前端下载后端返回的数据流文件

exportFile().then((res: any) => {
  const blob = new Blob([res.data], { type: 'application/octet-stream' })
  const link = document.createElement('a')
  link.href = URL.createObjectURL(blob)
  link.download = `aaa.xlsx`
  document.body.appendChild(link)
  link.click()
  document.body.removeChild(link)
  setTimeout(function () {
  URL.revokeObjectURL(blob)
  }, 100)
})

// 导出文件
export function exportFile() {
  return http({
    url: `/xxx`,
    method: 'post',
    responseType: 'blob'
  })
}