// 把文件流下载下来
const downloadMethods = (name, res) => {
  const blob = new Blob([res.data], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' })
  const link = document.createElement('a')
  link.href = URL.createObjectURL(blob)
  link.download = name // 文件名
  document.body.appendChild(link)
  link.click()
  window.setTimeout(function() {
    URL.revokeObjectURL(blob)
    document.body.removeChild(link)
  }, 0)
}