Javascript'；s"；Object.getOwnPropertyNames“；丢失的属性？

我喜欢Object.getOwnPropertyNames方法。它似乎是从JS外壳中学习对象的一个非常有用的工具

然而，让我抓狂的是getOwnPropertyNames似乎缺少一些（注意：在我的测试中，我运行的是ECMA5实现Google Chrome版本28.0.1500.95）

下面是一个例子：

> var x= []
undefined
> x.constructor
function Array() { [native code] }
> Object.getOwnPropertyNames(x)
["length"]

然而很明显，x有很多属性！（例如）

有人能解释一下这里发生了什么吗？谢谢D

编辑：好的！我看到getOwnPropertyNames只获取手头对象的属性名。有没有一种简单的方法可以获得继承的属性？或者，唯一的方法可能是遍历object.constructor.prototype.\uuuuuuuuuuu？

根据

\uuuu proto\uuu

属性已弃用，不应使用<代码>对象。应使用getPrototypeOf而不是

\uuuu proto\uuuu

getter来确定对象的[[Prototype]]

> x = [];
[]
> Object.getOwnPropertyNames(Object.getPrototypeOf(x));
["length", "constructor", "toString", "toLocaleString", "join", "pop", "push", "concat",
 "reverse", "shift", "unshift", "slice", "splice", "sort", "filter", "forEach", "some", 
 "every", "map", "indexOf", "lastIndexOf", "reduce", "reduceRight"]

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编辑后的问题可能与

> x = [];
[]
> Object.getOwnPropertyNames(Object.getPrototypeOf(x));
["length", "constructor", "toString", "toLocaleString", "join", "pop", "push", "concat",
 "reverse", "shift", "unshift", "slice", "splice", "sort", "filter", "forEach", "some", 
 "every", "map", "indexOf", "lastIndexOf", "reduce", "reduceRight"]