docs: def time_elapsed(func):
      """
      记录函数运行耗时的生成器
      :param func:
      :return:
      """
  
      @wraps(func)
      def wrapper(*args, **kwargs):
          timestamp = time.time() * 1000
          ret = func(*args, **kwargs)
          now_ts = time.time() * 1000
          elapsed = now_ts - timestamp
          print('%s costs time: %.2fms' % (func.__name__, elapsed))
          return ret
  
      return wrapper