JavaScript动态函数Function构造函数用法解析

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>动态函数</title>
<script type="text/javascript">
  var show = new Function("x", "y", "var sum=x+y; return sum;");
  //注意new Function 定义动态函数,F大写
  var result = show(3, 5);
  alert(result);
</script>
</head>
<body>
</body>
</html>