rgb颜色转16进制格式的代码

function zero_fill_hex(num, digits) {  var s = num.toString(16);  while (s.length < digits)    s = "0" + s;  return s;}function rgb2hex(rgb) {  if (rgb.charAt(0) == '#')    return rgb;   var ds = rgb.split(/\D+/);  var decimal = Number(ds[1]) * 65536 + Number(ds[2]) * 256 + Number(ds[3]);  return "#" + zero_fill_hex(decimal, 6);}

function rgbToHex(r, g, b) { return ((r << 16) | (g << 8) | b).toString(16); }