====== Node.js Events ======

===== Examples =====

<code javascript>
var events = require('events');
var eventEmitter = new events.EventEmitter();

var ringBell = function ringBell()
{
  console.log('ring ring ring');
}
eventEmitter.on('doorOpen', ringBell);

eventEmitter.emit('doorOpen');
</code>

<code javascript>
eventEmitter.on('doorOpen', ringBell);
eventEmitter.on(‘doorOpen’, doSomething);
eventEmitter.on(‘doorOpen’, doSomethingElse);

eventEmitter.emit('doorOpen');
</code>

<code javascript>
eventEmitter.on(‘doorOpen’, function(ring)
{
    Console.log(ring);
}
eventEmitter.emit(‘doorOpen’, ‘ringeling’);
</code>

<code javascript>
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();
</code>

<code javascript>
var ring = function()
{
    console.log('ring');
}
frontDoor.on('open', ring);

console.log(require('util').inspect(frontDoor.listeners('open'))); // Outputs ring
</code>

<code javascript>
frontDoor.removeListener('open', ring);
</code>

<code javascript>
frontDoor.removeAllListeners(‘open’);
</code>

===== 참고 =====
  * [[http://www.sitepoint.com/nodejs-events-and-eventemitter/|Node.js Events and EventEmitter]]