解决ie6下不支持fix属性，模拟固定定位

 1 <!DOCTYPE HTML>
 2 <html>
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 5 <title>模拟固定定位fix</title>
 6 <style>
 7 html{ height:100%; overflow:hidden;}
 8 body{margin:0;  height:100%; overflow:auto;}
 9 .box{height:2000px;}
10 .div{width:100px;height:100px;background:red; position:absolute;left:100px;top:100px;}
11 </style>
12 </head>
13 <body>
14 <div class="box">
15     <div class="div"></div>
16 </div>
17 </body>
18 </html>

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