Failed set other label's background color within for loop

Hi Guys ,

i'm not understand why can't set other labels' background color.

I was able to set the background color which the label was clicked by me. Below is my code , anyone could correct my wrong ?

var sizelbl = [];
var item_clicked;
 
                for (var i = 0; i < jsonParse['item'].length; i++) {
                    var item_id = jsonParse['item'][i]['id'];
                    var item_name = jsonParse['item'][i]['name'];
 
 
                    sizelbl[i] = Ti.UI.createLabel({
                            item_id : item_id,
                        textAlign : 'center',
                        borderRadius : 5,
                        top : '15%',
                        bottom : '15%',
                        left : '2%',
                        width : '16.5%',
                        height : '65%',
                        color : '#fff',
                        backgroundColor : '#000',
                        text : item_name,
                    });
                    $.Scroll.add(sizelbl[i]);
 
                    sizelbl[i].addEventListener('singletap', function(e) {
                        item_clicked = e.source.text;
 
                        if (item_clicked) {
                            sizelbl[i].setBackgroundColor('#eee');
 
                        }else if (!item_clicked) {
                            sizelbl.setBackgroundColor('#000');
                        }
 
                    });
                }