Inheritance in JavaScript - instance inheritance.

instance inheritance

//动物类
    function Animal(name, sex) {
    
    
        this.name = name || 'Animal';
        this.sex = sex || '未知';
        this.sleep = function () {
    
    
            console.log(this.name + "在睡觉！");
        }
    }
    //添加原型属性和方法
    Animal.prototype = {
    
    
        eat: function () {
    
    
            console.log(this.name + "在吃饭!");
        },
        play: function () {
    
    
            console.log(this.name + "在玩！");
        }
    }

    //子类
    function Mouse(){
    
    
        var animal=new Animal();

        return animal;
    }
    //下面这种写法可以使用
    //var mouse=new Mouse();
    var mouse=Mouse();
    console.log(mouse);

    //实例继承  子类的实例不是本身  是父类
    console.log(mouse instanceof  Mouse);//false
    console.log(mouse instanceof  Animal);//true

Advantages:
Unrestricted calling method (whether it is new or directly calling function execution)

Disadvantages:
Does not support multiple inheritance.