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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
.box{width:100px;height:100px;margin:30px auto; position:relative;border:1px solid #000;}
#box{width:100px;height:100px;background:red; position:absolute;left:0;top:0;}
</style>
</head>
<body>
<div class="box">
<div id="box"></div>
</div>
<script>
var oBox=document.getElementById("box");
var iDeg=0;
setInterval(function(){
iDeg++;
toRotate(oBox,iDeg);
},30);
function toRotate(obj,iDeg)
{
var a=Math.round(Math.cos(iDeg/180*Math.PI)*100)/100;
var b=Math.round(Math.sin(iDeg/180*Math.PI)*100)/100;
var c=-b;
var d=a;
obj.style.WebkitTransform="matrix("+a+","+b+","+c+","+d+",0,0)";
obj.style.MozTransform="matrix("+a+","+b+","+c+","+d+",0,0)";
obj.style.transform="matrix("+a+","+b+","+c+","+d+",0,0)";
obj.style.filter="progid:DXImageTransform.Microsoft.Matrix( M11="+a+", M12= "+c+", M21= "+b+" , M22="+d+",SizingMethod=‘auto expand‘)";
obj.style.left=(obj.parentNode.offsetWidth-obj.offsetWidth)/2+"px";
obj.style.top=(obj.parentNode.offsetHeight-obj.offsetHeight)/2+"px";
}
</script>
</body>
</html>
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原文地址：http://www.cnblogs.com/week-1/p/5902691.html
