gistfile1.txt

import flash.events.KeyboardEvent;

this.stage.addEventListener(KeyboardEvent.KEY_DOWN , onKeyDown) ;

var pastKeyTime : int = -1 ;
var range : int = 2000 ;
var comboCount : int = 0 ;

var queryList : Array = [97,98,99,100,101,102] ;
var queryIndex : int = 0 ;

function onKeyDown(ev : KeyboardEvent = null) : void
{
	trace(ev.keyCode) ;
	
	//if( isTimeOut( getTimer() ) ) 
	if(isQueryOut(ev.keyCode) )
	{
	   comboCount = 0 ;
		
	   trace("reset") ;
	}
	else
	{
		comboCount ++ ;
		
		trace("combo : " + comboCount) ;
	}
}

function isQueryOut(code : int) : Boolean
{
	var result : Boolean = code == queryList[queryIndex] ? false : true ;
	
	trace(result + " " + code + " , " + queryList[queryIndex]) ;
	
	queryIndex ++ ;
	
	if(queryIndex > queryList.length -1 || result)
	{
		queryIndex = 0 ;
	}
	
	return result ;
}

function isTimeOut(nowTime : int) : Boolean
{
	var result : Boolean = nowTime - pastKeyTime > range ? true : false ;
	
	pastKeyTime = nowTime ;
	
	return result ;
}