前端post导出excel及错误信息处理

// that是传入的vue实例
  async exportDocumentByPost(urlParams, exportParams, downloadName, that){
    const response = await axios({
      url: `导出url/${urlParams}`,
      method: 'post',
      responseType: 'blob', // 这句话很重要
      data: exportParams
    })
    console.log(response)
    if (response.status !== 200) {
      console.log('网络或服务器异常！')
      return
    }
    const res = await new Promise((resolve, reject) => {
      if (response.headers['content-type'].includes('json')) {
        // 此处拿到的data才是blob
        const { data } = response
        const reader = new FileReader()
        reader.onload = () => {
          const { result } = reader
          const errorInfos = JSON.parse(result)
          const { message } = errorInfos
          that.$message.error(message || '无法导出,请联系管理员')
          reject(message)
        }
        reader.onerror = err => {
          reject(err)
        }
        reader.readAsText(data)
      } else {
        resolve(response)
      }
    })
    let blob = new Blob([response.data], { type: response.headers['content-type'] })
    const a = window.document.createElement('a')
    const downUrl = window.URL.createObjectURL(blob)// 获取 blob 本地文件连接 (blob 为纯二进制对象，不能够直接保存到磁盘上)
    a.href = downUrl
    a.download = `${downloadName}.xls`
    a.click()
    window.URL.revokeObjectURL(downUrl)
  }

参考链接：https://zhuanlan.zhihu.com/p/408866162