Actionscript 3 持续接收错误：访问AS3中未定义的属性菜单

我正在学习AS3使用flash develop创建pong克隆的教程（），但在显示主菜单时遇到了问题。我以前有一个功能正常的原型，带有一个移动的拨片，所以我相信错误出现在我修改过的（或新的）主菜单、主菜单、PongGame或CustomEvents文件中。当我按照教程的指示运行代码时，我收到了错误；在my Main.as文件中访问未定义的属性菜单：

 package 
    {
        import flash.display.Sprite;
    import flash.events.Event;

    /**
     * ...
     * @author 
     */
    public class Main extends Sprite 
    {

        private var game:PongGame;
        ****private var menu:MainMenu;****

    public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }

        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point

        }

        private function buildMenu():void {
            menu = new MainMenu();
            addChild(menu);
            menu.addEventListener(CustomEvents.LAUNCH_GAME, startGame, false, 0, true);
        }

        private function startGame(e:CustomEvents):void {
            removeChild(menu);
            menu.removeEventListener(CustomEvents.LAUNCH_GAME, startGame);
            menu = null;
            game = new PongGame();
            addChild(game);
        }
    }
    }

所以我添加了“private-var-menu:MainMenu；”部分，但我不知道引用哪个类/.as文件？或如何定义变量菜单：

很抱歉附加了大量代码。我没有改变桨。因为这是最长的文件

资产负债表 划桨 蓬盖马斯 CustomEvents.as

---

我不确定从这里到哪里去修复这个错误。任何帮助都将不胜感激

尽管您已正确添加了menu属性，但由于从未调用

buildMenu（）

函数，因此从未显示该菜单

从主类

init（）

，调用

buildMenu（）

实例化并将

菜单添加到后台：

Main.as

private function init(e:Event = null):void 
{
    removeEventListener(Event.ADDED_TO_STAGE, init);

    // entry point
    buildMenu();
}

如果所有类都驻留在同一个包中，那么代码应该可以工作。添加菜单后，您会收到什么错误？还请注意，您的“CustomEvent.as”类应该是：“CustomEvents.as”事件是一个打字错误，已修复。我没有收到实际错误，但只显示了我的背景。我正在使用的教程没有*'d var菜单，这是当我收到一个错误时。所以，我添加了var菜单，但是没有显示任何内容，我不确定我是否纠正了它。没有错误，只是现在没有显示任何内容！我认为buildMenu从未被调用过，这很奇怪，但我不知道该在哪里调用它。我的教程中一定有错误。谢谢
package 

{
    import flash.display.Bitmap;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    public class Paddle extends Sprite {
        private var pic:Bitmap = new Assets.Pad();
        public function Paddle():void {
            addEventListener(Event.ADDED_TO_STAGE, go);
        }
        private function die(e:Event):void {
            removeChild(pic);
            pic = null;
            stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);
            stage.removeEventListener(KeyboardEvent.KEY_UP, keyUpHandler);
            removeEventListener(Event.ENTER_FRAME, enterFrame);
            removeEventListener(Event.REMOVED_FROM_STAGE, die);
        }

    private function go(e:Event) : void {
        removeEventListener(Event.ADDED_TO_STAGE, go);
        addChild(pic); 
            y = stage.stageHeight - pic.height;
            x = stage.stageWidth * .5 - pic.width * .5;
        stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler, false, 0, true);
        stage.addEventListener(KeyboardEvent.KEY_UP, keyUpHandler, false, 0, true);
        addEventListener(Event.ENTER_FRAME, enterFrame, false, 0, true);
        addEventListener(Event.REMOVED_FROM_STAGE, die);
        }

    private var movingLeft:Boolean; 
    private var movingRight:Boolean;

    private function enterFrame(e:Event):void {
        if (movingLeft) {
            if(x-speed >= 0) {
                x -= speed;
        }
            else {
                x = 0;
            }
        }
        else if (movingRight) {
            if (x + speed + pic.width <= 600) {
                x += speed;
            }
            else {
                x = 600 - pic.width;
            }
        }
    }
    private var speed:int = 10;



    private function keyDownHandler(e:KeyboardEvent):void {
        if (e.keyCode == 38 || e.keyCode == 87) {
        if  (!movingLeft) {
            movingLeft = true;
            }
        }
        else if (e.keyCode == 40 || e.keyCode == 83) {
            if (!movingRight) {
                movingRight = true;
                }
            }
        }


    private function keyUpHandler(e:KeyboardEvent):void {
        if (e.keyCode == 38 || e.keyCode == 87) {
            if (movingLeft) {
                movingLeft = false;
            }
        }
        if (e.keyCode == 40 || e.keyCode == 83) {
            if (movingRight) {
                movingRight = false;
            }
        }

    }

    }
    }

package 

{
    import flash.events.Event;
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.events.MouseEvent;


    public class MainMenu extends Sprite
    {
        private var pongButton:Sprite;

        public function MainMenu():void{
            addEventListener(Event.ADDED_TO_STAGE, go);
        }

        private function go(e:Event):void {
            removeEventListener(Event.ADDED_TO_STAGE, go);
            pongButton = item("Play", 20, 30, launchGame, 0xFF0000);
            addChild(pongButton);
        }

        private function launchGame(e:MouseEvent):void {
            dispatchEvent(new CustomEvents(CustomEvents.LAUNCH_GAME));
        }

        private function item(buttonText:String, X:int, Y:int, Funct:Function, txtColor:uint = 0xFFFFFF):Sprite {
            var item:Sprite = new Sprite();
            item.graphics.beginFill(0);
            item.graphics.lineStyle(1, txtColor, .5);
            item.graphics.drawRect(0, 0, 250, 30);
            var myText:TextField = new TextField();
            myText.selectable = false;
            myText.width = 250;
            myText.height = 30;
            item.addChild(myText);
            myText.autoSize = "center";
            myText.text = buttonText;
            myText.textColor = txtColor;
            item.addEventListener(MouseEvent.CLICK, Funct);
            item.x = X;
            item.y = Y;
            return item;
        }

    }

}

package 
{
    import flash.display.Sprite;
    import flash.events.Event;

    public class PongGame extends Sprite
    {
        private var paddle:Paddle;

        public function PongGame():void {
            addEventListener(Event.ADDED_TO_STAGE, go);
        }

        private function go(e:Event):void {
            removeEventListener(Event.ADDED_TO_STAGE, go);
            paddle = new Paddle();

            addChild(paddle);
        }
    }

}

package 
{
    import flash.events.Event;

    public class  CustomEvents extends Event
    {
        public static const LAUNCH_GAME:String = "launch_game";

        public function CustomEvents(e:String):void {
            super(e);
        }

    }

}

private function init(e:Event = null):void 
{
    removeEventListener(Event.ADDED_TO_STAGE, init);

    // entry point
    buildMenu();
}