所以我得到一个错误，说明提供的DisplayObject必须是调用者的子代。发生的事情是我的游戏第一次工作，点击'Play'按钮调用startGame功能并删除菜单以便显示游戏，但随后在游戏结束时playAgainBtn单击1}}，而不是简单地再次玩游戏/重新启动游戏，我收到此错误：
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display::DisplayObjectContainer/removeChild()
具体指向这一行：
menuLayer.removeChild(mainMenu);
以下是代码：
package {
import flash.display.MovieClip;
import flash.display.LoaderInfo;
import flash.display.Sprite;
import flash.display.DisplayObject;
import flash.display.Stage;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.events.TimerEvent;
import flash.utils.Timer;
import flash.ui.Mouse;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.text.TextFormat;
import flash.text.TextField;
import flash.text.AntiAliasType;
import flash.display.Loader;
import flash.net.URLRequest;
import flash.net.URLLoader;
import flash.system.LoaderContext;
import flash.display.Sprite;
import flash.net.Socket;
import caurina.transitions.Tweener;
import flash.text.Font;
public class Main extends MovieClip {
public static var backgroundLayer:Sprite = new Sprite;
public static var gameLayer:Sprite = new Sprite;
public static var interfaceLayer:Sprite = new Sprite;
public static var endGameLayer:Sprite = new Sprite;
public static var menuLayer:Sprite = new Sprite;
public static var gameOverLayer:Sprite = new Sprite;
public static var howToLayer:Sprite = new Sprite;
public static var scoresLayer:Sprite = new Sprite;
public static var aboutLayer:Sprite = new Sprite;
public var mainMenu:menuMain = new menuMain;
public var gameEnd:endGame = new endGame;
public var howtoPlay:howToPlay = new howToPlay;
public var gameAbout:aboutGame = new aboutGame;
public var intro:IntroSound = new IntroSound();
public var soundControl:SoundChannel = new SoundChannel();
public var gameTime:int;
public var levelDuration:int;
public var crosshair:crosshair_mc;
static var score:Number;
var enemyShipTimer:Timer;
var enemyShipTimerMed:Timer;
var enemyShipTimerSmall:Timer;
static var scoreHeader:TextField = new TextField();
static var scoreText:TextField = new TextField();
static var timeHeader:TextField = new TextField();
static var timeText:TextField = new TextField();
static var scoreFormat = new TextFormat("Arial Rounded MT Bold", 20, 0xFFFFFF);
public var gameOverscoreFormat = new TextFormat("Arial Rounded MT Bold", 32, 0xFFFFFF);
public function Main()
{
addChild(gameLayer);
addChild(backgroundLayer);
addChild(interfaceLayer);
addChild(menuLayer);
menuLayer.addChild(mainMenu);
interfaceLayer.addChild(howtoPlay);
interfaceLayer.addChild(gameEnd);
interfaceLayer.addChild(gameAbout);
soundControl = intro.play(0, 100);
addMenuListeners();
}
public function menuReturn(e:Event)
{
addChild(gameLayer);
addChild(backgroundLayer);
addChild(interfaceLayer);
addChild(menuLayer);
menuLayer.addChild(mainMenu);
interfaceLayer.addChild(howtoPlay);
interfaceLayer.addChild(gameEnd);
interfaceLayer.addChild(gameAbout);
}
public function showAbout(e:Event)
{
menuLayer.removeChild(mainMenu);
interfaceLayer.addChild(gameAbout);
}
public function startGame(e:Event)
{
removeMenuListeners();
soundControl.stop();
interfaceLayer.removeChild(howtoPlay);
interfaceLayer.removeChild(gameAbout);
interfaceLayer.removeChild(gameEnd);
menuLayer.removeChild(mainMenu);
levelDuration = 30;
gameTime = levelDuration;
var gameTimer:Timer = new Timer(1000,levelDuration);
gameTimer.addEventListener(TimerEvent.TIMER, updateTime);
gameTimer.addEventListener(TimerEvent.TIMER_COMPLETE, timeExpired)
gameTimer.start();
scoreHeader = new TextField();
scoreHeader.text = String("Score: ");
interfaceLayer.addChild(scoreHeader);
scoreHeader.x = 5;
scoreHeader.selectable = false;
scoreHeader.embedFonts = true;
scoreHeader.antiAliasType = AntiAliasType.ADVANCED;
scoreText = new TextField();
scoreText.text = String("0");
interfaceLayer.addChild(scoreText);
scoreText.x = 75;
scoreText.y = 0;
scoreText.selectable = false;
scoreText.embedFonts = true;
scoreText.antiAliasType = AntiAliasType.ADVANCED;
timeHeader = new TextField();
timeHeader.text = String("Time: ");
interfaceLayer.addChild(timeHeader);
timeHeader.x = 500;
timeHeader.y = 0;
timeHeader.selectable = false;
timeHeader.embedFonts = true;
timeHeader.antiAliasType = AntiAliasType.ADVANCED;
timeText = new TextField();
timeText.text = gameTime.toString();
interfaceLayer.addChild(timeText);
timeText.x = 558;
timeText.y = 0;
timeText.selectable = false;
timeText.embedFonts = true;
timeText.antiAliasType = AntiAliasType.ADVANCED;
scoreHeader.setTextFormat(scoreFormat);
scoreText.setTextFormat(scoreFormat);
timeHeader.setTextFormat(scoreFormat);
timeText.setTextFormat(scoreFormat);
var timeScorebg:Sprite = new Sprite();
backgroundLayer.addChild(timeScorebg);
timeScorebg.graphics.beginFill(0x333333);
timeScorebg.graphics.drawRect(0,0,600,30);
timeScorebg.graphics.endFill();
timeScorebg.y = 0;
enemyShipTimer = new Timer(2000);
enemyShipTimer.addEventListener("timer", sendEnemy);
enemyShipTimer.start();
enemyShipTimerMed = new Timer(2500);
enemyShipTimerMed.addEventListener("timer", sendEnemyMed);
enemyShipTimerMed.start();
enemyShipTimerSmall = new Timer(2750);
enemyShipTimerSmall.addEventListener("timer", sendEnemySmall);
enemyShipTimerSmall.start();
crosshair = new crosshair_mc();
gameLayer.addChild(crosshair);
crosshair.mouseEnabled = crosshair.mouseChildren = false;
Mouse.hide();
gameLayer.addEventListener(Event.ENTER_FRAME, moveCursor);
resetScore();
}
function addMenuListeners():void
{
mainMenu.playBtn.addEventListener(MouseEvent.CLICK, startGame);
mainMenu.howToPlayBtn.addEventListener(MouseEvent.CLICK, showInstructions);
mainMenu.aboutBtn.addEventListener(MouseEvent.CLICK, showAbout);
howtoPlay.backBtn.addEventListener(MouseEvent.CLICK, menuReturn);
gameEnd.playagainBtn.addEventListener(MouseEvent.CLICK, startGame);
gameAbout.backBtn.addEventListener(MouseEvent.CLICK, menuReturn);
}
function removeMenuListeners():void
{
mainMenu.playBtn.removeEventListener(MouseEvent.CLICK, startGame);
mainMenu.howToPlayBtn.removeEventListener(MouseEvent.CLICK, showInstructions);
mainMenu.aboutBtn.removeEventListener(MouseEvent.CLICK, showAbout);
howtoPlay.backBtn.removeEventListener(MouseEvent.CLICK, menuReturn);
gameEnd.playagainBtn.removeEventListener(MouseEvent.CLICK, startGame);
gameAbout.backBtn.removeEventListener(MouseEvent.CLICK, menuReturn);
}
public function showInstructions(e:Event)
{
menuLayer.removeChild(mainMenu);
interfaceLayer.addChild(howtoPlay);
}
function sendEnemy(e:Event)
{
var enemy = new EnemyShip();
gameLayer.addChild(enemy);
gameLayer.addChild(crosshair);
}
function sendEnemyMed(e:Event)
{
var enemymed = new EnemyShipMed();
gameLayer.addChild(enemymed);
gameLayer.addChild(crosshair);
}
function sendEnemySmall(e:Event)
{
var enemysmall = new EnemyShipSmall();
gameLayer.addChild(enemysmall);
gameLayer.addChild(crosshair);
}
static function updateScore(points)
{
score += points;
scoreText.text = String(score);
scoreHeader.setTextFormat(scoreFormat);
scoreText.setTextFormat(scoreFormat);
}
static function resetScore()
{
score = 0;
scoreText.text = String(score);
scoreText.setTextFormat(scoreFormat);
}
function updateTime(e:TimerEvent):void
{
gameTime--;
timeText.defaultTextFormat = scoreFormat;
timeText.text = String(gameTime);
}
function timeExpired(e:TimerEvent):void
{
var gameTimer:Timer = e.target as Timer;
gameTimer.removeEventListener(TimerEvent.TIMER, updateTime)
gameTimer.removeEventListener(TimerEvent.TIMER, timeExpired)
interfaceLayer.addChild(gameEnd);
var thisFont:Font = new myFont();
var myFormat:TextFormat = new TextFormat();
myFormat.font = thisFont.fontName;
scoreText = new TextField();
scoreText.defaultTextFormat = myFormat;
scoreText.text = String(score);
interfaceLayer.addChild(scoreText);
scoreText.x = 278;
scoreText.y = 180;
scoreText.selectable = false;
scoreText.embedFonts = true;
scoreText.antiAliasType = AntiAliasType.ADVANCED;
scoreText.setTextFormat(gameOverscoreFormat);
Mouse.show();
removeChild(gameLayer);
addMenuListeners();
}
function moveCursor(event:Event)
{
crosshair.x=mouseX;
crosshair.y=mouseY;
}
}
}
我不太确定如何解决这个问题，因此欢迎任何建议或解决方案。我不能让它以我想要的方式工作而不会出错。
感谢。
答案 0 :(得分：1)
我认为问题是在第二次播放时调用menuLayer.removeChild(mainMenu);会导致错误，因为您已经将其删除了一次。最快的解决方案是在您尝试删除之前检查menuLayer是否包含mainMenu：
if(menuLayer contains mainMenu)
menuLayer.removeChild(mainMenu);
（请注意，我现在无法访问IDE，但我认为这应该有效）
更强大的解决方案是在从主菜单中单击播放按钮时调用不同的方法，从mainMenu中删除menuLayer，然后调用startGame（其中为{{ 1}}直接调用playAgain。
修改 好的，我明白你的意思了。也许是这样的事情：
startGame答案 1 :(得分：0)
我不知道为什么你的代码不能正常工作，但是没有必要担心，请尝试：
MovieClip(menuLayer.parent).removeChild(menuLayer);
答案 2 :(得分：0)
您在两个不同的位置删除mainMenu。我的猜测是它被删除一次，然后再被删除。
if ( mainMenu.parent == menuLayer ) {
menuLayer.removeChild( mainMenu );
}
这将验证mainMenu在删除之前实际上是menuLayer的子节点。您无法从父实际上不是父项的父项中删除子项。想象一下，州政府带走了一个孩子并从绑架者手中接过他们的监护权。这不是最漂亮的比较，但它给出了正确的想法。
答案 3 :(得分：0)
如果没有看到如何处理游戏，我无法验证这一点，但我认为可能的问题是，每次玩游戏时你都不会删除你的事件监听器。因此，当您返回主菜单并再次添加它们时，您现在可以使用playAgainBtn的两个侦听器。
所以当你结束游戏并点击playAgainBtn时，startGame会被称为TWICE。所以第一次将它移除就好了，第二次 - 没有什么可以删除的。根据您当前的设计，所有事件监听器都可能存在此问题。
如果是这种情况，您只需在删除菜单时删除事件侦听器。
我建议无论何时激活菜单，都要添加监听器，然后在隐藏它时将其删除。也许有两个方法，addMenuListeners和removeMenuListeners
您可以创建这两个函数并在适当的地方使用它们：
function addMenuListeners():void
{
mainMenu.playBtn.addEventListener(MouseEvent.CLICK, startGame);
mainMenu.howToPlayBtn.addEventListener(MouseEvent.CLICK, showInstructions);
mainMenu.aboutBtn.addEventListener(MouseEvent.CLICK, showAbout);
howtoPlay.backBtn.addEventListener(MouseEvent.CLICK, menuReturn);
gameEnd.playagainBtn.addEventListener(MouseEvent.CLICK, startGame);
gameAbout.backBtn.addEventListener(MouseEvent.CLICK, menuReturn);
}
function removeMenuListeners():void
{
mainMenu.playBtn.removeEventListener(MouseEvent.CLICK, startGame);
mainMenu.howToPlayBtn.removeEventListener(MouseEvent.CLICK, showInstructions);
mainMenu.aboutBtn.removeEventListener(MouseEvent.CLICK, showAbout);
howtoPlay.backBtn.removeEventListener(MouseEvent.CLICK, menuReturn);
gameEnd.playagainBtn.removeEventListener(MouseEvent.CLICK, startGame);
gameAbout.backBtn.removeEventListener(MouseEvent.CLICK, menuReturn);
}
如果遵循在不使用时始终删除事件侦听器的规则，则可以避免此问题。
答案 4 :(得分：0)
if（mainMenu.parent）{mainmenu.parent.removeChild（mainMenu）;}或者它已经被删除/根本没有添加？
答案 5 :(得分：0)
更改此行
menuLayer.removeChild(mainMenu);
到这个..
if (mainMenu.parent != null && mainMenu.parent == menuLayer)
{
menuLayer.removeChild(mainMenu);
}
希望它会解决。