<html> <body> <p>本例演示如何将 "ondurationchange" 事件分配给 video 元素。</p><video controls ondurationchange="myFunction()"> <source src="/i/photo/shanghai.mp4" type="video/mp4"> Your browser does not support HTML5 video.</video><script>function myFunction() { alert("The video duration has changed");}</script></body> </html>