JavaScript实现的浏览器下载文件的方法

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);  };