示例：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>test page</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/go.html?url=css/main.css" />
<script src="./jquery.js"></script>
</head>
<body>
<div class="top"></div>
<div class="wrap">
<div class="tip">浮起来吧</div>
<div class="xia">mmmmmmmmmmmmmmmmmmbbbbbbbbbbbbbbbbbbbbbbb</div>
1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
</div>
<script type="text/javascript"><!DOCTYPE html>
<html>
<head>
<meta c
