Question

我只是在学习ActionScript 3，所以这对你来说是一个很好的问题。我通过使用按钮创建了我想要添加到舞台（从库中）的影片剪辑。我总共有六个按钮（和六个moviclips），但我试图让前两个按钮工作，然后再转到下一个按钮。问题是，当单击另一个按钮时，我似乎无法删除影片剪辑，或者相同的按钮......就像我说我是新手，我认为创建了一堆东西......我收到错误2007年现在

import flash.events.MouseEvent;
import flash.display.MovieClip;

mix_btn.addEventListener(MouseEvent.CLICK, addbear);
function addbear(event:MouseEvent):void
{
    var movieClip:bear1 = new bear1();
    addChild(movieClip);
    movieClip.x = 240;
    movieClip.y = 45;


mix_btn.removeEventListener(MouseEvent.CLICK, addbear);
mix_btn.addEventListener(MouseEvent.CLICK, removebear);
}
function removebear(event:MouseEvent):void
{
    var movieClip:bear1 = null;
    removeChild(movieClip);
    mix_btn.removeEventListener(MouseEvent.CLICK, removebear);
/*  mix_btn.addEventListener(MouseEvent.CLICK, addbear);*/
}
shake_btn.addEventListener(MouseEvent.CLICK, addbear3);
function addbear3(event:MouseEvent):void
{
    var movieClip:bear3 = new bear3();
    addChild(movieClip);
    movieClip.x = 240;
    movieClip.y = 45;

    shake_btn.removeEventListener(MouseEvent.CLICK, addbear3);
    shake_btn.addEventListener(MouseEvent.CLICK, removebear3);
}
function removebear3(event:MouseEvent):void
{
    var movieClip:bear3 = null;
    removeChild(movieClip);
    shake_btn.removeEventListener(MouseEvent.CLICK, removebear3);
    shake_btn.addEventListener(MouseEvent.CLICK, addbear3);
}

Answer 1

var movieClip:bear1 = null;
removeChild(movieClip);
mix_btn.removeEventListener(MouseEvent.CLICK, removebear);

这部分，你基本上尝试删除一个空对象，它通常是坏的:)。这适用于“蛇”和其他按钮或动画片段。如果你想删除你点击的熊，试试这个：

var movieClip:bear1 = bear1(event.currentTarget);
removeChild(movieClip);
mix_btn.removeEventListener(MouseEvent.CLICK, removebear);

Answer 2

问题在于您将movieClip作为函数级变量引用，该函数在该函数完成时消失。当您的删除功能稍后发生时，movieclip本身仍然存在，但您用来引用它的movieclip变量已经消失。

如果remove事件直接在bear上，您可以使用event.currentTarget来访问和删除它。

相反，由于看起来您的侦听器位于单独的按钮上，因此您需要对可在任何位置工作的动画片段的引用。如果为影片剪辑指定实例名称，则可以使用该名称稍后访问和删除它。

function addbear(event:MouseEvent):void 
{ 
    var movieClip:bear1 = new bear1();
    addChild(movieClip); 
    movieClip.x = 240; 
    movieClip.y = 45;
    movieClip.name = "bear1";  
} 

function removebear(event:MouseEvent):void 
{ 
    removeChild(getChildByName("bear1"));
}

Answer 3

这完全是一个范围问题在你的函数addbear中，你创建一个范围为此函数的var，名为movieClip

mix_btn.addEventListener(MouseEvent.CLICK, addbear);
function addbear(event:MouseEvent):void
{
    var movieClip:bear1 = new bear1();
    addChild(movieClip);
    movieClip.x = 240;
    movieClip.y = 45;


mix_btn.removeEventListener(MouseEvent.CLICK, addbear);
mix_btn.addEventListener(MouseEvent.CLICK, removebear);
}
function removebear(event:MouseEvent):void
{
    var movieClip:bear1 = null;
    removeChild(movieClip);
    mix_btn.removeEventListener(MouseEvent.CLICK, removebear);
/*  mix_btn.addEventListener(MouseEvent.CLICK, addbear);*/
}

要纠正这个问题，你需要将mopvieClip的范围移到函数之外

   mix_btn.addEventListener(MouseEvent.CLICK, addbear);
    var movieClip:bear1 // **********************global scoping
    function addbear(event:MouseEvent):void
    {
        movieClip = new bear1(); // *************constructing new GLOBAL object here
        addChild(movieClip);
        movieClip.x = 240;
        movieClip.y = 45;


    mix_btn.removeEventListener(MouseEvent.CLICK, addbear);
    mix_btn.addEventListener(MouseEvent.CLICK, removebear);
    }
    function removebear(event:MouseEvent):void
    {
        removeChild(movieClip);//****************** remove movieClip first
        movieClip= null; // **********************destroying GLOBAL object here
        mix_btn.removeEventListener(MouseEvent.CLICK, removebear);
    /*  mix_btn.addEventListener(MouseEvent.CLICK, addbear);*/
    }

ActionScript 3 - 在舞台上添加和删除子项

3 个答案: