function Parent() {

  this.path = []

}

function Child() {

}

Child.prototype = new Parent(); // 原型链继承

const child1 = new Child();

const child2 = new Child();

child1.path.push(1);

console.log(child1.path===child2.path); // 原型链继承方式所有子类共享父类的状态

function Parent1() {

  this.name = "parent1";

}

Parent.prototype.getName = function () {

  return this.name;

}

function Child1() {

  Parent1.call(this);

  this.age = 18;

}

const child3 = new Child1();

child3.getName();  // 报错，借助 call 继承无法获取父类原型上的方法。

function Parent2() {

  this.name = "parent2"

}

Parent2.prototype.getName = function () {

  return this.name;

}

function Child2() {

  Parent2.call(this);

  this.age = 18;

}

Child2.prototype = new Parent2();

Child2.prototype.constructor = Parent2;

const child4 = new Child2();

const child5 = new Child2();

let parent3 = {

  name:"parent3",

  path:["p1","p2"],

  getName:function () {

    return this.name;

  }

}

let child6 = Object.create(parent3)

child6.name = "child6";

child6.path.push("p6");

let child7 = Object.create(parent3);

child7.path.push("p7");

console.log(child6.name); // 子实例重写属性

console.log(child6.name===parent3.getName());

console.log(child7.name); // 子实例继承属性

console.log(child6.path===child7.path); // 子实例共享父实例的属性

let parent4 = {

  name:"parent4",

  path:["p4"],

  getName:function () {

    return this.name;

  }

}

function clone1(original) {

  let clone = Object.create(original);

  clone.getPath = function () {

    return this.path;

  }

  return clone;

}

let child8 = clone1(parent4);

console.log(child8.getName());

console.log(child8.getPath());

function clone(parent,child) {

  child.prototype = Object.create(parent.prototype);

  child.prototype.constructor = child;

}

function Parent5() {

  this.name = "parent5";

  this.paly = [1,2,3];

}

Parent5.prototype.getName = function () {

  return this.name;

}

function Child6() {

  // 子类构造函数中调用父类构造函数，组合的方式添加属性

  Parent5.call(this);

  this.friends = "child6";

}

// 子类原型是父类原型的实例

clone(Parent5,Child6);

Child6.prototype.getFriends = function () {

  return this.friends;

}

let person6 = new Child6();

console.log(person6);

console.log(person6.getName());

console.log(person6.getFriends());