为什么console.log（）不显示Object.create的继承属性？ [英] Why does console.log() not show inherited properties from Object.create?

问题描述

我试图在基础对象上利用 Object.defineProperty（）时遇到挂起。我想使用 Object.create（）继承该对象的属性，然后在派生对象中定义更多属性（可以从那里继承）。我应该注意到我的目标是在node.js。

I am running into a hangup while trying to leverage Object.defineProperty() on a base object. I want to inherit properties from that object, using Object.create(), and then define more properties in the derived object (which may be inherited from there). I should note that I am targetting this at node.js.

这是一个例子：

var Base = {};

Object.defineProperty(Base, 'prop1', {
    enumerable:true,
    get:function(){ return 'prop1 value';}
});

Object.defineProperty(Base, 'prop2', {
    enumerable:true,
    value : 'prop 2 value'
});

Object.defineProperty(Base, 'create', {
    value:function(){
        return Object.create(Base);
    }
});

console.log(Base);

var derived = Base.create();

Object.defineProperty(derived, 'prop3', {
    enumerable:true,
    value:'prop 3 value'
});

console.log(derived);

其中输出以下内容：

{ prop1: [Getter], prop2: 'prop 2 value' }
{ prop3: 'prop 3 value' }

我认为console.log（）会枚举继承的属性，以及属性 prop3 我是在派生对象上定义。看起来它不会查找以这种方式定义的属性的原型层次结构。这是正确的吗？

I thought that console.log() would enumerate the inherited properties, as well as the property prop3 that I defined on the derived object. It would seem that it does not look up the prototype hierarchy for properties defined in this way. Is that correct?

我看着覆盖我的对象的 toString（）方法，但似乎是控制台.log（）不会调用它。

I looked at overriding the toString() method for my object, but it seems that console.log() does not call that.

1. 如何记录所有属性而不必枚举它们？


2. 这是实现继承的有效方式吗？

编辑：

1. node.js库中是否有另一个函数可以完成这项工作并记录继承的属性？

推荐答案

Firebug 记录继承的属性：

Firebug does log the inherited properties:

而Chrome为您提供了一个树视图，其中包括继承的属性：

while Chrome gives you a tree-view which includes the inherited properties:

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