Node.js events EventEmitter add listener

var events = require('events');
var eventEmitter = new events.EventEmitter();
// listener #1//from  w ww. j  av  a 2s.  c o  m
var listner1 = function listner1() {
   console.log('listner1 executed.');
}
// listener #2
var listner2 = function listner2() {
  console.log('listner2 executed.');
}
// Bind the connection event with the listner1 function
eventEmitter.addListener('connection', listner1);

// Bind the connection event with the listner2 function
eventEmitter.on('connection', listner2);

//var eventListeners = require('events').EventEmitter.listenerCount(eventEmitter,'connection');
var eventListeners = eventEmitter.listenerCount('connection');
console.log(eventListeners + " Listner(s) listening to connection event");

// Fire the connection event
eventEmitter.emit('connection');

// Remove the binding of listner1 function
eventEmitter.removeListener('connection', listner1);
console.log("Listner1 will not listen now.");

// Fire the connection event
eventEmitter.emit('connection');

eventListeners = require('events').EventEmitter.listenerCount(eventEmitter,'connection');
console.log(eventListeners + " Listner(s) listening to connection event");

console.log("Program Ended.");