添加到舞台后，碰撞代码停止工作

Question

所以我使用了动作脚本3，并且在将代码添加到舞台后，我的碰撞代码停止工作。当触摸墙壁时，玩家根本无法移动。然而，如果我通过将影片剪辑拖到舞台上将其添加到舞台上，它可以正常工作，播放器在触摸墙壁时不会冻结，而是无法通过墙壁，但它可以从墙壁移回。

这是我将其添加到舞台的代码。

public class Main extends MovieClip
{
    var mountains: Mountains;
    var homePage: HomePage;
    var oneManager: OneManager;

    public function Main()
    {
        mountains = new Mountains;
        homePage = new HomePage;
        oneManager = new OneManager;

        addChild(homePage);

        stage.displayState = "fullScreen";

        homePage.playButtons.addEventListener(MouseEvent.CLICK, onPlayButtonsClick);
    }

    function onPlayButtonsClick(event:MouseEvent):void
    {
        stage.focus = stage;

        parent.addChild(oneManager);
        homePage.parent.removeChild(homePage);

    }
}

这是我的代码，它使用碰撞检测来阻止玩家穿越墙壁

private function onKeyDown(event: KeyboardEvent): void
    {
        if (event.keyCode == Keyboard.A)
        {
            vx = -5;
        }
        else if (event.keyCode == Keyboard.D)
        {
            vx = 5;
        }
        else if (event.keyCode == Keyboard.W)
        {
            vy = -5;
        }
        else if (event.keyCode == Keyboard.S)
        {
            vy = 5;
        }
    }

    private function onKeyUp(event: KeyboardEvent): void
    {
        if (event.keyCode == Keyboard.A || event.keyCode == Keyboard.D)
        {
            vx = 0;
        }
        else if (event.keyCode == Keyboard.S || event.keyCode == Keyboard.W)
        {
            vy = 0;
        }
    }

    private function onEnterFrame(event: Event): void
    {
        if (player.collisionArea.hitTestObject(wall))
        {
            player.y -= vy;
        }
    }