アクションスクリプト3.0エラー

Question

エラー＃1009：nullオブジェクト参照のプロパティまたはメソッドにアクセスできません。 MethodInfo-10（）の このコードを実行中にこのエラーが発生します。誰でも私が間違っていることを教えてもらえますか？エラーがどこにあるのか、エラーの行が表示されていません。ありがとう

package 
{ 
    import flash.events.MouseEvent; 
    import flash.display.MovieClip; 
    import flash.events.KeyboardEvent; 
    import flash.ui.Keyboard; 
    public class Main extends MovieClip 
    { 
     public function Main() 
     { 
      stop(); 
      start_btn.addEventListener(MouseEvent.CLICK, gothere); 
      function gothere(clickInfo:MouseEvent) 
      { 
       start_btn.removeEventListener(MouseEvent.CLICK, gothere); 
       nextFrame(); 
      } 

      stage.addEventListener(KeyboardEvent.KEY_DOWN, key_pressed); 
      function key_pressed(event:KeyboardEvent):void 
      { 
       switch (event.keyCode) 
       { 
        case Keyboard.UP : 
         { 
          player.y += -5; 
          if ((wall1.hitTestPoint(player.x - player.width/2, player.y - player.height/2,true)) || (wall2.hitTestPoint(player.x - player.width/2, player.y - player.height/2,true))) 
          { 
           player.y += 5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback); 
           function goback(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback); 
            prevFrame(); 
           } 


          } 
          else if ((wall1.hitTestPoint(player.x + player.width/2, player.y - player.height/2,true)) || (wall2.hitTestPoint(player.x + player.width/2, player.y - player.height/2,true))) 
          { 
           player.y += 5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback1); 
           function goback1(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback1); 
            prevFrame(); 
           } 
          } 
          else if (player.hitTestObject(finish)) 
          { 
           gotoAndStop(4); 
          } 
          break; 





         }; 
        case Keyboard.DOWN : 
         { 
          player.y += 5; 
          if ((wall1.hitTestPoint(player.x - player.width/2, player.y + player.height/2,true)) || (wall2.hitTestPoint(player.x - player.width/2, player.y + player.height/2,true))) 
          { 
           player.y += -5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback2); 
           function goback2(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback2); 
            prevFrame(); 
           } 
          } 
          else if ((wall1.hitTestPoint(player.x + player.width/2, player.y + player.height/2,true)) || (wall2.hitTestPoint(player.x + player.width/2, player.y + player.height/2,true))) 
          { 
           player.y += -5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback3); 
           function goback3(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback3); 
            prevFrame(); 
           } 
          } 
          else if (player.hitTestObject(finish)) 
          { 
           gotoAndStop(4); 
          } 
          break; 





         }; 
        case Keyboard.LEFT : 
         { 
          player.x += -5; 
          if ((wall1.hitTestPoint(player.x - player.width/2, player.y - player.height/2,true)) || (wall2.hitTestPoint(player.x - player.width/2, player.y - player.height/2,true))) 
          { 
           player.x += 5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback4); 
           function goback4(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback4); 
            prevFrame(); 
           } 
          } 
          else if ((wall1.hitTestPoint(player.x - player.width/2, player.y + player.height/2,true)) || (wall2.hitTestPoint(player.x - player.width/2, player.y + player.height/2,true))) 
          { 
           player.x += 5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback5); 
           function goback5(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback5); 
            prevFrame(); 
           } 
          } 
          else if (player.hitTestObject(finish)) 
          { 
           gotoAndStop(4); 
          } 
          break; 





         }; 
        case Keyboard.RIGHT : 
         { 
          player.x += 5; 
          if ((wall1.hitTestPoint(player.x + player.width/2, player.y - player.height/2,true)) || (wall2.hitTestPoint(player.x + player.width/2, player.y - player.height/2,true))) 
          { 
           player.x += -5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback6); 
           function goback6(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback6); 
            prevFrame(); 
           } 
          } 
          else if ((wall1.hitTestPoint(player.x + player.width/2, player.y + player.height/2,true)) || (wall2.hitTestPoint(player.x + player.width/2, player.y + player.height/2,true))) 
          { 
           player.x += -5; 
           nextFrame(); 
           playagain_btn.addEventListener(MouseEvent.CLICK, goback7); 
           function goback7(event:MouseEvent):void 
           { 
            playagain_btn.removeEventListener(MouseEvent.CLICK, goback7); 
            prevFrame(); 
           } 
          } 
          else if (player.hitTestObject(finish)) 
          { 
           gotoAndStop(4); 
          } 
          break; 



        } 

       } 


      } 
     } 

    } 
}; 

Answer 1

重複して重複してコードを作成することから始めます。また、関数内で定義された関数は関数内で定義されていますか？非常に多くのレベルで間違っています。

package 
{ 
    import flash.ui.Keyboard; 

    import flash.display.MovieClip; 

    import flash.events.MouseEvent; 
    import flash.events.KeyboardEvent; 

    public class Main extends MovieClip 
    { 
     public function Main() 
     { 
      stop(); 
      start_btn.addEventListener(MouseEvent.CLICK, goThere); 
      stage.addEventListener(KeyboardEvent.KEY_DOWN, onKey); 
     } 

     private function goBack(e:MouseEvent):void 
     { 
      playagain_btn.removeEventListener(MouseEvent.CLICK, goBack); 
      prevFrame(); 
     } 

     private function goThere(clickInfo:MouseEvent):void 
     { 
      start_btn.removeEventListener(MouseEvent.CLICK, gothere); 
      nextFrame(); 

      stage.focus = stage; 
     } 

     private function testPlayer():Boolean 
     { 
      if (wall1.hitTestPoint(player.x - player.width/2, player.y - player.height/2,true) return true; 
      if (wall2.hitTestPoint(player.x - player.width/2, player.y - player.height/2,true) return true; 
      if (wall1.hitTestPoint(player.x + player.width/2, player.y - player.height/2,true) return true; 
      if (wall2.hitTestPoint(player.x + player.width/2, player.y - player.height/2,true) return true; 

      return false; 
     } 

     private function movePlayer(dx:Number, dy:Number):void 
     { 
      player.x += dx; 
      player.y += dy; 

      if (player.hitTestObject(finish)) 
      { 
       gotoAndStop(4); 
      } 
      else if (testPlayer()) 
      { 
       player.x -= dx; 
       player.y -= dy; 

       nextFrame(); 

       playagain_btn.addEventListener(MouseEvent.CLICK, goBack); 
      } 
     } 

     private function onKey(event:KeyboardEvent):void 
     { 
      switch (event.keyCode) 
      { 
       case Keyboard.UP: 
        movePlayer(0,-5); 
        break; 

       case Keyboard.DOWN: 
        movePlayer(0,5); 
        break; 

       case Keyboard.LEFT: 
        movePlayer(-5,0); 
        break; 

       case Keyboard.RIGHT: 
        movePlayer(5,0); 
        break; 
      } 
     } 
    } 
}