使用Object.create（）进行JavaScript继承？ [英] JavaScript inheritance with Object.create()?

问题描述

如何使用Object.create（）继承？我试过这些，但都没有工作：

How do I inherit with the Object.create()? I tried these, but none are working:

var B = function() {};
var A = function() {};
A = Object.create(B);
A.prototype.C = function() {};

和

var B = function() {};
var A = function() {};
A.prototype.C = function() {};
A = Object.create(B);

和

var B = function() {};
A = Object.create(B);
var A = function() {};
A.prototype.C = function() {};

没有任何效果。我该如何使用这个新的Object.create（） - 函数？

Nothing worked. How am I supposed to use this new Object.create()-function?

推荐答案

Object.create （）用于继承对象，而不是像你想要的那样构造。它几乎创建了一个新对象，旧对象设置为原型父对象。

Object.create() is used to inherit objects, not constructors like you're trying to do. It pretty much creates a new object with the old object set as its prototypal parent.

var A = function() { };
A.prototype.x = 10;
A.prototype.say = function() { alert(this.x) };

var a = new A();
a.say(); //alerts 10

var b = Object.create(a);
b.say(); //alerts 10
b.x = 'hello';
b.say(); //alerts 'hello'

并且只是为了确保b不仅仅是a的克隆，

And just to make sure b is not just a clone of a,

a.x = 'goodbye';
delete b.x;
b.say(); //alerts 'goodbye'

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