javascript eventEmitter

eventEmitter.js

var events = require('events');
 
function Door(colour) {
  this.colour = colour;
  events.EventEmitter.call(this);
 
  this.open = function()
  {
  this.emit('open');
  }
}
 
Door.prototype.__proto__ = events.EventEmitter.prototype;
 
var frontDoor = new Door('brown');
 
frontDoor.on('open', function() {
    console.log('ring ring ring');
  });
frontDoor.open();