绝对定位与固定定位，两者区别

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>定位原理与演示</title>
  </head>
  <body>
    <div class="box paremt">
      <div class="box child one">child-1:相对定位</div>
      <div class="box child two">child-2:绝对定位</div>
      <div class="box child three">child-3:固定定位</div>
    </div>
    <style>
      html {
        height: 2000px;
        border: red solid 2px;
        /* position: relative; */
      }
      body {
        height: 500px;
        border: #000 solid 2px;
        /* position: relative; */
      }
      .box {
        border: 1px solid #000;
      }
      .paremt {
        background-color: pink;
        width: 400px;
        height: 400px;
        /* position: relative; */
      }
      .box.child {
        padding: 20px;
      }
      /* 相对定位relative top向下偏移 left向右偏移 visibility：hidden隐藏 display:noen删除 */
      .box.child.one {
        background-color: yellow;
        position: relative;
        top: 30px;
        left: 30px;
        visibility: hidden;
        display: none;
        /* z-index: -1; */
      }
      /* 绝对定位absolute ：相对于父级（组先级）可定位属性relative 进行定位  只有第一屏展示*/
      .box.child.two {
        background-color: beige;
        position: absolute;
        right: 0px;
        bottom: 0px;
      }
      /* 固定定位fixed ：相对于视口进行定位 多屏展示*/
      .box.child.three {
        background-color: blue;
        position: fixed;
        top: 202px;
      }
    </style>
  </body>
</html>
实例演示绝对定位与固定定位,并分析异同

绝对定位与固定定位，两者区别
