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定位和五环
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定位 的本质

  1. 定位属性 position 定位类型分为 静态定位（static） 相对定位(relative);绝对定位(absolute);固定定位(fixed)；

  2. 静态定位：position: static 默认的，也就是文档流定位，元素的显示位置与源码顺序一致。

  3. 相对定位： position relative; 相对该元素在文档流的原始位置进行偏移。占用原先的位置来进行定位。

  4. 绝对定位： position absolute;相对于它的祖先中离它最近的”定位元素”的位置发生偏移。会脱离文档流。

  5. 定位元素：只要这个元素中有position: relative;或者position：absolute;就称为定位元素。position:static 不是定位元素。

利用绝对定位做的五环

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>浮动</title>
  8.     <style>
  9.         * {
  10.             padding: 0;
  11.             margin: 0;
  12.             box-sizing: border-box;
  13.         }
  15.         .box {
  16.             width: 20em;
  17.             height: 20em;
  18.             border: burlywood solid 2em;
  19.             border-radius: 50%;
  20.             position: absolute;
  21.         }
  23.         .box:first-of-type {
  24.             border: #0000ff solid 2em;
  25.         }
  27.         .box:nth-of-type(2) {
  28.             border: #000 solid 2em;
  29.             left: 20em;
  30.         }
  32.         .box:nth-of-type(3) {
  33.             border: #df0808 solid 2em;
  34.             left: 40em;
  35.         }
  37.         .box:nth-last-of-type(2) {
  38.             border: hsl(59, 100%, 50%) solid 2em;
  39.             left: 10em;
  40.             top: 10em;
  41.         }
  43.         .box:nth-last-of-type(1) {
  44.             border: rgb(94, 255, 0) solid 2em;
  45.             left: 30em;
  46.             top: 10em;
  47.         }
  48.     </style>
  49. </head>
  51. <body>
  52.     <div class="box"></div>
  53.     <div class="box"></div>
  54.     <div class="box"></div>
  55.     <div class="box"></div>
  56.     <div class="box"></div>
  57. </body>
  59. </html>
  • 显示效果
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：五球是个不错的练习
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