code: func ByteLength(str string, params ...string) bool {
  	if len(params) == 2 {
  		min, _ := ToInt(params[0])
  		max, _ := ToInt(params[1])
  		return len(str) >= int(min) && len(str) <= int(max)
  	}
  
  	return false
  }
docs: // ByteLength check string's length