Flash 操作脚本3.0中变量的IF语句

我正在为一个项目构建一个样本垫式仪器，我有四个通道用于四种不同的仪器界面有四个按钮用于选择仪器，当选择按钮时，图像应为绿色，但当选择其他乐器时，图像应转到电影剪辑的第二帧，这是一个红色按钮，表示乐器已关闭

第23行我为与频道相关的变量添加了一个条件语句，它不会显示任何错误，但在我单击另一个按钮时也不会更改图像。有人知道我哪里出错了吗

//import flash stuff

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

stop();

//event listener for the power button

poweroff.addEventListener(MouseEvent.CLICK, mouseClick1);

function mouseClick1(event:MouseEvent):void{
gotoAndStop(1);
}

//select which samples to use with event listener,
//changes var selector bellow, so input listens for
//different samples

drumSelector.addEventListener(MouseEvent.CLICK, drumClick);
function drumClick(event:MouseEvent):void{
selector = drums;
if (selector == drums) 
{
drumSelector.gotoAndStop(1);
}else{
drumSelector.gotoAndStop(2);
}

}

bassSelector.addEventListener(MouseEvent.CLICK, bassClick);
function bassClick(event:MouseEvent):void{
selector = bass;
}

synthSelector.addEventListener(MouseEvent.CLICK, synthClick);
function synthClick(event:MouseEvent):void{
selector = synth;
}

beatSelector.addEventListener(MouseEvent.CLICK, beatClick);
function beatClick(event:MouseEvent):void{
selector = beat;
}

//selects which movieclip samples to use for input

var selector:MovieClip = drums;


//listen for events on display keyboard
//make movieclips visible so they can play samples

key1.addEventListener(MouseEvent.CLICK, key1Click);
function key1Click(evt:MouseEvent):void
{
selector.i1.visible=true;
}

key2.addEventListener(MouseEvent.CLICK, key2Click);
function key2Click(evt:MouseEvent):void
{
selector.i2.visible=true;
}

key3.addEventListener(MouseEvent.CLICK, key3Click);
function key3Click(evt:MouseEvent):void
{
selector.i3.visible=true;
}

key4.addEventListener(MouseEvent.CLICK, key4Click);
function key4Click(evt:MouseEvent):void
{
selector.i4.visible=true;
}

---

目前，您的条件仅在单击drumSelector按钮时执行，因为它位于drumSelector click处理程序中。您应该将条件移动到一个单独的函数中，并从控制仪器的四个按钮的单击处理程序中调用它。

为条件创建一个新函数，如：

function updateSelector(){

  if (selector == drums) 
  {
      drumSelector.gotoAndStop(1);
  }else{
      drumSelector.gotoAndStop(2);
  }
}

然后在每个按钮处理程序中：

bassSelector.addEventListener(MouseEvent.CLICK, bassClick);

function bassClick(event:MouseEvent):void{
    selector = bass;
    updateSelector();
}