题解 | #颜色字符串转换#

抄的，但是改进了

function rgb2hex(sRGB) {
      // 找出每一组，然后替换16进制
      let newSRGB = sRGB.replace(/\s+/g, "")

      let regexp = /^rgb\(([01]\d{0,2}|2[0-5]{2}),([01]\d{0,2}|2[0-5]{2}),([01]\d{0,2}|2[0-5]{2})\)$/
      if (!regexp.test(newSRGB)) return sRGB

      return newSRGB.replace(regexp, (match, p1, p2, p3) => {
        p1 = toHex(p1)
        p2 = toHex(p2)
        p3 = toHex(p3)

        function toHex(p) {
          return (+p).toString(16).length === 1 ? '0' + (+p).toString(16) : (+p).toString(16)
        }

        return `#${p1}${p2}${p3}`
      })
    }