__proto__ VS. JavaScript中的原型 [英] __proto__ VS. prototype in JavaScript

问题描述

此图再次显示每个对象都有一个原型。构造函数
函数Foo也有自己的 __ proto __ ，它是Function.prototype，
，而且它还通过其 __ proto__引用再次将属性改为
的Object.prototype。因此，重复，Foo.prototype只是Foo的显式
属性，它引用了b和c对象的原型。

This figure again shows that every object has a prototype. Constructor function Foo also has its own __proto__ which is Function.prototype, and which in turn also references via its __proto__ property again to the Object.prototype. Thus, repeat, Foo.prototype is just an explicit property of Foo which refers to the prototype of b and c objects.

var b = new Foo(20);
var c = new Foo(30);

__ proto __ 和<之间有什么区别？ code>原型属性？

该图取自这里。

推荐答案

__ proto __ 是查找链中用于解析方法等的实际对象。 prototype 是用于构建 __ proto __ <的对象/ code>当您使用 new 创建对象时：

__proto__ is the actual object that is used in the lookup chain to resolve methods, etc. prototype is the object that is used to build __proto__ when you create an object with new:

( new Foo ).__proto__ === Foo.prototype;
( new Foo ).prototype === undefined;

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