<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
.box{
width: 600px;
height: 600px;
margin: 0 auto;
background: url(img/clock.jpg);
position: relative;
}
#hour{
width: 100%;
height: 600px; /*盒子大小必须的写*/
background: url(img/hour.png) no-repeat center center;
position: absolute;
}
#min{
width: 100%;
height: 100%;
background: url(img/minute.png) no-repeat center center;
position: absolute;
}
#second{
width: 100%;
height: 100%;
background: url(img/second.png) no-repeat center center;
position: absolute;
}
</style>
<script type="text/javascript">
window.onload = function(){
var hour = document.getElementById('hour');
var min = document.getElementById('min');
var second = document.getElementById('second');
setInterval(function(){
var date = new Date();
var s=0,m=0,h=0,ms=0;
ms= date.getMilliseconds();
s= date.getSeconds()+ms/1000;
m = date.getMinutes()+s/60;
h = date.getHours()%12+m/60;
second.style.webkitTransform = 'rotate('+6*s+'deg)';
min.style.webkitTransform = 'rotate('+6*m+'deg)';
hour.style.webkitTransform = 'rotate('+30*h+'deg)';
},1000);
}
</script>
</head>
<body>
<div class="box">
<div id="hour"></div>
<div id="min"></div>
<div id="second"></div>
</div>
</body>
</html>
来源：https://www.cnblogs.com/verayangnakiss/p/8548812.html