​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><br>
​
<button onclick="getMuted()" type="button">视频默认静音了吗？</button>
<button onclick="setToMuted()" type="button">设置视频默认静音，并重新加载视频</button>
​
<script>
var x = document.getElementById("myVideo");
function getMuted() { 
  alert(x.defaultMuted);
} 
​
function setToMuted() { 
  x.defaultMuted = true;
  x.load()
} 
</script> 
​
</body> 
</html>
​