值在函数外部变化但在函数内恢复原始值

Question

问题 代码第一次运行时，它可以正常回答正确的答案。然而，除非您选择与第一个答案相同的值，否则一切都会出错。该值在比较输入值和答案的函数之前发生变化，但不会恢复到它的值。

代码：

var eventCount : Number = 1;
function intervalTraining()
{
    //sounds
    //first note
    var randomSound1High : int = 12;
    var randomSound1Low : int = 77;
    var randomSound1 : int = Math.floor(Math.random()*(1+randomSound1High-randomSound1Low))+randomSound1Low;
    //second note
    var randomSound2High : int = randomSound1-12;
    var randomSound2Low : int = randomSound1+12;
    var randomSound2 : int = Math.floor(Math.random()*(1+randomSound2High-randomSound2Low))+randomSound2Low;
    trace(randomSound1, randomSound2);
    //interval
    var interval : int =Math.abs(randomSound1-randomSound2);
    //play sounds
    function playIntervals()
    {
    //  set timer;                          add timer listener;                                         start timer
    var myTimer:Timer = new Timer(500, 1);  myTimer.addEventListener(TimerEvent.TIMER, playInterval2);  myTimer.start();
        //play first interval
        intervalArray[randomSound1].play(100, 1);
        //play second interval
        function playInterval2(event:TimerEvent):void 
        {
            intervalArray[randomSound2].play(100, 1);
        }
    }

    if (eventCount==1)
    {
    //button actions
        P1.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(0);});
        M2.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(2);});
        M3.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(4);});
        P4.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(5);});
        P5.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(7);});
        M6.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(9);});
        M7.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(11);});
        P8.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(12);});
        m2.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(1);});
        m3.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(3);});
        TT.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(6);});
        m6.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(8);});
        m7.addEventListener(MouseEvent.CLICK, function(e:Event){buttonClick(10);});
    }eventCount=eventCount+1;
trace("b4 function interval: "+interval)//new value is shown
function buttonClick(intervalValue:Number):void
{
    trace("infuntion interval: "+interval)//resorts back to old value for some reason
    if(intervalValue==interval){trace("correct");intervalTraining();}else{trace("wrong");};
}
    playIntervals();
}
intervalTraining();