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

    Parent.prototype.work = function () {
        console.log(this.name + " is working");
    };

    function Child(name, anotherName) {
        Parent.call(this, name); // 执行函数Parent(name)
        this.anotherName = anotherName;
    }

    Child.prototype = Object.create(Parent.prototype); // Object.create(Parent.prototype)的作用是：创建一个空对象，空对象的__proto__等于Parent.prototype

    Child.prototype.play = function () {
        console.log(this.anotherName + " is playing");
    };

    var child = new Child("Googler", "Googlex");
    child.work();
    child.play();

原型图

原型图.png

结束语

如果喜欢本文，记得点赞并加关注哟。