pdf dl

/*
    Download multiple PDF from WebSite

    You need to disable Chrome PDF Viewer,
    and unblock multiple file downloads in a Site

*/
var origin = document.getElementsByTagName("a");
var a = Array.from(origin);

function sleep(milliseconds) {
    /* https://www.sitepoint.com/delay-sleep-pause-wait/ */
  const date = Date.now();
  let currentDate = null;
  do {
    currentDate = Date.now();
  } while (currentDate - date < milliseconds);
}

a.forEach(function(elem, index)
{
    var pos;
    if (elem.href.endsWith(".pdf"))
    {
        pos = a[index].href.lastIndexOf("/");
        pos++;
        origin[index].setAttribute("download", elem.href.substring(pos));
        origin[index].target = "_blank";
        console.log("click on", origin[index]);
        origin[index].click();
        console.log(elem.href.substring(pos), index);
        sleep(2000);
    }
});