var broker = new Pubsub();

    broker.on('foo', function (m) {
        console.log('Got the message ', m);
    });

    broker.trigger('foo', 42);

    broker.off('foo');

    var Pubsub = function () {
        this._events = {};
    };

SUBSCRIBE TO EVENTS

    Pubsub.prototype.on = function (type, handler) {
        if (this._events[type] === undefined) {
            this._events[type] = [];
        }
        this._events[type].push(handler);
    };

TRIGGER EVENTS

     Pubsub.prototype.trigger = function (event, message) {
        var events;

        if (this._events[event] instanceof Array) {
            events = this._events[event];
            events.forEach(function (e) {
                e.call(this, message);
            });
        }
    };

    Pubsub.prototype.off = function (type) {
        if (this._events[type]) {
            delete this._events[type];
        }
    };

var broker = new Pubsub();

broker.on('foo', function (m) {
    console.log('Got the message ', m);
});

broker.trigger('foo', 42);>>Got the message  42

broker.trigger('foo', 26);
>>Got the message  26

broker.off('foo');

broker.trigger('foo', 'Never show this');