我已经粘贴了我的编码。最初,我在编写代码时不小心进入了第 2 帧,但后来我删除了代码文件并重新创建了文件。但是,问题仍然存在。谁能帮我这个代码
public class firstGame extends MovieClip
{
public var mcPlayer:MovieClip;
private var leftKeyIsDown:Boolean;
private var rightKeyIsDown:Boolean;
public function firstGame()
{
//trace("First Game Loaded");
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
stage.addEventListener(KeyboardEvent.KEY_UP, keyUp);
stage.addEventListener(Event.ENTER_FRAME, gameLoop);
}
private function gameLoop(e:Event):void
{
trace("Loaded");
}
private function playerControl():void
{
if (leftKeyIsDown == true)
{
mcPlayer.x -= 5;
}
if (rightKeyIsDown == true)
{
mcPlayer.x += 5;
}
}
private function keyUp(e:KeyboardEvent):void
{
if (e.keyCode == 37)
{
//left key released
leftKeyIsDown = false;
}
if (e.keyCode == 39)
{
//right key released
rightKeyIsDown = false;
}
}
private function keyDown(e:KeyboardEvent):void
{
if (e.keyCode == 37)
{
//left key released
leftKeyIsDown = true;
}
if (e.keyCode == 39)
{
//right key released
rightKeyIsDown = true;
}
}
}
错误是
TypeError:错误 #1009:无法访问空对象引用的属性或方法。在 firstGame/gameLoop() 的 firstGame/playerControl() 处输入代码
请帮我解决