node.js继承

person.js

module.exports = function(){
　　this.name = "person";
　　this.sleep = function(){
　　　　console.log("sleep in the night");
　　}
　　this.eat = function(){
　　　　console.log(‘eat food‘);
　　}
}

student.js

var util = require("util");
var Person = require(‘./person‘);

//定义student类
function Student(){
　　Person.call(this);
}

//将Student继承Person
util.inherits(Student,Person);

//重写study方法
Student.prototype.study = function(){
　　console.log("I am learning");
}

//暴露Student类
module.exports = Student;

testInherits.js

var Person = require(‘./person‘);
var Student = require(‘./student‘);

var personObj = new Person();
var studentObj = new Student();

console.log("-------for base class of person-------");
personObj.sleep();
personObj.eat();
console.log("---------------------------------");

console.log("-------for base class of student-------");
studentObj.sleep();
studentObj.eat();
studentObj.study();
console.log("---------------------------------");

静态调用

var util = require("util");
var Person = require(‘./person‘);

//定义student类
function Student(){
　　Person.call(this);
}

//将Student继承Person
util.inherits(Student,Person);

//重写study方法
Student.prototype.study = function(){
　　console.log("I am learning");
}

//将该动态对象的方法直接暴露给module.exports

var student= new Student();
module.exports.study = student.study;

module.exports.eat = student.eat;

module.exports.sleep = student.sleep;

//静态调用测试，无需实例化Student对象，

var Student = require(‘./student‘);

Student.sleep();
Student.eat();
Student.study();