编辑您的代码：
<html>
<head>
<script type="text/javascript">
function startTime()
{
var today=new Date()
var h=today.getHours()
var m=today.getMinutes()
var s=today.getSeconds()
// add a zero in front of numbers<10
m=checkTime(m)
s=checkTime(s)
document.getElementById(‘txt‘).innerHTML=h+":"+m+":"+s
t=setTimeout(‘startTime()‘,500) }
function checkTime(i) {
if (i<10)
{
i="0" + i
}
return i
}
</script>
</head>
<body onload="startTime()">
<div id="txt"></div>
</body>
</html>
查看结果:
00:00:00
原文：http://www.cnblogs.com/zifashaonian10000/p/4221755.html