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<!doctype html> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> <style> body{ padding:0px; margin:0px; } #wrap{ height:2000px; } .ad{ height:200px; width:50px; background:pink; position:fixed; } .left{ left:0px; } .right{ right:0px; } </style> <script type="text/javascript"> window.onload = function () { var oad = document.getElementsByClassName(‘ad‘); oad[0].style.top = oad[1].style.top = (document.documentElement.clientHeight - oad[0].offsetHeight)/2 + ‘px‘; }; </script> </head> <body> <div id="wrap"> <div class="ad left"></div> <div class="ad right"></div> </div> </body> </html>
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原文地址：http://www.cnblogs.com/mayufo/p/4210172.html
