<html> <body> <p>本例使用 addEventListener() 方法将 "canplay" 事件附加到 video 元素。</p><video controls id="myVideo"> <source src="/i/photo/shanghai.mp4" type="video/mp4"> Your browser does not support HTML5 video.</video><script>document.getElementById("myVideo").addEventListener("canplay", myFunction);function myFunction() { alert("Can start playing video");}</script></body> </html>