JTrackBar水平拖动效果

        if(position > maxPosition)
            position = maxPosition;
        if(position < minPosition)
            position = minPosition;        

        var pos_ = JPos.getAbsPos(oTrackArea);
        var w_ = parseInt(getRunStyle(oBtnPointer,"width"));

        oBtnPointer.style.left = pos_.x - w_/2 + preFrequenceWidth * position  + "px"; 

        doChange();
    }

    var doChange = function(){
        self.onChange(position);
    }

    this.getPosition = function(){
        return position;
    }

    this.setSkin = function(pSkin){
        oOutline.className = pSkin;
        recalcTrackArea();
    }
}
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