Js converts the color value rgb to hexadecimal

When javascript uses dom to obtain the color values of backgroundColor and other styles, it obtains an rgb format value, such as rgb (, 12 ).
The following is a conversion function I wrote:


[Javascript]
Function RGBToHex (rgb ){
Var regexp =/^ rgb/([0-9] {})/,/s ([0-9 })/, /s ([0-9] {0, 3})/g;
Var re = rgb. replace (regexp, "$1 $2 $3"). split (""); // remove unnecessary parts using regular expressions
Var hexColor = "#"; var hex = ['0', '1', '2', '3', '4', '5', '6 ', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
For (var I = 0; I <3; I ++ ){
Var r = null; var c = re [I];
Var hexAr = [];
While (c> 16 ){
R = c % 16;
C = (c/16)> 0;
HexAr. push (hex [r]);
} HexAr. push (hex [c]);
HexColor + = hexAr. reverse (). join ('');
}
// Alert (hexColor)
Return hexColor;
}

From lazy Tom