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<!DOCTYPE html> <html> <body> <video controls onloadedmetadata="myFunction()"> <source src="mov_bbb.mp4" type="video/mp4"> <source src="mov_bbb.ogg" type="video/ogg"> 您的浏览器不支持 HTML5 video 视频。 </video> <p>视频由 <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a> 提供。</p> <script> function myFunction() { alert("加载视频的元数据"); } </script> </body> </html>