Actionscript 3 在actionscript 3.0中，速度保持堆叠

我们一直在为我们的职业CPT制作这个游戏，你作为一个角色来玩，试图通过这些关卡，但问题是，每次你死后再回到这个关卡，速度会叠加在之前的速度之上，以至于游戏不再可以玩了。我们尝试过重置它并将其设置回0，但似乎没有任何效果。我们也尝试过对其进行编码，使其速度超过21，它将重置回20（我们的理想速度）。我们还尝试移除可能堆积在另一个之上的额外事件侦听器。如果你碰巧死了，但到达下一帧，该帧的速度会回到20。但如果你在该帧上死了，该帧的速度也会加倍。我们的代码是：

import flash.events.Event;
import flash.display.MovieClip;



//makes the character jump
var grav:Number = 10;
var jumping:Boolean = false;
var jumpPow:Number = 0;

stage.addEventListener(KeyboardEvent.KEY_DOWN, whenKeyPressed);
stage.addEventListener(Event.ENTER_FRAME, update);

function whenKeyPressed(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.UP)
{
    if(jumping != true)
    {
        jumpPow = -50;
        jumping = true;
    }
}   
}


function update(event:Event):void
{
if(jumping)
{
    player_mc.y += jumpPow;
    jumpPow += grav;

    if(player_mc.y >= stage.stageHeight)
    {
        jumping = false;
        player_mc.y = stage.stageHeight;
    }
    }
    //when the character makes it to the other side of the screen, the frame 
    changes
    if (player_mc.hitTestObject(frameChanger1))
    {
    gotoAndStop(91);
    }
    //end the game when the character touches the penguin
    if (player_mc.hitTestObject(penguin1))
   {
    gotoAndStop(89);
   }
   } 

   //makes the character move left and right
   var leftPressed:Boolean = false;
   var rightPressed:Boolean = false;

   player_mc.addEventListener(Event.ENTER_FRAME, moveInDirectionOfKey);
   stage.addEventListener(KeyboardEvent.KEY_DOWN, setKeyPressed);
   stage.addEventListener(KeyboardEvent.KEY_UP, unsetKeyPressed);

    function moveInDirectionOfKey(event:Event)
  {
   if (leftPressed)
  {
    player_mc.x -= 20;
  }
   if (rightPressed)
  {
    player_mc.x += 20;
  }
  }

   function setKeyPressed(event:KeyboardEvent):void
  {
   switch (event.keyCode)
  {
    case Keyboard.LEFT:
    {
        leftPressed = true;
        break;
    }
    case Keyboard.RIGHT:
    {
        rightPressed = true;
        break;
    }
    }
   }

     function unsetKeyPressed(event:KeyboardEvent):void
    {
        switch (event.keyCode)
    {
    case Keyboard.LEFT:
    {
        leftPressed = false;
        break;
    }
    case Keyboard.RIGHT:
    {
        rightPressed = false;
        break;
    }
    }
   //when the character makes it to the other side of the screen, the frame 
   changes
   if (player_mc.hitTestObject(frameChanger1))
  {
    gotoAndStop(91);
  }
    //end the game when the character touches the penguin
    if (player_mc.hitTestObject(penguin1))
  {
    gotoAndStop(89);
  }
  }

您是否尝试过：

if(!stage.hasEventListener(Event.ENTER_FRAME)){
    stage.addEventListener(Event.ENTER_FRAME, update);
}
if(!stage.hasEventListener(KeyboardEvent.KEY_DOWN)){
    stage.addEventListener(KeyboardEvent.KEY_DOWN, setKeyPressed);
}
if(!stage.hasEventListener(KeyboardEvent.KEY_UP)){
    stage.addEventListener(KeyboardEvent.KEY_UP, unsetKeyPressed);
}
if(!player_mc.hasEventListener(Event.ENTER_FRAME)){
    player_mc.addEventListener(Event.ENTER_FRAME, moveInDirectionOfKey);
}

等等

否则，您将多次注册事件。。。 这可能就是问题所在。 我不确定，我避免在多个帧上编码

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您也可以在此处使用@Philarmon的答案

@kaylee clarke:如果此代码解决了您的问题，请将答案标记为正确