html运行实例（event_onloadedmetadata

代码示例：（标识：event_onloadedmetadata_html）

<!DOCTYPE html> 
<html> 
<body> 

<p>本例演示如何将 "onloadedmetadata" 事件分配给 video 元素。</p>

<video controls onloadedmetadata="myFunction()">
  <source src="/static/demo/video/shanghai.mp4" type="video/mp4">
  Your browser does not support HTML5 video.
</video>

<script>
function myFunction() {
  alert("Meta data for video loaded");
}
</script>

</body> 
</html>