function rgb2hex(sRGB) {
	// 匹配是否符合颜色格式
  let erx = /rgb\((\d{0,3},\s*){2}\d{0,3}\)/
  if(!erx.test(sRGB)) {
      return sRGB
  }
  // 找出xxx,xxx,xxx
  let reg = /(\d{0,3},\s*){2}\d{0,3}/
  let matchArr = sRGB.match(reg)[0].split(',')
  let returnVal = '#'
  for(let item of matchArr) {
      item = item.trim()
      if(item === '0') {
          returnVal += '00'
      } else {
          returnVal += Number(item).toString(16)   
      }
  }
  return returnVal
}