W3Schools 在线编辑工具（TIY） V3.0
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<!DOCTYPE html> <html> <body> <button onclick="getPlaySpeed()" type="button">默认的播放速度是多少？</button> <button onclick="setPlaySpeed()" type="button">把视频设置为慢速播放</button> <br /> <br /> <video id="video1" controls="controls"> <source src="/example/html5/mov_bbb.mp4" type="video/mp4"> <source src="/example/html5/mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> myVid=document.getElementById("video1"); function getPlaySpeed() { alert(myVid.defaultPlaybackRate); } function setPlaySpeed() { myVid.defaultPlaybackRate=0.5; myVid.load(); } </script> </body> </html>