【时间格式：12:01:10】
<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>
<html>
<body>
<script type="text/javascript">
var d=new Date()
var weekday=new Array(7)
weekday[0]="星期日"
weekday[1]="星期一"
weekday[2]="星期二"
weekday[3]="星期三"
weekday[4]="星期四"
weekday[5]="星期五"
weekday[6]="星期六"
document.write("今天是" + weekday[d.getDay()])
</script>
</body>
</html>
使用计时事件制作的钟表和 星期简单写法,布布扣,bubuko.com
原文：http://www.cnblogs.com/Snail168/p/3586123.html