改变视频的来源 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
</head>
<body>

  <button onclick="changeSource()" type="button">改变视频的来源</button>
  <br>
  <video id="video1" controls="controls" autoplay="autoplay">
  <source id="mp4_src" src="/examples/mov_bbb.mp4" type="video/mp4">
  <source id="ogg_src" src="/examples/mov_bbb.ogg" type="video/ogg">
  您的浏览器不支持 HTML5 video  标签。
</video>

  <script>
    myVid = document.getElementById("video1");

    function changeSource() {
      isSupp = myVid.canPlayType("video/mp4");
      if (isSupp == "") {
        myVid.src = "/examples/movie.ogg";
      } else {
        myVid.src = "/examples/movie.mp4";
      }
      myVid.load();
    }
  </script>

  <p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>

</body>
</html>
        