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JS基础-原型链 #58

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@yangmaoHu

每个实例对象(object)都有一个私有属性(称之为 __proto__)指向它的构造函数的原型对象(prototype )。该原型对象也有一个自己的原型对象( __proto__ ) ,层层向上直到一个对象的原型对象为 null。根据定义,null 没有原型,并作为这个原型链中的最后一个环节。

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