<![CDATA[把以下代码放在<head></head>之间：]]>
<![CDATA[
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
startday = new Date();
clockStart = startday.getTime();
function initStopwatch() {
var myTime = new Date();
return((myTime.getTime() - clockStart)/1000);
}
function getSecs() {
var tSecs = Math.round(initStopwatch());
var iSecs = tSecs % 60;
var iMins = Math.round((tSecs-30)/60);
var sSecs ="" + ((iSecs > 9) ? iSecs : "0" + iSecs);
var sMins ="" + ((iMins > 9) ? iMins : "0" + iMins);
document.forms[0].timespent.value = sMins+":"+sSecs;
window.setTimeout('getSecs()',1000);
}
// End -->
</script>
]]>
<![CDATA[<body>tag如下设置：]]>
<![CDATA[
<BODY onLoad="window.setTimeout('getSecs()',1)">
]]>
<![CDATA[以下代码放在任意地方：]]>
<![CDATA[
<CENTER>
<FORM>
<input size=5 name=timespent>
</FORM>
</CENTER>
]]>