各种环境下清除缓存的方法。

HTML: 

<META HTTP-EQUIV="pragma" CONTENT="no-cache"> 
<META HTTP-EQUIV="Cache-Control" CONTENT="no-store, must-revalidate"> 
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT"> 
<META HTTP-EQUIV="expires" CONTENT="0"> 

ASP： 

response.expires=0 
response.addHeader("pragma","no-cache") 
response.addHeader("Cache-Control","no-store, must-revalidate") 

PHP： 

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); 
header("Cache-Control: no-store, must-revalidate"); 
header("Pragma: no-cache"); 

JSP： 

response.addHeader("Cache-Control", "no-store, must-revalidate"); 
response.addHeader("Expires", "Thu, 01 Jan 1970 00:00:01 GMT");