var util = require("util");

 /*

 * 1、实现继承

 * 2、对象的序列化

 * 3、检测数据类型

 * */

 //实现继承

 function Paa(){

     this.name = "zy";

     this.age = "23";

     this.sayHello = function(){

         console.log("hello");

     }

 }

 Paa.prototype.say = function(){

     console.log(this.name);

 }

 var paa = new Paa();

 // paa.say();

 function Caa(){

     this.name = "yz";

     this.age = "22";

 }

 util.inherits(Caa,Paa);//原型继承

 var caa = new Caa();

 // caa.say();

 // console.log(caa.age);//没有

 //对象的序列化

 console.log(typeof util.inspect(caa));//转化为字符串

 //检测数据类型

 // console.log(typeof []);

 console.log(util.isArray([]));

 console.log(util.isObject([]));