如何在嵌入式YouTube视频播放结束时取消隐藏<div>

<div id="player"></div>

<script>
  // 在这里插入YouTube视频的嵌入代码
</script>

<script src="https://www.youtube.com/iframe_api"></script>

var player;

function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    events: {
      'onStateChange': onPlayerStateChange
    }
  });
}

function onPlayerStateChange(event) {
  if (event.data == YT.PlayerState.ENDED) {
    // 在视频播放结束时执行取消隐藏<div>的操作
    var divElement = document.getElementById('player');
    divElement.style.display = 'block';
  }
}

window.onYouTubeIframeAPIReady = onYouTubeIframeAPIReady;