Inheriting from Event Emitter

inherits.js

/*
 * inherits.js
 * @toanalien
 */
 
var util = require('util');
var EventEmitter = require('events');

function Toanalien() {
    this.toanalien = "Hello !";
}

util.inherits(Toanalien, EventEmitter); // lay properties cua EventEmitter cho vao Toanalien

Toanalien.prototype.toan = function() { // khoi tao prototype 'toan'
    console.log(this.toanalien);
    this.emit('toan'); // goi event 'toan'
}

var Toan = new Toanalien();

Toan.on('toan', function() {
    console.log('Hi !');
});

Toan.toan(); // goi method 'toan'

/*
 * output
 * Hello !
 * Hi !
 */