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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<title>关于弹出层触发时对滚动原理的分析</title>
<style>
html,body{overflow:hidden;}
body{width: 100%;}
*{margin:0;padding: 0;}
.main{width: 100%;height: 400px;background: #000;margin: 100px auto 1000px;color: #fff;font-size: 20px;font-weight: bold;padding-top: 200px;text-align: center}
.modal-bg{position: fixed;top: 0;left: 0;bottom: 0;right: 0;background: rgba(0,0,0,0.5);z-index: 1;}
.modal-content{position: fixed;width: 300px;height: 120px;background: #fff;z-index: 2;left: 50%;top: 50%;margin-top: -60px;margin-left: -150px;}
.modal-body{height: 80px;overflow: auto;}
</style>
<script src="http://apps.bdimg.com/libs/jquery/1.8.2/jquery.min.js"></script>
<script src="index.js"></script>
</head>
<body>
<!--底部内容-->
<div class="main">
底部内容
</div>
<!--弹出层的内容-->
<div class="modal">
<div class="modal-content">
<div class="modal-body" id="modal-body">
<p>222</p><p>222</p><p>222</p><p>222</p><p>222</p><p>222</p>
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<p>222</p><p>222</p><p>222</p><p>222</p><p>222</p><p>222</p>
</div>
<div class="modal-bottom" style="text-align: center">
<button type="button" id="close">关闭弹出层</button>
</div>
</div>
<div class="modal-bg"></div>
</div>
</body>
</html>