​x
 
<!DOCTYPE html> 
<html> 
<body> 
​
<p>我的浏览器可以播放 MP4 视频吗？
<span>
<button onclick="supportType(event,'video/mp4','avc1.42E01E, mp4a.40.2')" type="button">测试</button>
</span>
</p>
​
<script> 
function supportType(e,vidType,codType) { 
  var x = document.createElement("VIDEO");
  isSupp = x.canPlayType(vidType+';codecs="'+codType+'"');
  if (isSupp == "") {
    isSupp = "No";
  }
  e.target.parentNode.innerHTML = "答案：" + isSupp;
} 
</script> 
​
</body> 
</html>
​