<html>
<body>
<video id="myVideo" controls src="movie.ogg">
您的浏览器不支持 video 标签。
</video>
<p>点击按钮修改视频的 URL。</p>
<p id="demo"></p>
<button onclick="myFunction()">点我</button>
<script>
var x = document.getElementById("myVideo");
function myFunction()
{
isSupp = x.canPlayType("video/mp4");
if (isSupp == "")
{
x.src = "mov_bbb.ogg";
}
else
{
x.src = "mov_bbb.mp4";
}
x.load();
document.getElementById("demo").innerHTML = "Video Courtesy of Big Buck Bunny - www.bigbuckbunny.org";
}
</script>
</body>
</html>