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window.downloadFile = function (sUrl) {

  //iOS devices do not support downloading. We have to inform user about this.
  if (/(iP)/g.test(navigator.userAgent)) {
    alert('Your device does not support files downloading. Please try again in desktop browser.')
    return false
  }

  //If in Chrome or Safari - download via virtual link click
  if (window.downloadFile.isChrome || window.downloadFile.isSafari) {
    //Creating new link node.
    var link = document.createElement('a')
    link.href = sUrl

    if (link.download !== undefined) {
      //Set HTML5 download attribute. This will prevent file from opening if supported.
      var fileName = sUrl.substring(sUrl.lastIndexOf('/') + 1, sUrl.length)
      link.download = fileName
    }

    //Dispatching click event.
    if (document.createEvent) {
      var e = document.createEvent('MouseEvents')
      e.initEvent('click', true, true)
      link.dispatchEvent(e)
      return true
    }
  }

  // Force file download (whether supported by server).
  if (sUrl.indexOf('?') === -1) {
    sUrl += '?download'
  }

  window.open(sUrl, '_self')
  return true
}

window.downloadFile.isChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1
window.downloadFile.isSafari = navigator.userAgent.toLowerCase().indexOf('safari') > -1

方法 window.download(url)

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