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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>文档标题</title>
</head>
<body>
<div id="run" style="position:absolute;left:100px;top:100px;border:5px solid red;border-radius:5px;">
</div>
</body>
</html>
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var d = 0;
function run() {
var o =document.getElementById("run");
rx = 100 * Math.cos(d);
ry = 100 * Math.sin(d);
x = 100 + rx + 'px';
y = 100 - ry + 'px';
o.style.left = x;
o.style.top = y;
d = d + 0.03;
}
setInterval("run()",100);
输入 CSS 代码……