//1。 合理设计这两个类。 2。 student 继承person  3 不能使用classfunction Person(id, name) {    if(!(this instanceof Person)){        return new Person(id,name);    }    this.id = id;    this.name = name;}Person.prototype.say = function (text) {    console.log("say:" + text)};function Student(id, name) {    if(!(this instanceof Student)){        return new Student(id,name);    }    Person.call(this, id, name)}Student.prototype = new Person();Student.prototype.learn = function () {    console.log('learn')};var s = new Student(111, 'tom');var s2 = Student(111, 'tom');   // 支持不使用new关键字创建对象。s.say("hello");console.log(s instanceof Person);console.log(s instanceof Student);