js页面用时

<script type="text/javascript" language="javascript">
    //计时开始
    var tStart =new Date()
    StarTime_S = tStart.getTime()
</script>

<script type="text/javascript" language="javascript">
    //计时结束
    var tEnd =new Date()
    EndTime_S=tEnd.getTime()
    document.write ("本頁執行時間：" + (EndTime_S-StarTime_S)*0.001 +"秒&nbsp;");
</script>