blinking movieclip with timer

i am trying to make my movieclip blink, it blinks when it is hit by something, to create the effect of a game.i have a hit test when it is hitted, caught is called on the object.the caught function of the object will make it stop and start to blink based on a timer.My timer is set on new Timer(400); why does my object not blink? my conditions seem to be correct.

if (hit.hitTestObject(f.hit))
    f.caught();


    private function blinkingHandler(evt:TimerEvent):void
    {

        _canBlink = true;
        if (_canBlink)
        {
            开发者_StackOverflow社区this.alpha = 0;
            _canBlink = false;
            this.alpha = 100;
            trace("blinking");
        }
    }
    public function caught() : void
    {   
        _blinkTimer.start();


        //removeEventListener(Event.ENTER_FRAME, loop);

        //this.stop();
    }

First, I'm going to assume that you have added the event listener to trigger the blinkingHandler call when the Timer fires:

_blinkTimer.addEventListener(TimerEvent.TIMER, blinkingHandler);

Now, blinkingHandler as you have posted it will never hide the object. The alpha is set to 0, but you immediately set it back to 1 in the same call, so the net result is that the alpha does not display at 0. You must set the alpha to 0, let a few frames render, set it back to 1 on the next timer tick, and so on. Try this:

private function blinkingHandler(evt:TimerEvent):void
{
    if(_canBlink) this.alpha = 1;
    else this.alpha = 0;
    _canBlink = !_canBlink;
}

You could even do:

visible = !visible;

To simply toggle the visibility on each timer tick.

var timer:Timer =  new Timer(200);
var blink:Boolean = true;
timer.start();
sq_mc.addEventListener(MouseEvent.MOUSE_OVER, onMseOvrAction);
sq_mc.addEventListener(MouseEvent.MOUSE_OUT, onMseOutAction);
function onMseOvrAction(e:MouseEvent):void{
    timer.addEventListener(TimerEvent.TIMER, timerAction);
}
function onMseOutAction(e:MouseEvent):void{
    timer.removeEventListener(TimerEvent.TIMER, timerAction);
    sq_mc.alpha = 1;
}
function timerAction(e:TimerEvent):void
{
    if (!blink){
        sq_mc.alpha = 1;
    } else{
        sq_mc.alpha = 0;
    }
    blink = !blink;
}

Mr.Allan, I have changed.