颜色相关

获取随机HEX颜色值

const randomHexColorCode = () => {
  let n = (Math.random() * 0xfffff * 1000000).toString(16)
  return '#' + n.slice(0, 6)
};
// 例子
randomHexColorCode() // '#e34155'

RGB转HEX

const RGBToHex = (r, g, b) =>
  ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');
// 例子
RGBToHex(255, 165, 1); // 'ffa501'

将 3 位颜色代码扩展到 6 位颜色代码

const extendHex = shortHex =>
  '#' +
  shortHex
    .slice(shortHex.startsWith('#') ? 1 : 0)
    .split('')
    .map(x => x + x)
    .join('');
// 例子
extendHex('#03f'); // '#0033ff'
extendHex('05a'); // '#0055aa'

HEX转RBG

const hexToRGB = hex => {
  let alpha = false,
    h = hex.slice(hex.startsWith('#') ? 1 : 0);
  if (h.length === 3) h = [...h].map(x => x + x).join('')
  else if (h.length === 8) alpha = true
  h = parseInt(h, 16)
  return (
    'rgb' +
    (alpha ? 'a' : '') +
    '(' +
    (h >>> (alpha ? 24 : 16)) +
    ', ' +
    ((h & (alpha ? 0x00ff0000 : 0x00ff00)) >>> (alpha ? 16 : 8)) +
    ', ' +
    ((h & (alpha ? 0x0000ff00 : 0x0000ff)) >>> (alpha ? 8 : 0)) +
    (alpha ? `, ${h & 0x000000ff}` : '') +
    ')'
  )
}
// 例子
hexToRGB('#27ae60ff') // 'rgba(39, 174, 96, 255)'
hexToRGB('27ae60') // 'rgb(39, 174, 96)'
hexToRGB('#fff') // 'rgb(255, 255, 255)'

RGB转Array

const toRGBArray = rgbStr => rgbStr.match(/\d+/g).map(Number)
// 例子
toRGBArray('rgb(255, 12, 0)') // [255, 12, 0]

RGB转Object

const toRGBObject = rgbStr => {
  const [red, green, blue] = rgbStr.match(/\d+/g).map(Number)
  return { red, green, blue }
}
// 例子
toRGBObject('rgb(255, 12, 0)'); // {red: 255, green: 12, blue: 0}

RGB转HSB

const RGBToHSB = (r, g, b) => {
  r /= 255;
  g /= 255;
  b /= 255;
  const v = Math.max(r, g, b),
    n = v - Math.min(r, g, b);
  const h =
    n === 0 ? 0 : n && v === r ? (g - b) / n : v === g ? 2 + (b - r) / n : 4 + (r - g) / n;
  return [60 * (h < 0 ? h + 6 : h), v && (n / v) * 100, v * 100];
};
// 例子
RGBToHSB(252, 111, 48);
// [18.529411764705856, 80.95238095238095, 98.82352941176471]

HSB转RGB

const HSBToRGB = (h, s, b) => {
  s /= 100;
  b /= 100;
  const k = (n) => (n + h / 60) % 6;
  const f = (n) => b * (1 - s * Math.max(0, Math.min(k(n), 4 - k(n), 1)));
  return [255 * f(5), 255 * f(3), 255 * f(1)];
};
// 例子
HSBToRGB(18, 81, 99); // [252.45, 109.31084999999996, 47.965499999999984]

RGB转HSL

const RGBToHSL = (r, g, b) => {
  r /= 255;
  g /= 255;
  b /= 255;
  const l = Math.max(r, g, b);
  const s = l - Math.min(r, g, b);
  const h = s
    ? l === r
      ? (g - b) / s
      : l === g
      ? 2 + (b - r) / s
      : 4 + (r - g) / s
    : 0;
  return [
    60 * h < 0 ? 60 * h + 360 : 60 * h,
    100 * (s ? (l <= 0.5 ? s / (2 * l - s) : s / (2 - (2 * l - s))) : 0),
    (100 * (2 * l - s)) / 2,
  ];
};
// 例子
RGBToHSL(45, 23, 11); // [21.17647, 60.71428, 10.98039]

HSL转RGB

const HSLToRGB = (h, s, l) => {
  s /= 100;
  l /= 100;
  const k = n => (n + h / 30) % 12;
  const a = s * Math.min(l, 1 - l);
  const f = n =>
    l - a * Math.max(-1, Math.min(k(n) - 3, Math.min(9 - k(n), 1)));
  return [255 * f(0), 255 * f(8), 255 * f(4)];
};
// 例子
HSLToRGB(13, 100, 11); // [56.1, 12.155, 0]

HSL改变亮度值

const changeLightness = (delta, hslStr) => {
  const [hue, saturation, lightness] = hslStr.match(/\d+/g).map(Number);
  const newLightness = Math.max(
    0,
    Math.min(100, lightness + parseFloat(delta))
  );
  return `hsl(${hue}, ${saturation}%, ${newLightness}%)`;
};
// 例子
changeLightness(10, 'hsl(330, 50%, 50%)'); // 'hsl(330, 50%, 60%)'
changeLightness(-10, 'hsl(330, 50%, 50%)'); // 'hsl(330, 50%, 40%)'

HSL转Array

const toHSLArray = hslStr => hslStr.match(/\d+/g).map(Number);
// 例子
toHSLArray('hsl(50, 10%, 10%)'); // [50, 10, 10]

HSL转Object

const toHSLObject = hslStr => {
  const [hue, saturation, lightness] = hslStr.match(/\d+/g).map(Number);
  return { hue, saturation, lightness };
};
// 例子
toHSLObject('hsl(50, 10%, 10%)'); // { hue: 50, saturation: 10, lightness: 10 }