ES5,ES6的方式创建类以及继承

创建类 

1.使用ES5的方式创建类

所有的属性放在构造函数里面,所有的方法写在原型上

function Obj (name,age){

    this.name = name
    this.age = age

}
Obj.protoType.sayHi = function () {

  console.log ('我是' + this.name + ',' + '年龄' + this.age)

}
var c1 = new Obj ('小明','20')

Obj.version = '1.0.1'

Obj.fn = function () {

  console.log('函数的静态方法')

}

c1.sayHi() // 可以访问原型上的方法
// c1.fn()  // 实例不允许访问静态方法
Obj.fn() // 构造函数也是对象,调用了自己的方法

2.使用ES6的方式创建类

Class Person {

  constructor(name,age){
     this.name = name
     this.age = age
  }

  sayHi(){
     console.log(this.name)
  }

  static fn () {
     console.log('这是构造函数的静态方法')
  }

}

var c2 = new Person ('小刘','22')
c2.sayHi()
// c2.fn()  // 实例不允许访问构造函数的静态方法

ES5,ES6实现继承

(1)ES5继承

function Person (name) {
  this.name = name 
}

Person.protoType.fn = function () {
  console.log(this.name)
}

function Child (c,name) {
   this.lookLike = c
   Person.call (this,name)
}

Child.protoType = Object.create(Person.protoType)
Child.protoType.constructor = Child

(2)ES6继承

Class Person {
  constructor (name) {
    this.name = name
  }
  fn () {
    console.log(this.name)
  }

}
Class Child extends Person {
  constructor (c,name) {
   super (name)
   this.lookLike = c
  }
}