如何使用自定义对象创建自定义对象？

Question

In Javascript how would I create a Custom Object that has a property this is another Custom Object. For Example.

function Product() {
    this.prop1 = 1;
    this.prop2 = 2;
}


function Work(values) {
    this.front = values.front || "default";
    this.back = values.back || "default";
    this.product =  Product;
}

var w = new Work();
alert(w.product.prop1); //no worky

Answer 1

You need to create an instance of Product , like this:

function Product() {
    this.prop1 = 1;
    this.prop2 = 2;
}
function Work(values) {
    this.front = values && values.front || "default";
    this.back = values && values.back || "default";
    this.product = new Product();
}
var w = new Work();
alert(w.product.prop1); //1

The front and back changes are a separate issue, since values wasn't being passed in in your example, you'd get an undefined error. You can test the result here .

---

Here's an alternative way I'd personally use to define those defaults:

function Work(values) {
    values = values || { front: "default", back: "default" };
    this.front = values.front;
    this.back = values.back;
    this.product = new Product();
}

You can try that version here .