YouTube playlist video lister (50+ videos)

000.js

/* https://www.googleapis.com/youtube/v3/
     playlistItems?playlistId=PLTWDLMN4U1FNBJll-GvoNce8PQTuXjFYh
     &part=snippet&maxResults=50&pageToken=...
     &key=YOUR_API_KEY */

var listcur = 0, pgtok, data, videos = new Array(), vidcnt;

getvids = function() {
  for (var i = 0; i < data.items.length; i++)
  {
    videos[listcur] = data.items[i].snippet.resourceId.videoId;
    listcur++;
  }
}

var __ = new XMLHttpRequest();
//__.open("GET","https://www.googleapis.com/youtube/v3/playlistItems?playlistId=PLTWDLMN4U1FNBJll-GvoNce8PQTuXjFYh&part=snippet&key=KEY&maxResults=50",true);
__.onreadystatechange = function() {
  if (this.readyState == XMLHttpRequest.DONE && this.status === 200)
  {
    data = JSON.parse(__.responseText);
    console.log("got next "+data.pageInfo.resultsPerPage.toString()+" videos");
    getvids();
    pgtok = data.nextPageToken;
  }
}

var _ = new XMLHttpRequest();
_.open("GET","https://www.googleapis.com/youtube/v3/playlistItems?playlistId=PLTWDLMN4U1FNBJll-GvoNce8PQTuXjFYh&part=snippet&key=KEY&maxResults=50",false);
_.onreadystatechange = function() {
  if (this.readyState == XMLHttpRequest.DONE && this.status === 200)
  {
    data = JSON.parse(_.responseText);
    console.log("got first 50 videos");
    listcur = 0; vidcnt = data.pageInfo.totalResults;
    getvids(); pgtok = data.nextPageToken;
    for (var i = data.pageInfo.resultsPerPage; i < vidcnt; i += data.pageInfo.resultsPerPage) {
      __.open("GET","https://www.googleapis.com/youtube/v3/playlistItems?playlistId=PLTWDLMN4U1FNBJll-GvoNce8PQTuXjFYh&part=snippet&key=KEY&maxResults=50&pageToken="+pgtok,false);
	    __.send();
    }
    console.log("complete");
    return videos;
  }
}
_.send();

shuffle = function() {
    var a = [];
    // i couldve made my own unique rng generator but am too lazy to right now
    while(a.length < vidcnt){
        var r = Math.floor(Math.random() * vidcnt) + 1;
        if(a.indexOf(r) === -1) a.push(r);
    }
    for (i = 0; i < vidcnt; i++)
    {
        a[i] = videos[a[i]]
    }
    return a;
}