blob流导出文件以及对应格式

downloadFunc(filePath, filename) {
  const formData = new FormData()
  download({
    path: filePath
  }).then(response => {
    const blob = new Blob([response], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"})
    const fileName = filename
    if ('download' in document.createElement('a')) { // 非IE下载
      const elink = document.createElement('a')
      elink.download = fileName
      elink.style.display = 'none'
      elink.href = URL.createObjectURL(blob)
      document.body.appendChild(elink)
      elink.click()
      URL.revokeObjectURL(elink.href) // 释放URL 对象
      document.body.removeChild(elink)
    } else { // IE10+下载
      navigator.msSaveBlob(blob, fileName)
    }
  })
},