Как сделать зацыкленный плей лист роликов с ютуб и вимео при помощии js?

var playlist=["0Bmhjf0rKe8","jQZtk-fCWQ4","5wosC9QLQTM"];
    var whonext=0;
    var player;
    function onYouTubePlayerAPIReady() {
        player = new YT.Player('player', {
          height: '390',
          width: '640',
          videoId: playlist[0],
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange
          }
        });
    whonext++;
    }
    function playNext(){
    if(whonext>playlist.length-1){whonext=0}
    player.loadVideoById({'videoId': playlist[whonext]});
    whonext++;
    }
    function onPlayerReady(event) {
        event.target.playVideo();
    }
    function onPlayerStateChange(event) {        
        if(event.data === 0) {            
            playNext();
        }
    }