自由变换MC的颜色，flash colorMC类

[0] = (newCol [0] - nowCol [0]) / step_int;
            delCol [1] = (newCol [1] - nowCol [1]) / step_int;
            delCol [2] = (newCol [2] - nowCol [2]) / step_int;
            //
            _step_int = step_int;
            _intervalID = setInterval (Delegate.create (this, changeColor) , 40, newCol, delCol);
        }
    }
    /**
    *=============================================
    * 函数：changeColor(newCol : Array, delCol : Array)
    * 参数：1.newCol ：新的颜色值；
    *        2.delCol ：每次增加的颜色值；
    * 说明：无
    * =============================================
    * */
    private function changeColor (newCol : Array, delCol : Array)
    {
        _step_int --;
        for (var i = 0 ; i < 3 ; i ++)
        {
            nowCol [i] += delCol [i]
        }
        var _R = nowCol [0].toString (16);
        if (_R.length == 1)
        {
            _R = "0" + _R;
        }
        var _G = nowCol [1].toString (16);
        if (_G.length == 1)
        {
            _G = "0" + _G;
        }
        var _B = nowCol [2].toString (16);
        if (_B.length == 1)
        {
            _B = "0" + _B;
        }
        var color_num = parseInt ("0x" + _R + _G + _B, 16);
        //合并数据，转为颜色值
        _col.setRGB (color_num);