從方法實例訪問此變量

Question

如何從另一個對象實例訪問此對象？

var containerObj = { 
    Person: function(name){ 
     this.name = name; 
    } 
} 
containerObj.Person.prototype.Bag = function(color){ 
    this.color = color; 
} 
containerObj.Person.prototype.Bag.getOwnerName(){ 
    return name; //I would like to access the name property of this instance of Person 
} 

var me = new Person("Asif"); 
var myBag = new me.Bag("black"); 
myBag.getOwnerName()// Want the method to return Asif 

Answer 1

不要把構造函數放在另一個類的原型上。使用工廠模式：

function Person(name) { 
    this.name = name; 
} 
Person.prototype.makeBag = function(color) { 
    return new Bag(color, this); 
}; 

function Bag(color, owner) { 
    this.color = color; 
    this.owner = owner; 
} 
Bag.prototype.getOwnerName = function() { 
    return this.owner.name; 
}; 

var me = new Person("Asif"); 
var myBag = me.makeBag("black"); 
myBag.getOwnerName() // "Asif" 

相關的模式來解決這個問題：Prototype for private sub-methods，Javascript - Is it a bad idea to use function constructors within closures?