第二个视频保持循环，在第一次调用结束后 - youtube API？

Question

我会撒谎开始使用youtube API完成另一个视频播放器。但是当我按照文档并尝试通过“onStateChange”进行操作时，第二个玩家会继续循环。

我知道通过使用它，使函数全局，但如何隔离这个函数，所以它只会听'player1的ENDED状态？

谢谢！

function onPlayerStateChange(event) {
  if (event.data == YT.PlayerState.ENDED) {

    slide4();

     }
  } 



  //slide 2

  var tag = document.createElement('script');  

  tag.src = "https://www.youtube.com/iframe_api";
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);


  var player;
  function onYouTubeIframeAPIReady() {

  player = new YT.Player('player', {
  height: '820',
  width: '707',
  videoId: 'NTq1WLKuOI4',
  playerVars: {'controls':1, 'rel':0,},
  events: {
     'onReady': onPlayerReady,
     'onStateChange': onPlayerStateChange
        }
    });

  player2 = new YT.Player('player2', {
  height: '820',
  width: '707',
  videoId: 'AQx1UjLv3Ps',
  playerVars: {'controls':1, 'rel':0,},
  events: {
     'onReady': onPlayerReady,
     'onStateChange': onPlayerStateChange
        }
    });

  player3 = new YT.Player('player3', {
  height: '820',
  width: '707',
  videoId: 'D4zRMA28UGI',
  playerVars: {'controls':1, 'rel':0,},
  events: {
     'onReady': onPlayerReady,
     'onStateChange': onPlayerStateChange
        }
    });     
  }    

   function onPlayerReady(event) {
   player.playVideo();
  }


  // 5. The API calls this function when the player's state changes.

  function onPlayerStateChange(event) {
  if (event.data == YT.PlayerState.ENDED) {

    slide4();

     }
  }    




    //slide 4
    var slide4 = function(){          
    player2.playVideo();      


    }