function download(src) {
 var $a = document.createElement('a');
 $a.setAttribute("href", src);
 $a.setAttribute("download", "");
 var evObj = document.createEvent('MouseEvents');
 evObj.initMouseEvent( 'click', true, true, window, 0, 0, 0, 0, 0, false, false, true, false, 0, null);
 $a.dispatchEvent(evObj);
 };