hello my source code is this

function xcuDownloadFunction(ele, url) {
    var permissionValue = {{ $xf.visitor->hasPermission('xcuLimitRosourceDownloads', 'countdownTimerTime') }};
    var countdownValue = (permissionValue === 0) ? {$xf.options.xcu_lrdl_countdown_timer_time} : permissionValue;
    var counter = (countdownValue === 0) ? {$xf.options.xcu_lrdl_countdown_timer_time} : countdownValue;
    var a = document.createElement('a');
    var link = document.createTextNode("{{ phrase('download') }}");
    var icon = document.createElement('i');
    icon.className = "fas fa-download";
    a.appendChild(icon);
    a.appendChild(link);
    a.href = url;
    a.className = "button button--cta download-btn";

What should I add to this code to open a new window or overlay when the link is clicked?

Thanks in advance for your help

I tried targetblank a.url new window but the result was unsuccessful