【基础】实现一个Person和他的子类Student

实现一个Person和他的子类Student, Person要求有一个私有变量age和共有变量name，同时拥有一个共有方法getAge。Student继承Person，并且拥有一个共有方法readBook。并给出如下两行的输出结果：

      console.log(oneStudent instanceof Person);      console.log(oneStudent instanceof Student);

我的实现：

  

function Person(){var age = 15; this.name = 'one Person'; this.getAge = function(){     return age; }}var onePerson = new Person();console.log(onePerson.name);console.log(onePerson.getAge());

function Student(){ this.readBook = function(){    console.log('i am reading.'); }}Student.prototype = new Person();

var oneStudent = new Student();oneStudent.name ='one student';oneStudent.readBook();

console.log(oneStudent.name);console.log(oneStudent instanceof Person); //trueconsole.log(oneStudent instanceof Student);//true

console.log(onePerson instanceof Student);//false

总结：oneStudent instanceof Person 的值是true，可以通过这个特性，实现面向接口的编程，从而实现灵活扩展。