htm,asp,php 禁止页面缓存

htm网页
<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache,must-revalidate">
<metahttp-equiv="expires"content="wed,26feb199708:21:57gmt">
或者<metahttp-equiv="expires"content="0">

asp网页
response.expires=-1
response.expiresabsolute=now()-1
response.cachecontrol="no-cache"

php网页
header("expires:mon,26jul199705:00:00gmt");
header("cache-control:no-cache,must-revalidate");
header("pragma:no-cache");