docs: def query_str_2_dict(query_str):
      """
      将查询字符串，转换成字典
      a=123&b=456
      {'a': '123', 'b': '456'}
      :param query_str:
      :return:
      """
      if query_str:
          query_list = query_str.split('&')
          query_dict = {}
          for t in query_list:
              x = t.split('=')
              query_dict[x[0]] = x[1]
      else:
          query_dict = {}
      return query_dict