<html>
<body>
<video id="myVideo" controls autoplay>
<source id="mp4_src" src="mov_bbb.mp4" type="video/mp4">
<source id="ogg_src" src="mov_bbb.ogg" type="video/ogg">
您的浏览器不支持 video 标签。
</source></source></video>
<p>点击按钮修改视频资源，并重新加载。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction()
{
document.getElementById("mp4_src").src = "movie.mp4";
document.getElementById("ogg_src").src = "movie.ogg";
document.getElementById("myVideo").load();
}
</script>
<p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>
</body>
</html>