原型继承（传参）

    //Person人类 - 父类
        function Person(name) {
            this.name = name
        }
        Person.prototype.eat = function () {
            console.log(this.name,'吃饭')
        }

        //Student学生类 -子类
        function Student(num,name) {
            Person.call(this,name)
            this.num = num
        }

        //原型继承 - 父类实例对象赋值给子类原型
        Student.prototype = new Person()

        // let s1 = new Student(1001)
        let s1 = new Student(1001,'rose')
        s1.eat()
        console.log(s1.name);