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<!DOCTYPE html> 
<html> 
<body> 
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<p>本例演示如何将 "onvolumechange" 事件分配给 video 元素。</p>
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<p>请尝试更改右下角的音量。</p>
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<video controls onvolumechange="myFunction()">
  <source src="/i/photo/shanghai.mp4" type="video/mp4">
  Your browser does not support HTML5 video.
</video>
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<script>
function myFunction() {
  alert("The volume has been changed!");
}
</script>
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</body> 
</html>
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