Simple EventEmitter and ingeriter like a Node.js EventEmitter and util.inherits

EventEmitter.js

/** EventEmitter */
function EventEmitter() {
  var registry = {};

  this.getRegistry = function () {
    return registry;
  }
}

EventEmitter.prototype.emit = function (event, eventArgs) {
  var
    array,
    func,
    handler,
    i,
    type = typeof event === 'string' ? event : event.type;

  var registry = this.getRegistry();

  if (registry.hasOwnProperty(type)) {
    array = registry[type];
    for (i = 0; i < array.length; i++) {
      handler = array[i];

      func = handler.method;

      if (typeof func === 'string') {
        func = this[func];
      }

      func.apply(this, [eventArgs]);
    }
  }

  return this;
};

EventEmitter.prototype.on = function (type, method) {
  var registry = this.getRegistry();

  var handler = {
    method: method
  };

  if (registry.hasOwnProperty(type)) {
    registry[type].push(handler);
  } else {
    registry[type] = [handler];
  }

  return this;
};

EventEmitter.prototype.off = function (type) {
  var registry = this.getRegistry();

  delete registry[type];
};

/** inherit */
function inherit(Constructor, SuperConstructor) {
  Constructor.prototype = new SuperConstructor;
}

/** Illustration */
function Person(name) {
    this.name = name;
}

inherit(Person, EventEmitter);

var man = new Person('Jimmy');

man.on('sayName', function (eventArgs) {
    console.log(eventArgs);
    console.log(this.name);
});

man.emit('sayName', {message: 'Will emit correctly'});

man.off('sayName');