JavaScript Event Emitter

emitter.js

function Emitter() {
    this.events = {};
}

Emitter.prototype.on = function (type, listener) {
    this.events[type] = this.events[type] || [];
    this.events[type].push(listener);

}

Emitter.prototype.emit = function (type) {
    if(this.events[type]){
        this.events[type].forEach(function(listener){
            listener();
        });
    }
}

// Usage

var emtr = new Emitter();

emtr.on('myevent', function(){
    console.log('Function 1');
});

emtr.on('myevent', function(){
    console.log('Function 2!');
});


emtr.emit('myevent');