JavaScript各种继承方式（六）：寄生组合继承

function Fruit(name){
    this.name = name;
}

Fruit.prototype.eat = function(){
    console.log(‘eat‘);
}

function Mango(name,level){
    Fruit.call(this,name);
    this.level = level;
}

function create(obj){
    let instance = Object.create(obj);
    // 对父类的实例进行了增强
    instance.desc = function(){
        console.log(‘desc‘);
    };
    return instance;
}

Mango.prototype = create(Fruit.prototype); // 通过寄生拿到父类的实例，并没有调用父类的构造函数
Mango.prototype.constructor = Fruit;

let mango1 = new Mango(‘泰国芒果‘,‘优‘);
let mango2 = new Mango(‘海南芒果‘,‘良‘);

console.log(mango1);
console.log(mango2);