原型链关系图

a instanceof B 检测B.prototype是否存在于参数a的原型链上console.log(s instanceof Son);//true  console.log(s instanceof Parent);//true    

输出

__proto__

function(){}

Function.prototype

Function.__proto__

p

{constructor: ƒ Person()[[Prototype]]: Object}

s

Parent

constructor

let p = new Parent();Son.prototype = Object.create(Parent.prototype);let s = new Son();

Parent{}

Object.__proto__

Object.prototype

null

Object{}

Array/String/Date/Object/Parent等Function的实例

Son

Son.prototype

Parent.prototype