How to use the events.addListener function in events

var AnswerTrigger = function(opts) {
    AnswerTrigger.superclass.constructor.call(this, opts);
    this.getBoolean('correctness', opts, 'correct', 'incorrect');
    
    // Listen for when a question is answered
    events.addListener(SS.eventRelay, 'answerQuestionTrigger', this.handle.bind(this));
}
AnswerTrigger.inherit(SS.Trigger, {

// Add sprites to the roadsides
        this.populateRoadSide(1);
        this.populateRoadSide(-1);
        
        // Ghost cars representing medal cutoffs
        // TODO: Make seperate class, support lines in addition to cars
        this.medalCars = [];
        var names = ['Gold', 'Silver', 'Bronze']
        var hacks = ['goldZ', 'silverZ', 'bronzeZ']
        for(var i=0; i<3; i+= 1) {
            opts['content'] = new cocos.nodes.Sprite({file: '/resources/Cars/car'+names[i]+'01.png'});
            this.medalCars[i] = new PNode(opts)
            this.medalCars[i].zVelocity = RC.finishLine / RC.times[i+1];
            
            events.addListener(this.medalCars[i], 'addMe', this.addMeHandler);
            events.addListener(this.medalCars[i], 'removeMe', this.removeMeHandler);
            this.medalCars[i].delOnDrop = false;
            
            //HACK: Should be a cleaner way of doing this instead of a straight bypass
            this.medalCars[i].dash    = this.dash;
            this.medalCars[i].dashStr = hacks[i];
            //ENDHACK
        }
        
        if(!this.skipSplash) {
            this.splash = new SplashScreen(['/resources/splash.png']);
            events.addListener(this.splash, 'splashScreensCompleted', this.splashCallback.bind(this));;
            this.splash.zOrder = 110;
            this.addChild({child: this.splash});
            this.splash.start();
        }
        else {

})(); 
    
    // Setup the director
    var director = cocos.Director.get('sharedDirector');
    director.attachInView(document.getElementById('cocos_test_app'));
    
    var scene = cocos.nodes.Scene.create();     // Create a scene
    var app = FluencyApp.create();              // Create the layers
    var menu = MenuLayer.create();
    
    // Allow the App layer to directly access the UI layer
    app.set('menuLayer', menu);
    
    // Set up inter-layer events
    events.addListener(app, 'loaded', menu.createMenu.bind(menu));
    
    events.addListener(menu, 'startGameEvent', app.startGame.bind(app));
    events.addListener(menu, 'muteAudioEvent', app.muteAudioHandler.bind(app));
    events.addListener(menu, 'muteMusicEvent', app.muteMusicHandler.bind(app));
    
    // Add our layers to the scene
    scene.addChild({child: app});
    scene.addChild({child: menu});
    
    // Run the scene
    director.runWithScene(scene);
};

fBound.prototype = new fNOP();

            return fBound;
        };
    }
    
    // Setup the director
    var director = cocos.Director.get('sharedDirector');
    director.attachInView(document.getElementById('cocos_test_app'));
    
    var scene = cocos.nodes.Scene.create();     // Create a scene
    var app = FluencyApp.create();              // Create the layers
    var menu = MenuLayer.create();
    
    // Set up inter-layer events
    events.addListener(app, 'loaded', menu.createMenu.bind(menu));
    
    events.addListener(menu, 'startGameEvent', app.countdown.bind(app));
    events.addListener(menu, 'muteAudioEvent', app.muteAudioHandler.bind(app));
    events.addListener(menu, 'muteMusicEvent', app.muteMusicHandler.bind(app));
    
    // Add our layers to the scene
    scene.addChild({child: app});
    scene.addChild({child: menu});
    
    // Allow the App layer to directly access the UI layer
    app.set('menuLayer', menu);
    app.set('scene', scene);
    
    // Run the scene
    director.runWithScene(scene);
};

var IncludeTrigger = function(opts) {
    IncludeTrigger.superclass.constructor.call(this, opts);
    this.getOpt('path', opts);
    events.addListener(eventRelay, 'IncludeTriggerEvent', this.handle.bind(this));
}
IncludeTrigger.inherit(Trigger, {

addMeHandler: function (toAdd) {
        this.addChild({child: toAdd});
        events.addListener(toAdd, 'removeMe', this.removeMeHandler);
    },

triggerFloatText: function(amt) {
        var color = '#009900'
        var prefix = '+';
        if(amt < 0) {
            color = '#CC0000'
            prefix = '';
        }
        
        var ft = FloatText.create({string: prefix + amt, fontColor: color, fontSize: '34', fontName: MAC.font})
        ft.set('position', new geo.Point(850, 585));
        ft.set('zOrder', 10);
        events.addListener(ft, 'onFinish', this.removeFloatText);
        
        this.addChild({child: ft});
    },

scriptedBindings: function() {
        events.addListener(ER, 'HideMedalCarEvent',         this.scriptedHideMedalCar.bind(this));
        events.addListener(ER, 'LockAbsoluteLaneEvent',     this.scriptedLockAbsoluteLane.bind(this));
        events.addListener(ER, 'LockVelocityEvent',         this.scriptedLockVelocity.bind(this));
        events.addListener(ER, 'RevertVelocityEvent',       this.scriptedRevertVelocity.bind(this));
        events.addListener(ER, 'SetAbsoluteLaneEvent',      this.scriptedSetAbsoluteLane.bind(this));
        events.addListener(ER, 'SetVelocityEvent',          this.scriptedSetVelocity.bind(this));
        events.addListener(ER, 'ShowMedalCarEvent',         this.scriptedShowMedalCar.bind(this));
        events.addListener(ER, 'StartTimerEvent',           this.scriptedStartTimer.bind(this));
        events.addListener(ER, 'StopTimerEvent',            this.scriptedStopTimer.bind(this));
        events.addListener(ER, 'UnlockAbsoluteLaneEvent',   this.scriptedUnlockAbsoluteLane.bind(this));
        events.addListener(ER, 'UnlockVelocityEvent',       this.scriptedUnlockVelocity.bind(this));
    },

slideLabelIn: function (l, d) {
        this.addChild({child: l});
        var a = new cocos.actions.MoveTo({position: new geo.Point(15, l.position.y), duration: d});
        a.startWithTarget(l);
        l.runAction(a);
        
        events.addListener(a, 'actionComplete', this._actionComplete);
    },

totalLabelUp: function(label, link, value, duration) {
        this.addChild({child: label});
        
        var m = MOT.create(0, value, duration);
        m.bind(this, link);
        
        events.addListener(m, 'Completed', this._actionComplete);
    },