Subscriber.js

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

Subscriber.prototype.create = function(event){
    if(this.events[event]){
        return;
    }
    
    this.events[event] = [];
    
    return;
};
Subscriber.prototype.subscribe = function( event, callback, scope){
    if(!this.events[event]){ return; }
    
    
    this.events[event].push({callback:callback,scope:scope});
};

Subscriber.prototype.trigger = function(event,data){
    if(!this.events[event]) { return; }
    var i,
        callback,
        scope,
        output;
        
    for( i in this.events[event]){
        callback = this.events[event][i]["callback"];
        scope = this.events[event][i]["scope"];
        if(!scope){
            output = callback(data);
        } else {
            output = callback.apply(scope, [data]);
        }
        
    }
    
    return;
};

mySubscriber = new Subscriber();


myCallback = function(){
    console.log("Test 1");
};

mySubscriber.create("testing");

mySubscriber.subscribe("testing", myCallback);

mySubscriber.trigger("testing");


mySecondCallback = function(){
    console.log(this.message);
};

scope = {
    message: "Test 2"
};


mySubscriber.create("testing2");

mySubscriber.subscribe("testing2", mySecondCallback,scope);

mySubscriber.trigger("testing2");



myThirdCallback = function(data){
    console.log("scope",this.message, "data",data.message);
};

scope = {
    message: "Test 3"
};

data = {
    message: "Test 3 data"
};

mySubscriber.create("testing3");

mySubscriber.subscribe("testing3", myThirdCallback,scope);

mySubscriber.trigger("testing3", data);