样式都会得到响应修改。

在media query（媒体查询）声明的:root选择器里，重定义–rabbit-basecolor的值为 white，且重定义–rabbit-background的值为 rgb(198, 250, 241)，然后通过缩放页面来查看是否生效。

**核心代码**

:root {
        
      --rabbit-ear-shadow: pink;
      --rabbit-basecolor: gray;
      --rabbit-skincolor:whitesmoke;
      --rabbit-background:#E2B29F;
    }
    
    @media (max-width: 350px) {
           表示，在小于350px的时候，下列代码均生效。
      :root {
        
        /* 在这行下面修改代码 */
        --rabbit-basecolor: white;
        --rabbit-background:rgb(198, 250, 241);
        /* 在这行上面修改代码 */
      }
    }

**完整代码**

<!DOCTYPE html>
    <html lang="en">
      <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Easter Rabbit</title>
        <style>
          html {
        
            width: 100%;
            height: 100%;
          }
    
          :root {
        
            --rabbit-ear-shadow: pink;
            --rabbit-basecolor: gray;
            --rabbit-skincolor:whitesmoke;
            --rabbit-background:#E2B29F;
          }
    
          @media (max-width: 350px) {
        
            :root {
        
              /* 在这行下面修改代码 */
              --rabbit-basecolor: white;
              --rabbit-background:rgb(198, 250, 241);
              /* 在这行上面修改代码 */
            }
          }	
    
          body {
        
            width: 100%;
            height: 100%;
            background: var(--rabbit-background);
            display: flex;
            justify-content: center;
            align-items: center;
          }
    
    
    
    
          .rabbit {
        
    
    
            position: relative;
          }
    
          .rabbit .rabbit__body {
        
            width: 4em;
            height: 5.6em;
            background: var(--rabbit-skincolor, whitesmoke);
            border-radius: 50% 50% 50% 50%/60% 60% 40% 40%;
            -webkit-transform: rotate(-40deg);
            transform: rotate(-40deg);
            box-shadow: inset -2.3em -2.7em 0 0 var(--rabbit-basecolor);
          }
    
          .rabbit .rabbit__head {
        
            position: absolute;
            width: 4em;
            height: 4.6em;
            top: -2.5em;
            left: -2em;
            background: var(--rabbit-basecolor);
            border-radius: 50% 50% 50% 50%/65% 60% 40% 35%;
            -webkit-transform: rotate(-120deg);
            transform: rotate(-120deg);
            overflow: hidden;
          }
    
          .rabbit .rabbit__head:before {
        
            content: "";
            position: absolute;
            width: 0.65em;
            height: 0.5em;
            top: -0.1em;
            left: 1.8em;
            background: #F97996;
            border-radius: 50% 50% 50% 50%/30% 30% 70% 70%;
            -webkit-transform: rotate(130deg);
            transform: rotate(130deg);
          }
    
          .rabbit .rabbit__head:after {
        
            content: "";
            position: absolute;
            width: 1em;
            height: 1em;
            top: 1.5em;
            left: 1.6em;
            background: #F4F4F4;
            border-radius: 50%;
            box-shadow: inset 0.1em 0.15em 0 0.37em #3D261C;
          }
    
          .rabbit .rabbit__ear {
        
            position: absolute;
            border-radius: 50% 50% 50% 50%/40% 40% 60% 60%;
            -webkit-transform-origin: 50% 100%;
            transform-origin: 50% 100%;
          }
    
          .rabbit .rabbit__ear--left {
        
            width: 2.2em;
            height: 4.7em;
            top: -5.7em;
            left: -0.2em;
            background: var(--rabbit-ear-shadow, #FFF);
            -webkit-transform: rotate(40deg);
            transform: rotate(40deg);
            box-shadow: inset 0.3em -0.4em 0 -0.1em var(--rabbit-basecolor);
            -webkit-animation: ear-left 5s infinite ease-out;
            animation: ear-left 5s infinite ease-out;
          }
    
          .rabbit .rabbit__ear--right {
        
            width: 2em;
            height: 4.7em;
            top: -5.5em;
            left: -0.7em;
            background: var(--rabbit-basecolor);
            -webkit-transform: rotate(10deg);
            transform: rotate(10deg);
            -webkit-animation: ear-right 5s infinite ease-out;
            animation: ear-right 5s infinite ease-out;
          }
    
          .rabbit .rabbit__leg {
        
            position: absolute;
          }
    
          .rabbit .rabbit__leg--one {
        
            width: 0.8em;
            height: 3em;
            top: 2.3em;
            left: 0.2em;
            background: var(--rabbit-basecolor);
            border-radius: 50% 50% 50% 50%/30% 30% 70% 70%;
            -webkit-transform-origin: 50% 0%;
            transform-origin: 50% 0%;
            -webkit-transform: rotate(15deg);
            transform: rotate(15deg);
          }
    
          .rabbit .rabbit__leg--one:before {
        
            content: "";
            position: absolute;
            width: 0.8em;
            height: 0.5em;
            top: 2.6em;
            left: -0.2em;
            background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
              -webkit-transform: rotate(-10deg);
              transform: rotate(-10deg);
              }
    
              .rabbit .rabbit__leg--three {
        
              width: 0.9em;
              height: 3em;
              top: 2.4em;
              left: 0.7em;
              background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/30% 30% 70% 70%;
              -webkit-transform-origin: 50% 0%;
              transform-origin: 50% 0%;
              -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
              }
    
              .rabbit .rabbit__leg--three:before {
        
              content: "";
              position: absolute;
              width: 0.8em;
              height: 0.5em;
              top: 2.6em;
              left: -0.2em;
              background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
              -webkit-transform: rotate(-10deg);
              transform: rotate(-10deg);
              }
    
              .rabbit .rabbit__leg--two {
        
              width: 2.6em;
              height: 3.6em;
              top: 1.7em;
              left: 1.6em;
              background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/50% 50% 50% 50%;
              -webkit-transform-origin: 50% 0%;
              transform-origin: 50% 0%;
              -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
              }
    
              .rabbit .rabbit__leg--two:before {
        
              content: "";
              position: absolute;
              width: 1.6em;
              height: 0.8em;
              top: 3.05em;
              left: 0em;
              background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
              -webkit-transform: rotate(-10deg);
              transform: rotate(-10deg);
              }
    
              .rabbit .rabbit__leg--four {
        
              width: 2.6em;
              height: 3.6em;
              top: 1.8em;
              left: 2.1em;
              background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/50% 50% 50% 50%;
              -webkit-transform-origin: 50% 0%;
              transform-origin: 50% 0%;
              -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
              }
    
              .rabbit .rabbit__leg--four:before {
        
              content: "";
              position: absolute;
              width: 1.6em;
              height: 0.8em;
              top: 3.05em;
              left: 0em;
              background: var(--rabbit-basecolor);
              border-radius: 50% 50% 50% 50%/70% 70% 30% 30%;
              -webkit-transform: rotate(-10deg);
              transform: rotate(-10deg);
              }
    
              .rabbit .rabbit__tail {
        
              position: absolute;
              width: 0.9em;
              height: 0.9em;
              top: 3.7em;
              left: 4em;
              background: var(--rabbit-basecolor);
              -webkit-transform: rotate(25deg);
              transform: rotate(25deg);
              }
    
              .rabbit .rabbit__tail:after, .rabbit .rabbit__tail:before {
        
              content: "";
              position: absolute;
              width: 100%;
              height: 100%;
              background: var(--rabbit-basecolor);
              border-radius: 50%;
              }
    
              .rabbit .rabbit__tail:before {
        
              top: 0;
              left: -50%;
              }
    
              .rabbit .rabbit__tail:after {
        
              top: 50%;
              left: 0;
              }
    
              @-webkit-keyframes ear-left {
        
              0%, 20%, 100% {
        
              -webkit-transform: rotate(40deg);
              transform: rotate(40deg);
              }
    
              10%, 30%, 80% {
        
              -webkit-transform: rotate(45deg);
              transform: rotate(45deg);
              }
    
              90% {
        
              -webkit-transform: rotate(50deg);
              transform: rotate(50deg);
              }
              }
    
              @keyframes ear-left {
        
              0%, 20%, 100% {
        
              -webkit-transform: rotate(40deg);
              transform: rotate(40deg);
              }
    
              10%, 30%, 80% {
        
              -webkit-transform: rotate(45deg);
              transform: rotate(45deg);
              }
    
              90% {
        
              -webkit-transform: rotate(50deg);
              transform: rotate(50deg);
              }
              }
    
              @-webkit-keyframes ear-right {
        
              0%, 20%, 100% {
        
              -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
              }
    
              10%, 30%, 80% {
        
              -webkit-transform: rotate(5deg);
              transform: rotate(5deg);
              }
    
              90% {
        
              -webkit-transform: rotate(0deg);
              transform: rotate(0deg);
              }
              }
    
              @keyframes ear-right {
        
              0%, 20%, 100% {
        
              -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
              }
    
              10%, 30%, 80% {
        
              -webkit-transform: rotate(5deg);
              transform: rotate(5deg);
              }
    
              90% {
        
              -webkit-transform: rotate(0deg);
              transform: rotate(0deg);
              }
              }
              </style>
              </head>
              <body>
              
              <div class="rabbit">
              <div class="rabbit__leg rabbit__leg--one">
              </div>
              <div class="rabbit__leg rabbit__leg--two">
              </div>
              <div class="rabbit__tail">
              </div>
              <div class="rabbit__body">
              </div>
              <div class="rabbit__leg rabbit__leg--three">
              </div>
              <div class="rabbit__leg rabbit__leg--four">
              </div>
              <div class="rabbit__ear rabbit__ear--right">
              </div>
              <div class="rabbit__head">
              </div>
              <div class="rabbit__ear rabbit__ear--left">
              </div>
              </div>
              
              </body>
              </html>