标签：console name age child Child log Constructor class 构造函数

• class

class Parent {
  constructor(name, age) {
    this.name = name;
    this.age = age;
    this.run = this.run
  }

  run() {
    return `${ this.name } is running, age is ${this.age}`;
  }

  sleep() {
    return `${ this.name } is sleeping, age is ${this.age}`;
  }
}
class Child extends Parent{
  constructor(name,age,run) {
    super(name,age,run); //继承父的name,age属性和run方法
  }
  say(){
    console.log(this.name,'is saying,age is',this.age)
  }
}

let child = new Child('zzz',12);
child.run() // "zzz is running, age is 12"
child.sleep() // "zzz is sleeping, age is 12"
console.log(child.constructor===Child);
console.log(child.__proto__.constructor===Child) // true
console.log(child.__proto__ ===Child.prototype) // true
console.log(child.__proto__.constructor.__proto__===Parent) //true

• 构造函数

function Parent(name,age){
  this.name = name;
  this.age = age;
  this.run = function(){
    return `${ this.name } is running, age is ${this.age}`;
  }
  
  this.sleep = function() {
    return `${ this.name } is sleeping, age is ${this.age}`;
  }
}

function Child (){
  this.say = function() {
    console.log(this.name,'is saying,age is',this.age)
  }
}

Child.prototype = new Parent();

let child = new Child('lisa',30);
child.say(); // "lisa is saying,age is 30"
child.run();// "lisa is running, age is 30"

console.log(child.__proto__.constructor === Parent) // true

console.log(child.__proto__ === Child.prototype) // true

console.log(Child.prototype.constructor===Parent) // true

标签：console,name,age,child,Child,log,Constructor,class,构造函数
来源： https://blog.csdn.net/sinat_36146776/article/details/112471423

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