​x
 
<!DOCTYPE html>
<html>
<body>
​
<video id="myVideo" width="640" height="360" controls src="/i/video/shanghai.mp4">
  您的浏览器不支持 video 标签。
</video>
​
<p>单击该按钮可更改视频的 URL。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
var x = document.getElementById("myVideo");
​
function myFunction() { 
  x.src = "/i/video/beijing.mp4";
  x.load();
  document.getElementById("demo").innerHTML = "首都 CBD 延时摄影";
}
</script>
​
</body>
</html>
​