<head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"> </script> </head>
<head> <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.0.js"> </script> </head>
jquery CDN
原文：http://www.cnblogs.com/fgb-com/p/4282031.html
