def _code_to_symbol(code)
      return INDEX_LIST[code] if INDEX_LABELS.include?(code)
      return ''               if code.nil? or code.size != 6
      ['5','6','9'].include?(code[0]) ? "sh#{code}" : "sz#{code}"
    end
def _code_to_symbol(code)
      return INDEX_LIST[code] if INDEX_LABELS.include?(code)
      return ''               if code.nil? or code.size != 6
      ['5','6','9'].include?(code[0]) ? "sh#{code}" : "sz#{code}"
    end
生成symbol代码标志