不运用正则排除出现的特定数的数字

import flash.utils.Timer;
import flash.events.TimerEvent;

var time:Timer = new Timer(1);
time.addEventListener(TimerEvent.TIMER,timeHandler);
time.start();
var i:int = 0;
var str:String;
function timeHandler(e:TimerEvent):void
{
	i++;
	str = String(i);
	if (str.indexOf("4") != -1)
	{
		trace(i+"----出现4");
	}
	else
	{
		trace(i);
	}
}