PubSub-javascript/publish.js at master · sumairz/PubSub-javascript · GitHub

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var events = (function() {

    var events = {};

    function on(eventName, fn) {
        events[eventName] = events[eventName] || [];
        events[eventName].push(fn);
    }

    function off(eventName, fn) {
        if (events[eventName]) {
            for (var i = 0; i < events[eventName].length; i++) {
                if( events[eventName][i] === fn ) {
                    events[eventName].splice(i, 1);
                    break;
                }
            }
        }
    }

    function trigger(eventName, data) {
        if (events[eventName]) {
            events[eventName].forEach(function(fn) {
                fn(data);
            });
        }
    }

    return {
        on: on,
        off: off,
        trigger: trigger
    };

})();