สอบถามเรือ่งการสร้าง Array ใน Javascript ครับ มีตัวอย่างด้านในครับ

if(statusRoom=="A"){

			var selectArray = new Array();
			var	compareArray = new Array();
			var CountArray = new Array();

			for (i=0; i<cpt; i++) {		
				
				var incr = parseInt(i);		
				var divRoomType_tosend 	= document.getElementById('RoomType_tosend['+incr+']').value;
				var divRoomTypeTopax_tosend = document.getElementById('RoomTypeTopax_tosend['+incr+']').value;	
				var nbr_rooms = document.getElementById('nbr_rooms['+incr+']').value;
				var MaxRommTopax = document.getElementById('maxRoomAvailable['+incr+']').value;

				if (divRoomType_tosend !="") {	
					if(selectArray[divRoomTypeTopax_tosend]==undefined){
						selectArray[divRoomTypeTopax_tosend] = parseInt(nbr_rooms);
						compareArray[divRoomTypeTopax_tosend] = parseInt(MaxRommTopax);
						CountArray[incr] = divRoomTypeTopax_tosend;
					}else{
						selectArray[divRoomTypeTopax_tosend] = parseInt(selectArray[divRoomTypeTopax_tosend]) + parseInt(nbr_rooms);
					}
				}
			}

			for(var a=0; a<CountArray.length; a++){
				
				var index = CountArray[a];

				if(selectArray[index] > compareArray[index]){				
					statusRoom = "R";
				}
			}
		}