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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ #box {
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+ width: 500px;
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+ height: 1600px;
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+ border: 1px solid #000;
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+ margin: 0 auto;
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+ /* position: relative; */
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+ }
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+ #box div {
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+ width: 200px;
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+ height: 200px;
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+ margin-top: 15px;
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+ }
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+ .box1 {
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+ background: firebrick;
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+ }
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+ .box2 {
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+ background: blue;
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+ /* position: sticky;
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+ top: 20px; */
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+ /* position: static; */
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+ position: fixed;
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+ /* position: relative; */
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+ /* position: absolute; */
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+ top: 100px;
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+ left: 100px;
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+ }
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+ .box3 {
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+ background: plum;
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+ }
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+ .box4 {
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+ background: yellow;
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+ }
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+ .box5 {
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+ background: aqua;
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+ }
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+ .box6 {
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+ background: pink;
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+ }
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+ .box7 {
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+ background: purple;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <!--
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+ 一个网页构成：
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+ 文档流 浮动 定位
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+ position:
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+ 方向：top bottom right left
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+ 1.sticky 粘性定位 常用于吸顶效果 搭配top使用
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+ 2.static 静态定位 对页面不产生任何效果
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+ 3.fixed 固定定位 相对于可视窗口定位 脱离文档流 不占位
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+ 子绝父相
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+ 4.relative 相对定位 相对于自身定于 不脱离文档流 占位
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+ 5.absolute
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+ a.父级未开启定位 自己本身定位 相对于可视窗口定位 脱离文档流 不占位
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+ b.父级开启定位 relative 子集相对于父级进行定位 脱离文档流 不占位
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+ -->
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+ <div id="box">
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+ <div class="box1"></div>
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+ <div class="box2"></div>
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+ <div class="box3"></div>
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+ <div class="box4"></div>
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+ <div class="box5"></div>
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+ <div class="box6"></div>
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+ <div class="box7"></div>
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+ </div>
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+</body>
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+</html>
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