Youtube Iframe API - 视频未加载

Question

编辑：这是 JSFiddle：http://jsfiddle.net/sr4u1b0a

我正在尝试弄清楚如何使用 YouTube API。我是这方面的新手，所以如果有一个简单的解决方案，我很抱歉。

我相信我添加了所有必要的代码以使其正常工作，但它不会加载视频。

https://codepen.io/brianpensinger/pen/zdxzjj

头：

<script src="https://youtube.com/iframe_api" type="text/javascript"></script>

<script type="text/javascript">
    var player2;
    function onYouTubeIframeAPIReady() {
      player2 = new YT.Player("video-placeholder2", {
        width: 1920,
        height: 1080,
        videoId: "iM_KMYulI_s",
        playerVars: {
          modestbranding: 1,
          rel: 0
        },
        events: {
          onReady: initialize
        }
      });
    }

    function initialize() {
      setPlaybackQuality(highres);
      loadVideoById(iM_KMYulI_s, parseInt(0), highres);
      setPlaybackRate(2);
    }
  </script>
  <script type="text/javascript">
    var player;

    function onYouTubeIframeAPIReady() {
      player = new YT.Player("video-placeholder", {
        width: 1920,
        height: 1080,
        videoId: "iM_KMYulI_s",
        playerVars: {
          modestbranding: 1,
          rel: 0
        },
        events: {
          onReady: initialize
        }
      });
    }

    function initialize() {
      setPlaybackQuality(highres);
      loadVideoById(iM_KMYulI_s, parseInt(0), highres);
      setPlaybackRate(2);
    }
  </script>

Answer 1

更新，我改为通过这个脚本加载，它工作了！

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

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