function download (url, fileName) {
 const x = new XMLHttpRequest()
 x.responseType = 'blob'
 x.open('GET', url, true)
 x.send()
 x.onload = () => {
   const downloadElement = document.createElement('a')
   const href = window.URL.createObjectURL(x.response) // create download url
   downloadElement.href = href
   downloadElement.download = fileName // set filename (include suffix)
   document.body.appendChild(downloadElement) // append <a>
   downloadElement.click() // click download
   document.body.removeChild(downloadElement) // remove <a>
   window.URL.revokeObjectURL(href) // revoke blob
 }
}
export { download }