禁止IE Cache页面
在页面中使用HTML标记：
<HEAD>
<META http-equiv=Pragma content=no-cache>
<META http-equiv=Cache-Control content=no-cache>
<META HTTP-EQUIV=”Expires” CONTENT=”-1″>
CACHE-CONTROL (49) Cache control directives.
PRAGMA (17) Implementation-specific directives that might apply to any recipient along the request/response chain.
EXPIRES (10) Date and time after which the resource should be considered outdated.
HOWTO：防止在 Internet Explorer 中进行缓存
http://support.microsoft.com/kb/234067/zh-cn
