<body onload=jishi() onunload=likai()>
<script language=javascript>
<!--
function jishi(){
OpenTime=new Date()
}
function likai(){
CloseTime=new Date()
staytime=(CloseTime.getTime() - OpenTime.getTime())
miaoshu=Math.round(staytime / 1000);
alert(miaoshu+'秒')
//-->
}
</script>
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