Does this a action speed bug?

@wuxiaomo wrote:

I have an animation then want to dynamic control its speed with action speed.
But it is very strange that whatever i add or plus its speed, the animation always speed up.

here is the code:

    var animationFrames = [];
    for(var i=1;i!=8;i++){
        var path = typeName + i +'.png';
        var frame = cc.spriteFrameCache.getSpriteFrame(path);
        animationFrames.push(frame);
    }
    var animation = new cc.Animation(animationFrames,intervalTime);
    var runningAction = new cc.animate(animation).repeatForever();
    runningAction.retain();

here is the speedup function:

    adjustRunningSpeed:function(x){
         var speedx =  this.runningAction.getSpeed();
         var finalSpeed = speedx + x;
         this.runningAction.setSpeed(finalSpeed);


},

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