黑白打印下能区分的颜色色值

翻译于这篇文章

function randowRgb(x) {
  let R = 0
  let G = 0
  let B = 0
  while (R <= 30 || G <= 30 || B <= 30 || B >= 255) {
    R = Math.floor(Math.random() * 255)
    G = Math.floor(Math.random() * 255)
    B = Math.floor((x * 100 - R * 30 - G * 59) / 11)
    if (R > 30 && G > 30 && B > 30 && B < 255) {
      return `rgb(${R}, ${G}, ${B})`
    }
  }
}