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em,rem,vw,vh在实例中的演示
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  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>css常用单位em和rem</title>
  8. </head>
  9. <body>
  10.     <header>页眉</header>
  11.     <main>
  12.         <!-- font-size = 16px -->
  13.         <div>Hello</div>
  14.         <!-- font-size = 20px -->
  15.         <div style="font-size:1.25rem">World</div>
  16.         <!-- font-size = 32px -->
  17.         <div style="font-size:2rem">china</div>
  19.         <div class="box">box</div>
  20.     </main>
  21.     <footer>页脚</footer>
  23. </body>
  24. </html>
  25. <style>
  26.     html {
  27.         width: 100vw;
  28.         height: 100vh;
  29.     }
  30.     * {
  31.         margin: 0;
  32.         padding: 0;
  33.         box-sizing: border-box;
  34.     }
  35.     body > * {
  36.         outline: 1px solid;
  37.         background-color: aqua;
  38.     }
  39.     header,footer {
  40.         width: 100vw;
  41.         height: 5vh;
  42.     }
  43.     main {
  44.         background-color: aquamarine;
  45.         width: 100vw;
  46.         margin: 1vh 0;
  47.         /* calc（）运算需要在运算符两边要加空格，乘除法不用加 */
  48.         min-height: calc(100vh - 5vh - 5vh - 2vh);
  49.     }
  50.     .box {
  51.         background-color: bisque;
  52.         width: 50vw;
  53.         height: 50vh;
  54.         border: 2px solid red;
  55.         margin: 5px;
  56.         padding: 10px;
  57.     }
  58. </style>

Correcting teacher：PHPzPHPz

Correction status：qualified

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