试着增加你的关键监听器在舞台：

  stage.addEventListener（KeyboardEvent.KEY_DOWN，onPushSpace）;
 

否则，当前类需要成为市场关注焦点，这就是为什么只能直到你点击它。一定要删除，当你的游戏在画面，虽然这样做了听众。

另外，您可以通过code给你的游戏结束画面的焦点，当它加载（在构造函数中）：

 公共职能GameOverScreen（useMouseControl：布尔）{
    this.addEventListener（Event.ADDED_TO_STAGE，addedToStage，假，0，真正的）;

    如果（useMouseControl）{
        Mouse.show（）;
        restartButton.addEventListener（MouseEvent.CLICK，onClickRestart，假，0，真正的）;
    }
    其他{
        this.addEventListener（KeyboardEvent.KEY_DOWN，onPushSpace，假，0，真正的）;
    }
}

私有函数addedToStage（五：事件）：无效{
    stage.focus =这一点;
    stage.stageFocusRect = FALSE; //确保没有愚蠢的黄色矩形
}
 

另外一个小秘密 - 我注意到你没有从显示列表中删除你的游戏屏幕上，一旦它的完成。你要做到这一点，使之真正消失（和删除您重新启动事件侦听器）。

 公共职能restartGame（）：无效{
    播放屏幕=新的播放屏幕（useMouseControl）;
    playScreen.addEventListener（AvatarEvent.DEAD，onAvatarDeath）;
    的addChild（播放屏幕）;

    gameOverScreen.removeEventListener（NavigationEvent.RESTART，onRequestRestart）;
    removeChild之（gameOverScreen）;
    gameOverScreen = NULL;
}
 

I have a class like this:

public class GameOverScreen extends MovieClip {
    public function GameOverScreen(useMouseControl:Boolean) {
        if(useMouseControl){
            Mouse.show();
            restartButton.addEventListener(MouseEvent.CLICK, onClickRestart);
        }
        else{
            this.addEventListener(KeyboardEvent.KEY_DOWN, onPushSpace);
        }
    }

    public function onClickRestart(mouseEvent:MouseEvent):void{
        dispatchEvent(new NavigationEvent(NavigationEvent.RESTART));
    }

    public function onPushSpace(keyboardEvent:KeyboardEvent):void{
        trace(keyboardEvent);
        dispatchEvent(new NavigationEvent(NavigationEvent.RESTART));
    }...

It's an ending screen of a game. (surprise!) I want it to restart my game if I push down the space button, or click on the restartButton on the screen. As you can see the screen gets a boolean value in the constructor, wich decide that we're using keyboard or mouse to control the game. It works well with mouse, but with the key, i have to click on the restart button (wich is on the screen), till it does nothing, and after clicking it, and I push a button I get the playScreen, but my keylistener is somewhy still in work, and if i push any key, it restarts the game.

The point of my main class is: if the player dies, he get a gameOverScreen, and the playscreen will be dismissed, the gameOverScreen also gets a listener, it listens for an event called RESTART, if the event is dispatched, a new playScreen is created, and the game over dismissed.

public class Avoider extends MovieClip { ....
     public function onAvatarDeath(avatarEvent:AvatarEvent):void {

        var finalScore:Number = playScreen.getFinalScore();
        var finalTime:Number = playScreen.getFinalTime();

        gameOverScreen = new GameOverScreen(useMouseControl);
        gameOverScreen.addEventListener(NavigationEvent.RESTART, onRequestRestart);
        gameOverScreen.setFinalScore(finalScore);
        gameOverScreen.setFinalTime(finalTime);
        addChild(gameOverScreen);

        playScreen = null;
    }

    public function restartGame():void {
        playScreen = new PlayScreen(useMouseControl);
        playScreen.addEventListener(AvatarEvent.DEAD, onAvatarDeath);
        addChild(playScreen);

        gameOverScreen = null;
    }

    public function onRequestRestart(navigationEvent:NavigationEvent):void {
        restartGame();
    }

I hope it's understandable, if not please note it what is not clean. Thanks

UPDATE

my onAddToStage function

public function onAddToStage(event: Event):void{
    stage.focus = this;
this.addEventListener(KeyboardEvent.KEY_DOWN, onPushSpace);
    }

Try adding your key listener to the stage:

stage.addEventListener(KeyboardEvent.KEY_DOWN, onPushSpace);

Otherwise your current class needs to be in focus, which is why only works until you've clicked it. Be sure to remove that listener when your game over screen is done though.

Alternatively you could give your game over screen focus through code when it loads (in the constructor):

public function GameOverScreen(useMouseControl:Boolean) {
    this.addEventListener(Event.ADDED_TO_STAGE,addedToStage,false,0,true);

    if(useMouseControl){
        Mouse.show();
        restartButton.addEventListener(MouseEvent.CLICK, onClickRestart, false, 0, true);
    }
    else{
        this.addEventListener(KeyboardEvent.KEY_DOWN, onPushSpace, false, 0, true);
    }
}

private function addedToStage(e:Event):void {
    stage.focus = this;
    stage.stageFocusRect = false;  //make sure there's no dumb yellow rectangle
}

Also a little tip - I notice your not removing your game over screen from the display list once it's finished. You'll want to do that to make it truly go away (and remove your restart event listener).

public function restartGame():void {
    playScreen = new PlayScreen(useMouseControl);
    playScreen.addEventListener(AvatarEvent.DEAD, onAvatarDeath);
    addChild(playScreen);

    gameOverScreen.removeEventListener(NavigationEvent.RESTART, onRequestRestart);
    removeChild(gameOverScreen);
    gameOverScreen = null;
}