var main = main || {};    ; (function (main) {        'use strict';        //私有变量        var _s1 = 'Hello ';        var _s2 = 'World!~';        //私有方法        var _func = {            helloWorld: function (str1, str2) {                return str1 + str2;            }        };        //公有方法        main.method = {            add: function (a, b) {                return a + b;            },            subtract: function (a, b) {                return a - b;            },            multiply: function (a, b) {                return a * b;            },            divide: function (a, b) {                return a / b;            },            total: function (a, b) {                return _func.helloWorld(_s1, _s2) + this.add(a, b) + this.subtract(a, b) + this.multiply(a, b) + this.divide(a, b);            }        };        //将公有方法返回        return main.method;            })(main);    var t = main.method.total(1, 1);    console.log(t);///"Hello World!~2011"

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