Force Download from url

function forceDownload(href) {
  var li = Math.max(str.lastIndexOf('/'), str.lastIndexOf('\\'));
  var bn = new String(str).substring(li + 1);
	var anchor = document.createElement('a');
	anchor.href = href;
	anchor.download = bn;
	document.body.appendChild(anchor);
	anchor.click();
}