从 https://flatuicolors.com/ 提取颜色代码

colors.js

var rgbToHex = function(rgb) {
  var hex = Number(rgb).toString(16);
  if (hex.length < 2) {
    hex = "0" + hex;
  }
  return hex;
};

var fullColorHex = function(r, g, b) {
  var red = rgbToHex(r);
  var green = rgbToHex(g);
  var blue = rgbToHex(b);
  return red + green + blue;
};

var styleToHex = function($ele) {
  const name = $ele
    .querySelector("span")
    .innerText.toLowerCase()
    .split(" ")
    .join("-");
  const arr = $ele.style.background.match(/\((.*)\)/)[1].split(", ");
  return `$color-${name}: #${fullColorHex(...arr)};`;
};

let printS = "";
function log(str) {
  printS += str + "\n";
}
log.end = function() {
  console.log(printS);
  printS = "";
};

$$(".colors > div").forEach(item => {
  log(styleToHex(item));
});

log.end();