颜色的逆置

将十六进制表示的颜色值，转换成十进制，再用255减去十进制值，最后转成十六进制的值表示：

例如：最初是#FF0000  与它对立的颜色是#00FFFF    

 function changeRGB(RGBs) {
        var arr = RGBs.split('');
      //  console.log(RGBs);
        var rgb1 = arr[1].concat(arr[2]);
       // console.log(rgb1);
        var rgb2 = arr[3].concat(arr[4]);
        //console.log(rgb2);
        var rgb3 = arr[5].concat(arr[6]);
       // console.log(rgb3);
        var arr1 = [];
        arr1[0] = parseInt(rgb1, 16);
       // console.log(arr1[0]);
        arr1[1] = parseInt(rgb2, 16);
       // console.log(arr1[1]);
        arr1[2] = parseInt(rgb3, 16);
       // console.log(arr1[2]);
        // var rgb10=arr1.join(",");
        var rgb16 = [];
        for (var i = 0; i < arr1.length; i++) {
            rgb16[i] = (255 - arr1[i]).toString(16, 2).toUpperCase();
            if (rgb16[i].length < 2) {
                rgb16[i] = "0".concat(rgb16[i]);
            }
        }
        //console.log(rgb16[0]);
       // console.log(rgb16[1]);
        //console.log(rgb16[2]);
        var result = rgb16.join('');
        alert("#" + result);
    }