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绝对定位与固定定位的理解
风残念北的博客
Original
307 people have browsed it

1.绝对定位

代码演示

  1. <!DOCTYPE html>
  2. <html lang="en">
  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>Document</title>
  8. </head>
  9. <body>
  10.     <ul>
  11.         <li>item1</li>
  12.         <li class="absolute">item2</li>
  13.     </ul>
  14.     <style>
  15.         * {
  16.             margin: 0;
  17.             padding: 0;
  18.             box-sizing: border-box;
  19.         }
  20.         body {
  21.             border: 3px solid red;
  22.         }
  23.         ul {
  24.             border: 3px solid blue;
  25.             width: 400px;
  26.             height: 400px;
  27.         }
  28.         ul li{
  29.             height: 30px;
  30.             border: 1px solid black;
  31.             list-style: none;
  32.         }
  33.         ul li:first-child {
  34.             background-color: yellow;
  35.         }
  36.         ul li:first-child + * {
  37.             background-color: green;
  38.         }
  39.         ul li.absolute {
  40.             position: absolute;
  41.             top: 200px;
  42.             left: 300px;
  43.         }
  44.     </style>
  45. </body>
  46. </html>

效果演示

2.固定定位

代码演示

  1. <!DOCTYPE html>
  2. <html lang="en">
  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>Document</title>
  8. </head>
  9. <body>
  10.     <div class="box">广告位</div>
  11.     <style>
  12.         body {
  13.             min-height: 2000px;
  14.         }
  15.         .box {
  16.             background-color: green;
  17.             height: 100px;
  18.             width: 150px;
  19.             position: fixed;
  20.             bottom: 10px;
  21.             right: 5px;
  23.         }
  24.     </style>
  25. </body>
  26. </html>

效果展示

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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