<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>
<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.
myVid=document.getElementById("video1");
alert(myVid.defaultPlaybackRate);
myVid.defaultPlaybackRate=0.5;