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@@ -0,0 +1,54 @@
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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 div {
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+ width: 200px;
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+ height: 200px;
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+ margin-top:15px;
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+ font-size: 30px;
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+ text-align: center;
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+ line-height: 200px;
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+ border:1px solid #000;
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+ }
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+ .three {
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+ /* position: sticky; */
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+ /* position: static;
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+ top: 40px; */
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+ background-color: #f00;
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+ }
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+ .four {
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+ position: fixed;
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+ bottom: 100px;
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+ left:100px;
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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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+ 为什么会引出定位
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+ 一个网页：
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+ 文档流
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+ 浮动
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+ 定位
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+
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+ position:定位 top left right bottom
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+ 1.sticky 粘性定位 吸顶效果 top 一起使用 不脱离文档流 占位
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+ 2.static 静态定位 不对页面产生影响
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+ 3.fixed 固定定位 脱离文档流 不占位 相对于祖先元素定位
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+ -->
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+ <div class="box">
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+ <div class="one">1</div>
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+ <div class="two">2</div>
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+ <div class="three">3</div>
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+ <div class="four">4</div>
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+ <div class="five">5</div>
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+ <div class="six">6</div>
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+ <div class="seven">7</div>
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+ <div class="ejght">8</div>
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+ </div>
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+</body>
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+</html>
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