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<!DOCTYPE html> <html> <body> <video id="myVideo" width="640" height="360" controls> <source src="/i/video/shanghai.mp4" type="video/mp4"> <source src="/i/video/shanghai.ogg" type="video/ogg"> 您的浏览器不支持 video 标签。 </video><br> <button onclick="getPlaySpeed()" type="button">默认播放速度是多少？</button> <button onclick="setPlaySpeed()" type="button">设置更快的视频播放速度</button> <script> var x = document.getElementById("myVideo"); function getPlaySpeed() { alert(x.defaultPlaybackRate); } function setPlaySpeed() { x.defaultPlaybackRate = 5; x.load(); } </script> </body> </html>