我正在使用我在Google上找到的教程 - 效果很好。但是，我有一些问题要让它按照我的意愿运作。我试着让第二张卡片在短时间内挂起，所以当有比赛时，小孩（球员）可以看到比赛。不幸的是，我的代码给了我TypeError：错误＃2007：我的匹配名称中的参数child必须是非null运行时错误，当我在删除该组之前点击一张新卡时，匹配的一对被转回并且新点击的卡已移除。 （在其自己的）。我很感激任何帮助...
这是错误，然后是我的代码：
TypeError: Error : Parameter child must be non-null.
at flash.display::DisplayObjectContainer/removeChild()
at MatchingGameObject9/remove_tiles()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at flash.utils::Timer/tick()
package {
import flash.display.*;
import flash.events.*;
import flash.text.*;
import flash.utils.getTimer;
import flash.utils.Timer;
public class MatchingGameObject9 extends MovieClip {
// game constants
private static const boardWidth:uint = 6;
private static const boardHeight:uint = 5;
private static const cardHorizontalSpacing:Number = 87;
private static const cardVerticalSpacing:Number = 87;
private static const boardOffsetX:Number = 20;
private static const boardOffsetY:Number = 45;
private static const pointsForMatch:int = 100;
private static const pointsForMiss:int = -5;
private var firstCard:Card;
private var secondCard:Card;
private var cardsLeft:uint;
private var gameScore:int;
private var gameStartTime:uint;
private var gameTime:uint;
private var pause_timer:Timer;
private var gameScoreField:TextField;
private var gameTimeField:TextField;
public function MatchingGameObject9():void {
// make a list of card numbers
var cardlist:Array = new Array();
for(var i:uint=0;i<boardWidth*boardHeight;i++) {
cardlist.push(i);
}
// create all the cards, position them, and assign a randomcard face to each
cardsLeft = 0;
for(var x:uint=0;x<boardWidth;x++) { // horizontal
for(var y:uint=0;y<boardHeight;y++) { // vertical
var c:Card = new Card(); // copy the movie clip
c.stop(); // stop on first frame
c.x = x*cardHorizontalSpacing+boardOffsetX; // set position
c.y = y*cardVerticalSpacing+boardOffsetY;
var r:uint = Math.floor(Math.random()*cardlist.length); // get a random face
c.cardface = cardlist[r]; // assign face to card
cardlist.splice(r,1); // remove face from list
c.addEventListener(MouseEvent.CLICK,clickCard); // have it listen for clicks
c.buttonMode = true;
addChild(c); // show the card
cardsLeft++;
}
}
gameScoreField = new TextField();
addChild(gameScoreField);
gameScore = 0;
showGameScore();
gameTimeField = new TextField();
gameTimeField.x = 450;
addChild(gameTimeField);
gameStartTime = getTimer();
gameTime = 0;
addEventListener(Event.ENTER_FRAME,showTime);
}
// player clicked on a card
public function clickCard(event:MouseEvent) {
var thisCard:Card = (event.target as Card); // what card?
if (firstCard == null) { // first card in a pair
firstCard = thisCard; // note it
firstCard.gotoAndStop(thisCard.cardface+2); // turn it over
} else if (firstCard == thisCard) { // clicked first card again
firstCard.gotoAndStop(1); // turn back over
firstCard = null;
} else if (secondCard == null) { // second card in a pair
secondCard = thisCard; // note it
secondCard.gotoAndStop(thisCard.cardface+2); // turn it over
// compare two cards
if (Math.floor(firstCard.cardface/2) == Math.floor(secondCard.cardface/2)) {
**pause_timer = new Timer(2000,1);
pause_timer.addEventListener(TimerEvent.TIMER_COMPLETE,remove_tiles);
pause_timer.start();**
}
} else { // starting to pick another pair
// reset previous pair
firstCard.gotoAndStop(1);
secondCard.gotoAndStop(1);
secondCard = null;
// select first card in next pair
firstCard = thisCard;
firstCard.gotoAndStop(thisCard.cardface+2);
}
}
public function showGameScore() {
gameScoreField.text = "ΣΚΟΡ: "+String(gameScore);
}
public function showTime(event:Event) {
gameTime = getTimer()-gameStartTime;
gameTimeField.text = "ΧΡΟΝΟΣ: "+clockTime(gameTime);
}
public function clockTime(ms:int) {
var seconds:int = Math.floor(ms/1000);
var minutes:int = Math.floor(seconds/60);
seconds -= minutes*60;
var timeString:String = minutes+":"+String(seconds+100).substr(1,2);
return timeString;
}
**public function remove_tiles(event:TimerEvent) {
removeChild(firstCard);
removeChild(secondCard);
// reset selection
firstCard = null;
secondCard = null;
// add points
gameScore += pointsForMatch;
showGameScore();
// check for game over
cardsLeft -= 2; // 2 less cards
if (cardsLeft == 0) {
MovieClip(root).gameScore = gameScore;
MovieClip(root).gameTime = clockTime(gameTime);
MovieClip(root).gotoAndStop("gameover");
pause_timer.removeEventListener(TimerEvent.TIMER_COMPLETE,remove_tiles);
} else {
gameScore += pointsForMiss;
showGameScore();
}**
}
}
答案 0 :(得分：2)
我认为您需要以不同方式组织删除。类似的东西：
var removalQueue:Array = new Array;
addEventListener(Event.ENTER_FRAME, onRemove);
function onRemove(e:Event):void
{
if (!removalQueue.length) return;
var anEntry:Object = removalQueue[0];
if (getTimer() < anEntry['time']) return;
// Delete entry from queue.
removalQueue.shift();
removeChild(anEntry['first']);
removeChild(anEntry['second']);
gameScore += anEntry['score'];
cardsLeft -= 2;
// The rest of your code...
}
因此，如果您有两张匹配的卡片，则只需将适当的条目推送到队列：
var anEntry:Object =
{
"time": getTimer() + 2000,
"first": firstCard,
"second": secondCard,
"score": pointsForMatch
}
removalQueue.push(anEntry);