前端ABC<html>
<head>
<title>test</title>
<style type="text/css">
#box{background-color:#B23AEE;margin:100px auto;}
</style>
</head>
<body>
<div id="box"></div>
<script type="text/javascript">
var box = document.getElementById('box');
var n=0;
function cont()
{
box.style.width=200+Math.sin(n/180)*100+"px";
box.style.height=200+Math.cos(n/180)*100+"px";
n++;
if(n>=4*Math.PI*180)n=0;
setTimeout(cont,5);
}
cont();
</script>
</body>
</html>
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