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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title> 页面名称 </title>
<style type="text/css">
#d {
width: 50px;
height: 50px;
background-color: #f00;
}
</style>
</head>
<body>
<div id="d"></div>
<script type="text/javascript">
function setRotate(n) {
var t = (500-n)/500*(-230);
document.getElementById("d").style.transform = "rotate("+t+"deg)";
}
setRotate(250);
</script>
</body>
</html>