Actionscript 3：mouse_over＆mouse_out導致錯誤＃1009？

Question

當我將鼠標放在buttonSprite上時，它將displaySprite添加到舞臺上，當我將buttonSprite鼠標移出時，displaySprite被移除。

我的問題是，當我快速地將鼠標移出並移出buttonSprite幾次時，displaySprite不會被刪除，並顯示錯誤消息（錯誤＃1009）。即使我輸入「displaySprite = null」，它仍然不起作用。有什麼建議麼？謝謝

var buttonSprite:Sprite = new Sprite(); 
addChild(buttonSprite); 
buttonSprite.addEventListener(MouseEvent.MOUSE_OVER, overSprite); 

var displaySprite:Sprite; 

function overSprite(e:MouseEvent):void{ 

    displaySprite = new Sprite(); 
    addChild(displaySprite); 
    buttonSprite.addEventListener(MouseEvent.MOUSE_OUT, outSprite); 

} 
function outSprite(e:MouseEvent):void{ 

    removeChild(displaySprite); 
    displaySprite = null; 

} 

Answer 1

這個怎麼樣？

var buttonSprite:Sprite = new Sprite(); 
addChild(buttonSprite); 
buttonSprite.addEventListener(MouseEvent.MOUSE_OVER, overSprite); 
buttonSprite.addEventListener(MouseEvent.MOUSE_OUT, outSprite); 

var displaySprite:Sprite; 
addChild(displaySprite); 
displaySprite.visible=false; 

function overSprite(e:MouseEvent):void 
{ 
    displaySprite.visible = true; 
} 

function outSprite(e:MouseEvent):void 
{ 
    displaySprite.visible = false; 
} 

Answer 2

問題是鼠標懸停在顯示對象上時會多次調度MouseEvent.MOUSE_OVER。你應該嘗試的是MouseEvent.ROLL_OVER和MouseEvent.ROLL_OUT這兩個事件分派一次。

東西線沿線的：

var buttonSprite:Sprite = new Sprite(); 
addChild(buttonSprite); 
buttonSprite.addEventListener(MouseEvent.ROLL_OVER, overSprite); 
buttonSprite.addEventListener(MouseEvent.ROLL_OUT, outSprite); 
var displaySprite:Sprite; 

function overSprite(e:MouseEvent):void 
{ 
    if(!displaySprite) 
    { 
     displaySprite = new Sprite(); 
     addChild(displaySprite); 
    } 

} 

function outSprite(e:MouseEvent):void{ 
    if(displaySprite) 
    { 
     removeChild(displaySprite); 
     displaySprite = null; 
    } 

} 

Answer 3

誰也不能保證這些事件將會以火。
在你的情況下，你不必多次實例化displaySprite。
只是不能將它清空，對象將在那裏。

var buttonSprite:Sprite = new Sprite(); 
addChild(buttonSprite); 
buttonSprite.addEventListener(MouseEvent.MOUSE_OVER, overSprite); 

//you only need to create it once. 
var displaySprite:Sprite = new Sprite(); 

function overSprite(e:MouseEvent):void{ 
    addChild(displaySprite); 
    buttonSprite.addEventListener(MouseEvent.MOUSE_OUT, outSprite); 
} 
function outSprite(e:MouseEvent):void{ 
    removeChild(displaySprite); 
}