javascript 闭包真正理解

源码：
<!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>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>无标题文档</title>
        <script src="jquery.min.js" language="javascript" type="text/javascript"></script>
        <script src="wkl_ajax.js" language="javascript" type="text/javascript"></script>
        <script type="text/javascript">
            function f(x, n) {//求幂
                var result = 1;
                for(var i = 0; i < n; i++) {
                    result *= x;
                }
                return result;
            }

            function currying(n) {
                return function(x) {
                    return f(x, n);
                };
            }

            var square = currying(2);
            var cube = currying(3);

            alert(square(2));
            //4
            alert(cube(2));
            //8
        </script>
    </head>
    <body>
        <div class="me">
            test
        </div>
    </body>
</html>
完