JavaScript 实现网页实时时钟与星期显示

 
<html>
<head>
<script type="text/javascript">
function startTime()
{ 
var today=new Date()
var h=today.getHours()
var m=today.getMinutes()
var s=today.getSeconds()
// 对小于10的数字前面补零
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>

 
<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>