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<!DOCTYPE html> <html> <body> <p>本例使用 addEventListener() 方法将 "canplaythrough" 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("canplaythrough", myFunction); function myFunction() { alert("Can start playing video"); } </script> </body> </html>