JS案例：求圆周率的4次方
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<!doctype html>
<html>
<head>
<meta chaeset="utf8">
<title></title>
</head>
<body>
<script type="text/javascript">
var p,num
p=Math.PI;
num =Math.round(Math.pow(p,4));
alert("圆周率的4次方经过四舍五入取整后的值为："+num);
</script>
</body>
</html>
