在javascript中访问父对象

Question

    var user = {
        Name: "Some user",
        Methods: {
            ShowGreetings: function() {
                    // at this point i want to access variable "Name", 
                    //i dont want to use user.Name
                    // **please suggest me how??**
                 },
            GetUserName: function() { }
        }
    }

Answer 1

你不能.

JavaScript中没有向上的关系.

举个例子:

var foo = {
    bar: [1,2,3]
}

var baz = {};
baz.bar = foo.bar;

单个数组对象现在有两个"父".

你能做的是:

var User = function User(name) {
    this.name = name;
};

User.prototype = {};
User.prototype.ShowGreetings = function () {
    alert(this.name);
};

var user = new User('For Example');
user.ShowGreetings();

Answer 2

var user = {
    Name: "Some user",
    Methods: {
        ShowGreetings: function() {
            alert(this.Parent.Name); // "this" is the Methods object
        },
        GetUserName: function() { }
    },
    Init: function() {
        this.Methods.Parent = this; // it allows the Methods object to know who its Parent is
        delete this.Init; // if you don't need the Init method anymore after the you instanced the object you can remove it
        return this; // it gives back the object itself to instance it
    }
}.Init();

Answer 3

克罗克福德:

"特权方法能够访问私有变量和方法,并且本身可以访问公共方法和外部"

例如:

function user(name) {
     var username = name;

     this.showGreetings = function()
     {
       alert(username);
     }  
}