//引入events模块

var events = require('events');

//初始化events.EventeEmitter()对象

var eventEmitter = new events.EventEmitter();

//声明一个回调函数

function ring = function(){console.log("Ring,ring ,ring!!!!")}

//采用eventEmitter中的on方法绑定事件

eventEmitter.on('ring',ring);

//触发绑定所有绑定在on上的事件

eventEmitter.emit('ring');

var events = require('events');

var util       = require('util');

function ring(){

    events.EventEmitter.call(this);

    this.open = function(){

             console.log("ring inherits from events.EventEmitter");

             this.emit('open');

    }

}

util.inherits(ring,events.EventEmitter);

var ring_instance =  new ring;

ring_instance.on('open',function(){console.log("Inherits events.EventEmitter and use on bind function")});

ring_instance.open();