code: function defaultErrorHandler(jqXHR, textStatus, errorThrown) {
      var result = {
          status: REQUEST_FAIL_STATUS,
          statusInfo: {
              message: '服务器正忙...请稍后再试',
              detail: {
                  httpStatus: jqXHR.status,
                  textStatus: textStatus,
                  errorThrown: errorThrown,
                  xhr: jqXHR
              }
          }
      };
  
      commonErrorStatusHandler.call(this, result);
      return $.Deferred().reject(result).promise();
  }
docs: 接口调用失败时的默认处理方法
  
  @param {object} jqXHR
  @param {string} textStatus
  @param {string} errorThrown