同时删除事件侦听器和精灵 AS3
我无法同时删除事件侦听器和精灵。我目前收到错误：
TypeError：错误#1009：无法访问 空对象的属性或方法 参考。
如果我注释掉removeChild，我就没有错误，但显然，精灵仍保留在屏幕上。我有什么想法可以摆脱这个错误吗？
//Bullet extends Sprite Class
bullet:Bullet = new Bullet();
mc.addChild(bullet);
bullet.addEventListener(Event.ENTER_FRAME, shoot);
function shoot(e:Event):void {
var shot:Bullet = e.currentTarget as Bullet;
//check shot is outside the frame
if (shot.x < 0 - shot.width || shot.x > stage.stageWidth || shot.y > 525)
{
//trying to remove the thing and it's listener
e.currentTarget.removeEventListener(e.type,arguments.callee);
e.currentTarget.parent.removeChild(shot);
}
else
{
shot.setInMotion();
}
}
I’m having trouble removing the an event listener as well as the sprite at the same time. I currently get an error:
TypeError: Error #1009: Cannot access
a property or method of a null object
reference.
And if I comment out removeChild, I have no error but, obviously, the sprite remains on the screen. Any ideas how I can rid myself of that error?
//Bullet extends Sprite Class
bullet:Bullet = new Bullet();
mc.addChild(bullet);
bullet.addEventListener(Event.ENTER_FRAME, shoot);
function shoot(e:Event):void {
var shot:Bullet = e.currentTarget as Bullet;
//check shot is outside the frame
if (shot.x < 0 - shot.width || shot.x > stage.stageWidth || shot.y > 525)
{
//trying to remove the thing and it's listener
e.currentTarget.removeEventListener(e.type,arguments.callee);
e.currentTarget.parent.removeChild(shot);
}
else
{
shot.setInMotion();
}
}
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除了在bullet:Bullet之前缺少var之外，我在示例代码中没有看到任何错误。您应该在以下位置之后设置一个断点：
并找出为什么 shot 为空。我怀疑除了您作为示例提供的一小段代码之外，还有一段代码存在问题。如果代码仅使用注释掉的removeChild行，它告诉我e.currentTarget不为null，但它也不是对Bullet类型实例的引用（即“as”强制转换返回null）。
Apart from a missing var before bullet:Bullet, I don't see anything wrong in the example code. You should set a breakpoint right after:
And figure out why shot is null. I suspect there is something amiss in a piece of code outside of the little bit you're providing as the example. If the code is working with only the removeChild line commented out, it tells me that e.currentTarget is not null, but that it's also not a reference to an instance of type Bullet (i.e. the "as" cast is returning null).
尝试反转这些行
也许对 e.currentTarget 的引用正在通过对象引用
丢失
Try reversing these lines
Maybe the reference to e.currentTarget is getting lost through the object references
to