类与继承

类与继承

 function Animal(name){
     this.name = name;
 }
 Animal.abc = function(){};
 $.ajax = function(){};
 Animal.prototype.showName = function(){
     console.log(this.name);
 }
 var a = new Animal('Tom');
 a.showName();
 var a1 = new Animal('Jerry');
 a1.showName();
 -------------------------
class Animal{
     静态方法(静态方法只能通过类名调用，不可以使用实例对象调用)
    static showInfo(){
        console.log('hi');
    }
     构造函数
    constructor(name){
        this.name = name;
    }

    showName(){
        console.log(this.name);
    }
}
 let a = new Animal('spike');
 a.showName();
 a.showInfo();
 Animal.showInfo();
 ------------------------------
 类的继承extends
class Dog extends Animal{
    constructor(name,color){
        super(name);super用来调用父类
        this.color = color;
    }

    showColor(){
        console.log(this.color);
    }
}

let d = new Dog('doudou','yellow');
d.showName();
d.showColor();
 d.showInfo();
Dog.showInfo();

赏

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