iframe 嵌入 Youtube 自動播放 , 靜音

iframe_youtube_mute.html

<iframe class="youtube-player" id="player" type="text/html" src="http://www.youtube.com/embed/EnErifh93hM?autoplay=1" height="600px" width="400px"></iframe>

 <!-- 1. The <div> tag will contain the <iframe> (and video player) -->
<div id="player"></div>
<script>      // 2. This code loads the IFrame Player API code asynchronously.
      var tag = document.createElement('script');
      tag.src = "http://www.youtube.com/player_api";
      var firstScriptTag = document.getElementsByTagName('script')[0];
      firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

      // 3. This function creates an <iframe> (and YouTube player)
      //    after the API code downloads.
      var player;
      function onYouTubePlayerAPIReady() {
        player = new YT.Player('player', {
          playerVars: { 'autoplay': 1, 'controls': 1,'autohide':1,'wmode':'opaque' },
          videoId: 'JW5meKfy3fY',
          events: {
            'onReady': onPlayerReady}
        });
      }

      // 4. The API will call this function when the video player is ready.
      function onPlayerReady(event) {
        event.target.mute();
      }
</script>