87,901
社区成员
发帖
与我相关
我的任务
分享
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<style type="text/css">
#aa {
position:absolute;
left:0px;
top:0px;
width:30px;
height:30px;
z-index:99;
background-color: #ad7ee7;
}
</style>
</head>
<body>
<div id="aa"></div>
<script type="text/javascript">
var x=300, y=0, r=300, t=0;
function run()
{
var tr = t*Math.PI/180;
var tx = x-Math.cos(tr)*r;
var ty = y+Math.sin(tr)*r;
var aa = document.getElementById("aa");
aa.style.left=tx+"px";
aa.style.top=ty+"px";
t+=1;
if(t<=180)
setTimeout(run,20);
else
aa.style.display="none";
}
run();
</script>
</body>
</html>