原型链与原型链继承

标签：__ function proto 继承 age 原型 prototype nos

1. 原型

对象：__proto__

函数对象: __proto__   prototype

原型链结构

 查看一个空对象， __proto__ . __proto__ . __proto__ .  每个__proto__ 指向创建它的__proto__  最终指向Object的原型prototype （Object是一个函数对象）

查找不到返回null

2. 函数继承

//原型链继承 function Father(name, color) {   this.name = name;   this.color = color; } Father.prototype.running = function () {   return `名字：${this.name}`; }; function Child(age, nos) {   this.age = age;   this.nos = nos; } Child.prototype = new Father(); Child.prototype.eating = function () {   return `eating:${this.name}`; }; let Childone = new Child("age", "nos"); console.log("原型链继承", Childone); //借用构造函数继承 function Child(age, nos) {   Father.call(this, name, color);   this.age = age;   this.nos = nos; } //寄生式继承 function foo(o) {   let Fn = function () {};   Fn.prototype = o;   return new Fn(); } //寄生组合式继承 function inheritPrototype(son, dad) {   son.prototype = foo(dad.prototype);   son.defineproperty(son.prototype, "construction", {     enumberable: false,     configurable: true,     writerable: false,     value: dad,   }); }

 

标签：__,function,proto,继承,age,原型,prototype,nos
From： https://www.cnblogs.com/zhangzheblog/p/17398263.html