使用 iframe 和 javascript API 使 YouTube 视频全屏显示

我有一个带有隐藏控件的嵌入式 YouTube 视频：

<iframe id="ytplayer" type="text/html" width="400" height="225"
src="http://www.youtube.com/embed/dMH0bHeiRNg?rel=0&controls=0&showinfo=0
&loop=1&hd=1&modestbranding=1&enablejsapi=1&playerapiid=ytplayer"
frameborder="0" allowfullscreen></iframe>

我可以使用 youtube Javascript API 来控制它。

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

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

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

像player.playVideo()等等工作完美。现在我正在寻找一种通过 Javascript 调用使视频以全屏模式播放的方法，但我在 API 中找不到任何方法。

是否有可能（没有控件）？如果可以，如何实现？

这对我来说非常有效。您可以在此链接上找到更多详细信息：CodePen 上的演示 http://codepen.io/bfred-it/pen/GgOvLM

var player, iframe;
var $ = document.querySelector.bind(document);

// init player
function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    height: '200',
    width: '300',
    videoId: 'dQw4w9WgXcQ',
    events: {
      'onReady': onPlayerReady
    }
  });
}

// when ready, wait for clicks
function onPlayerReady(event) {
  var player = event.target;
  iframe = $('#player');
  setupListener(); 
}

function setupListener (){
$('button').addEventListener('click', playFullscreen);
}

function playFullscreen (){
  player.playVideo();//won't work on mobile

  var requestFullScreen = iframe.requestFullScreen || iframe.mozRequestFullScreen || iframe.webkitRequestFullScreen;
  if (requestFullScreen) {
    requestFullScreen.bind(iframe)();
  }
}