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rgb于16进制相互转换

    public static rgbToHex(r,g,b)
    {
          return "0x"+((r << 16) | (g << 8) | b).toString(16); 
    }

    public static hexToRgb(value)
    {
         var v = parseInt(value);
         var r  = v>>16  & 0xFF ;
         var g = v>>8  & 0xFF ;
         var b = v  & 0xFF;
         console.log("v=="+v +" r="+r+" g:"+g+" b:"+b) ;
    }