x
 
<!DOCTYPE html>
<html>
<body>
<video id="myVideo" width="640" height="360" controls>
  <source src="/i/video/shanghai.mp4" type="video/mp4">
  <source src="/i/video/shanghai.ogg" type="video/ogg">
  您的浏览器不支持 video 标签。
</video>
<p>单击按钮可查看视频是否已结束。</p>
<p><b>提示:</b>请点击播放按钮,并在视频开头和结尾点击“试一试”按钮。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myVideo").ended;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>