<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>timer</title>
<style type="text/css">
.timetxt{
/* Box-model盒子模型 */
width: 300px;
margin: 0 auto;
margin-top: 150px;
/* Typography排版 */
font-size: 80px;
font-weight: blod;
}
</style>
</head>
<body onload="startTime()">
<div class="timetxt" id="timetxt"></div>
</body>
<script type="text/javascript">
function startTime(){
var today = new Date();
var h = today.getHours();
var m = today.getMinutes();
var s = today.getSeconds();
m = checkTime(m);
s = checkTime(s);
document.getElementById(‘timetxt‘).innerHTML = h+‘:‘+m+‘:‘+s;
t = setTimeout(startTime,1000);
}
function checkTime(i){
if (i<10) {
i = ‘0‘+i;
}
return i;
}
</script>
</html>
原文：http://11254167.blog.51cto.com/11244167/1784960