代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>简易网页时钟-www.jb200.com</title>
<style>
body,div{margin:0;padding:0;}
body{color:#fff;font:16px/1.5 5fae8f6f96c59ed1;}
#clock{width:300px;text-align:center;background:#1a1a1a;margin:10px auto;padding:20px 0;}
span{color:#000;width:80px;line-height:2;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}
</style>
<script>
window.onload = function ()
{
var oClock = document.getElementById("clock");
var aSpan = oClock.getElementsByTagName("span");
setInterval(getTimes, 1000);
getTimes();
function getTimes ()
{
var oDate = new Date();
var aDate = [oDate.getHours(), oDate.getMinutes(), oDate.getSeconds()];
for (var i in aDate) aSpan[i].innerHTML = format(aDate[i])
}
function format(a)
{
return a.toString().replace(/^(d)$/, "0$1")
}
}
</script>
</head>
<body>
<div id="clock">
<span></span>点<span></span>分<span></span>秒
</div>
</body>
</html>