​x
 
<!DOCTYPE html>
<html>
<body>
​
<video id="myVideo" width="640" height="360" controls autoplay>
  <source id="mp4_src" src="/i/video/shanghai.mp4" type="video/mp4">
  <source id="ogg_src" src="/i/video/shanghai.ogg" type="video/ogg">
  您的浏览器不支持 video 标签。
</video>
​
<p>单击按钮更改视频源并重新加载视频。</p>
​
<button onclick="myFunction()">试一试</button>
​
<script>
function myFunction()  {
  document.getElementById("mp4_src").src = "/i/video/beijing.mp4";
  document.getElementById("myVideo").load();
}
</script>
​
</body>
</html>
​