属性“__ proto_”被储存了？ [英] Where the property "__proto_" is stored?

问题描述

告诉我属性__proto_存储在哪里？

Tell me where the property "__proto_" is stored ?

推荐答案

它继承自 Object.prototype ：

({}).hasOwnProperty('__proto__') // false
Object.prototype.hasOwnProperty('__proto__') // true

根据 MDN文章，

__ proto __ 属性没有什么特别之处。它只是
一个访问者属性 - 一个由getter函数和
a setter函数组成的属性 - 在 Object.prototype 。
__ proto __ 的属性访问，最终咨询 Object.prototype 将找到这个
属性，但访问不参考 Object.prototype
找不到它。如果在
__ proto __ 属性查询了JavaScript / Reference / Global_Objects / Object / prototyperel =nofollow> Object.prototype ，该属性将隐藏 .org / zh-CN / docs / Web / JavaScript / Reference / Global_Objects / Object / prototyperel =nofollow> Object.prototype 。

There is nothing special about the __proto__ property. It is simply an accessor property -- a property consisting of a getter function and a setter function -- on Object.prototype. A property access for "__proto__" that eventually consults Object.prototype will find this property, but an access that does not consult Object.prototype will not find it. If some other "__proto__" property is found before Object.prototype is consulted, that property will hide the one found on Object.prototype.

请注意，此属性不是标准属性，某些浏览器可能没有。标准方法是：

Note this property isn't standard and some browsers may not have it. The standard way is:

• Object.getPrototypeOf 获取内部 [[Prototype]] ，在ES5中定义。


• Object.setPrototypeOf 设置内部 [[原型]] ，在ES6中定义。

• Object.getPrototypeOf to get the internal [[Prototype]], defined in ES5.
• Object.setPrototypeOf to set the internal [[Prototype]], defined in ES6.

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