（转自：http://www.cnblogs.com/Wenwang/archive/2011/09/21/2184102.html）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type="text/css">
#clock{
width: 200px;
height: 200px;
border: 1px solid black;
border-radius: 100px;
position:relative;
margin:0 auto;
background-color:#eee;
}
#dot{
border-radius:2px;
width: 8px;
height: 8px;
position:absolute;
top: 0;
bottom: 0;
margin: auto;
left: 0;
right: 0;
background: black;
}
.needle
{
-ms-transform-origin: 50% 100%;
-webkit-transform-origin: 50% 100%;
-moz-transform-origin: 50% 100%;
-o-transform-origin: 50% 100%;
transform-origin:50% 100%;
}
#second{
position:relative;
z-index:5;
height: 80px;
width: 1px;
margin: 20px auto;
}
#second_needle{
height: 100%;
width: 100%;
position: relative;
background: green;
}
#minute{
z-index:4;
height: 60px;
width: 4px;
position: absolute;
top: 40px;
left: 0px;
right: 0px;
margin: auto;
}
#minute_needle{
height: 100%;
width: 100%;
background: blue;
}
#hour{
z-index:3;
height: 40px;
width: 8px;
position: absolute;
top: 60px;
left: 0px;
right: 0px;
margin: auto;
}
#hour_needle{
height: 100%;
width: 100%;
background: red;
}
</style>
</head>
<body>
<div id="clock">
<div id="dot"></div>
<div id="second" class="needle">
<div id="second_needle">
</div>
</div>
<div id="minute" class="needle">
<div id="minute_needle">
</div>
</div>
<div id="hour" class="needle">
<div id="hour_needle">
</div>
</div>
</div>
<script type="text/javascript">
//初始化各指钟的位置
window.onload = function(){
var date = new Date(),
second = date.getSeconds(),
minute = date.getMinutes(),
minuteDeg,
hour = date.getHours(),
hourDeg;
var secondrotate = 'rotate('+second*6+'deg)';
var scss = '-moz-transform:' + secondrotate + ';-o-transform:' + secondrotate + ';-ms-transform:' + secondrotate;
//对?于úwebkit的?浏ˉ览à器÷,要a这a样ù定¨义?
document.getElementById('second').style.cssText = scss;
document.getElementById('second').style.webkitTransform = secondrotate;
minuteDeg = minute*6 + second*6/60;
var minuterotate = 'rotate('+minuteDeg+'deg)';
var minutecss = '-moz-transform:' + minuterotate + ';-o-transform:' + minuterotate + ';-ms-transform:' + minuterotate ;
document.getElementById('minute').style.cssText = minutecss;
document.getElementById('minute').style.webkitTransform = minuterotate; //对?于úwebkit的?浏ˉ览à器÷,要a这a样ù定¨义?
if(hour>12){
hour = hour -12;
}
hourDeg = hour * 30 + minute*30/60;
var hourtrotate = 'rotate('+hourDeg+'deg)';
var hcss = '-moz-transform:' + hourtrotate + ';-o-transform:' + hourtrotate + ';-ms-transform:' + hourtrotate;
document.getElementById('hour').style.cssText = hcss;
document.getElementById('hour').style.webkitTransform = hourtrotate; //对?于úwebkit的?浏ˉ览à器÷,要a这a样ù定¨义?
};
//周ü期ú性?改?变?秒?钟ó的?位?置?
setInterval(function(){
var date = new Date(),
second = date.getSeconds();
var secondrotate = 'rotate('+second*6+'deg)';
var scss = '-moz-transform:' + secondrotate + ';-o-transform:' + secondrotate + ';-ms-transform:' + secondrotate ;
document.getElementById('second').style.cssText = scss;
document.getElementById('second').style.webkitTransform = secondrotate; //对?于úwebkit的?浏ˉ览à器÷,要a这a样ù定¨义?
},1000)
//周ü期ú性?改?变?分?钟ó的?位?置?
setInterval(function(){
var date = new Date(),
second = date.getSeconds(),
minute = date.getMinutes(),
minuteDeg;
minuteDeg = minute*6 + second*6/60;
var minuterotate = 'rotate('+minuteDeg+'deg)';
var minutecss = '-moz-transform:' + minuterotate + ';-o-transform:' + minuterotate + ';-ms-transform:' + minuterotate ;
document.getElementById('minute').style.cssText = minutecss;
document.getElementById('minute').style.webkitTransform = minuterotate; //对?于úwebkit的?浏ˉ览à器÷,要a这a样ù定¨义?
},6000)
//周ü期ú性?改?变?时±钟ó的?位?置?
setInterval(function(){
var date = new Date(),
second = date.getSeconds(),
minute = date.getMinutes(),
hour = date.getHours(),
hourDeg;
if(hour>12){
hour = hour -12;
}
hourDeg = hour * 30 + minute*30/60;
var hourtrotate = 'rotate('+hourDeg+'deg)';
var hcss = '-moz-transform:' + hourtrotate + ';-o-transform:' + hourtrotate + ';-ms-transform:' + hourtrotate;
document.getElementById('hour').style.cssText = hcss;
document.getElementById('hour').style.webkitTransform = hourtrotate; //对?于úwebkit的?浏ˉ览à器÷,要a这a样ù定¨义?
},360000)
</script>
</body>
</html>