nodejs中方法和模块用法示例

var express = require("express");
var app = express();
var hostName = "127.0.0.1";
var port = 8080;
app.all("*",function(req,res,next){
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
  res.header("X-Powered-By",' 3.2.1')
  res.header("Content-Type", "application/json;charset=utf-8");
  next();
});
function print(){
  console.log("这是server3.js中的方法");
}
print();
app.listen(port,hostName,function(){
  console.log("服务器运行成功...");
});

function print(){
  console.log("这是utils.js中的print方法");
}
exports.print = print;

require后面的是相对开启服务的js文件路径
var utils = require("../utils.js");
utils.print();

module.exports ={
  "print":function(){
    console.log("这是utils.js中的print方法");
  },
  "toast":function(str){
    console.log("toast方法"+str);
  }
}

var methodName = "print";
utils[methodName]();
utils.toast("hello");

function Person(name,color,age,language){
  this.color = color;
  this.name = name;
  this.age = age;
  this.language = language;
  this.speak = function(){
    console.log(this.name+this.age+this.color+"在讲"+this.language);
  }
}
module.exports = Person;

var Person = require("./Person.js");
var person = new Person("张三","黄种人",18,"汉语");
person.speak();

var Person = require("./Person.js");
function YellowPerson(name,color,age,language){
  //通过apply方法集成person的属性和方法
  Person.apply(this,[name,color,age,language]);
  this.like = function(){
    console.log("黄种人喜欢写代码...");
  }
}
module.exports = YellowPerson;

var YellowPerson = require('./YellowPerson.js');
var yellowPerson = new YellowPerson("李四","黄种人",20,"汉语");
yellowPerson.speak();
yellowPerson.like();