Js匿名闭包

看到一个js教程，以前没琢磨

　　  function box() {
            var arr=[];
            for (var i = 0; i < 5; i++) {
                arr[i] = function () {
                    return i;
                }
            }
            i = 10;
            return arr;
        }

        var b = box();
        for (var i = 0; i < 5; i++) {
            alert(b[i]())// 5个 10
        }

与下面的区别

  function box() {
            var arr=[];
            for (var i = 0; i < 5; i++) {
                arr[i] = (function () {
                    return i;
                })()；

　　　　　　//或者这样

/*

arr[i] = (function (num) {
                    return num;
                })(i)

//或者

  arr[i] = (function (a) {
                    return function () {
                        return a;
                    }
                })(i);

*/
            }
            i = 10;
            return arr;
        }

        var b = box();
        for (var i = 0; i < 5; i++) {
            alert(b[i]) // 0 到 4
        }

Js匿名闭包

原文：http://www.cnblogs.com/WindWall/p/5203749.html