iframe width=0 height=0 src="/blog/SessionKeeper.asp">/iframe>

html>
head>
meta http-equiv="Refresh" content="900000;url=sessionKeeper.asp">
!--每隔900秒刷新一下自己，為了和服務(wù)器通訊一下，保持session不會(huì)丟-->
/head>
/html>

script id=Back language=javascript>/script>
script language=javascript>
function keepsession(){
document.all["Back"].src="/blog/SessionKeeper.asp?RandStr="+Math.random();
//這里的RandStr=Math.random只是為了讓每次back.src的值不同，防止同一地址刷新無效的情況
window.setTimeout("keepsession()",900000); //每隔900秒調(diào)用一下本身
}
keepsession();
/script>