toString.call(res) === '[object Blob]'

    if (response.status === 200 && (res.code === 200 || toString.call(res) === '[object Blob]')) {
      if (response.headers['content-disposition'] && response.headers['content-disposition'].indexOf('filename') !== -1) { // 如果是文件流
        return response
      } else {
        return res
      }
    } else { // 全局异常的500 走这里
      Message({
        message: res.msg || 'Error',
        type: 'error',
        duration: 3 * 1000
      })
      return Promise.reject(new Error(res.msg || 'Error'))
    }