I'm struggling to save an audio file from a web page using Javascript and XMLHTTPRequest -

i trying build chrome extension download of anchor tags point .wav file given page. using filesaver.js. problem downloaded files contain no data , 'undefined'. code follows (urllist array contains urls end in .wav):

var xhrlist = []; urllist.foreach(function (url, index) {     xhrlist[index] = new xmlhttprequest();     xhrlist[index].open('get',url,true);     xhrlist[index].responsetype = 'blob';      xhrlist[index].onreadystatechange = function (e) {         if (this.readystate == 4 && this.status == 200) {              var blob = new blob([this.response], {type:'audio/wav'});              saveas(blob, url);          }      }     xhrlist[index].send(); }); 

i've tried looking @ few solutions haven't had luck them. appreciated.

reloading extension did trick.