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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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