继承 //圣杯

如以下代码，User 之中应该包含 VIPUser 但是VIPUser却用不了User的sayHello 方法，

 function User(firstName, lastName, age) {
            this.firstName = firstName;
            this.lastName = lastName;
            this.age = age;
            this.fullName = this.firstName + " " + this.lastName;
        }
        User.prototype.sayHello = function() {
            console.log(`大家好，我叫${this.fullName}，今年${this.age}岁了`);
        }
        function VIPUser(firstName, lastName, age, money) {
            User.call(this, firstName, lastName, age);
            this.money = money;
        }
        VIPUser.prototype.upgrade = function() {
            console.log(`使用了${100}元软妹币，升级了！`);
            this.money -= 100;
        }
        var vUser = new VIPUser("姬", "成", 1, 100);
    </script>

它们原型链如下图

如何让 vUser也可以是使用 User的方法呢

        function User(firstName, lastName, age) {
            this.firstName = firstName;
            this.lastName = lastName;
            this.age = age;
            this.fullName = this.firstName + " " + this.lastName;
        }
        User.prototype.sayHello = function () {
            console.log(`大家好，我叫${this.fullName}，今年${this.age}岁了`);
        }
        function VIPUser(firstName, lastName, age, money) {
            User.call(this, firstName, lastName, age);
            this.money = money;
        }
        myplugin.inherit(VIPUser , User)
        VIPUser.prototype.upgrade = function () {
            console.log(`使用了${100}元软妹币，升级了！`);
            this.money -= 100;
        }
        var vUser = new VIPUser("姬", "成", 1, 100);
        // 继承 es5的方法 圣杯
        if (!this.myplugin) {
            this.myplugin = {};
        }
        this.myplugin.inherit = function (son, father) {
            son.prototype = Object.create(father.prototype);//create/es5  创建一个新对象，其隐式原型指向father.prototype
            son.prototype.constructor = son;
            son.prototype.usber = father.prototype
        }

原型链如下

老版本的方法 圣杯

        this.myplugin.inherit = function (son, father) {
            // 之前的写法 圣杯模式
            function Temp() { };
            Temp.prototype = father.prototype;
            son.prototype = new Temp();
            son.prototype.constructor = son;
            son.prototype.usber = father.prototype;
            // 高级简化版
            (function () {
                function Temp() { };
                return function (son, father) {
                    Temp.prototype = father.prototype;
                    son.prototype = new Temp();
                    son.prototype.constructor = son;
                    son.prototype.usber = father.prototype
                }
            })(son, father)
        }

原型链如下