如何阻止hittestobject進入另一個框架？ FLASH AS3

Question

我正在創建一個帶有hittestobject的拖放遊戲，但是當按下後退按鈕時，拖放遊戲的標籤仍然顯示在背框上。按下後退按鈕之前是否必須重置遊戲？

代碼：

right_mc.visible=false; 
wrong_mc.visible=false; 

var orig1X:Number=frog_mc.x; 
var orig1Y:Number=frog_mc.y; 
var orig2X:Number=queen_mc.x; 
var orig2Y:Number=queen_mc.y; 
var orig3X:Number=apple_mc.x; 
var orig3Y:Number=apple_mc.y; 

frog_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragTheObject); 
frog_mc.addEventListener(MouseEvent.MOUSE_UP, frog_mcRelease); 
queen_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragTheObject); 
queen_mc.addEventListener(MouseEvent.MOUSE_UP, queen_mcRelease); 
apple_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragTheObject);  
apple_mc.addEventListener(MouseEvent.MOUSE_UP, apple_mcRelease);  

done_btn.addEventListener(MouseEvent.CLICK, checkAnswers);  
reset_btn.addEventListener(MouseEvent.CLICK, reset); 

frog_mc.buttonMode=true;  
queen_mc.buttonMode=true;  
apple_mc.buttonMode=true; 

function dragTheObject(event:MouseEvent):void { 
    var item:MovieClip=MovieClip(event.target); 
    item.startDrag(); 
    var topPos:uint=this.numChildren-1; 
    this.setChildIndex(item, topPos);  
} 


function frog_mcRelease(event:MouseEvent):void { 
    var item:MovieClip=MovieClip(event.target); 
    item.stopDrag();  
    if (drop_frog.hitTestPoint(item.x,item.y)) { 
     item.x=drop_frog.x; 
     item.y=drop_frog.y; 
    } else { 
     item.x=orig1X; 
     item.y=orig1Y; 
    } 
};  

function queen_mcRelease(event:MouseEvent):void { 
    var item:MovieClip=MovieClip(event.target); 
    item.stopDrag(); 
    if (drop_queen.hitTestPoint(item.x,item.y)) { 
     item.x=drop_queen.x; 
     item.y=drop_queen.y; 
    } else { 
     item.x=orig2X; 
     item.y=orig2Y; 
    } 
};  

function apple_mcRelease(event:MouseEvent):void { 
    var item:MovieClip=MovieClip(event.target); 
    item.stopDrag(); 
    if (drop_apple.hitTestPoint(item.x,item.y)) { 
     item.x=drop_apple.x; 
     item.y=drop_apple.y; 
    } else { 
     item.x=orig3X; 
     item.y=orig3Y; 
    } 
}; 

function checkAnswers(event:MouseEvent):void { 
    if (drop_frog.hitTestPoint(frog_mc.x,frog_mc.y) && 
      drop_queen.hitTestPoint(queen_mc.x,queen_mc.y) && 
      drop_apple.hitTestPoint(apple_mc.x,apple_mc.y)) { 
     wrong_mc.visible = false; 
     right_mc.visible = true; 
    } else { 
     wrong_mc.visible = true; 
     right_mc.visible = false; 
    } 
} 

function reset(event:MouseEvent):void { 
    frog_mc.x=orig1X; 
    frog_mc.y=orig1Y;  
    queen_mc.x=orig2X; 
    queen_mc.y=orig2Y; 
    apple_mc.x=orig3X; 
    apple_mc.y=orig3Y; 

    right_mc.visible=false; 
    wrong_mc.visible=false; 
} 

Answer 1

理想情況下，你需要的時候你回去刪除所有事件偵聽器。如果您通過另一個的addChild命令添加了一些孩子，則必須刪除聊天孩子。你是如何在屏幕上添加「拖放遊戲的標籤」的？