使用Object.create实现原型继承

function Base() {}Base.prototype.say=function(){console.log("base say")}function Derived() {}Derived.prototype = Object.create(Base.prototype);Derived.prototype.derivedSay=function(){}
const obj = new Derived();console.log("obj",obj)obj.say()

使用Object.setPrototypeOf实现原型继承

function Base() {}Base.prototype.say=function(){}function Derived() {}Derived.prototype.derivedSay=function(){}// 将 `Derived.prototype` 的 `[[Prototype]]`// 设置为 `Base.prototype`Object.setPrototypeOf(Derived.prototype, Base.prototype);const obj = new Derived();

对比&&总结

Object.create实现属性继承时候，重新为 prototype 属性赋值，同时删除原型对象的constructor属性
所以需要从新更新原型对象的构造函数指向

Derived.prototype.constructor=Derived;