<!DOCTYPE html>
<html>
<body>
<video id="myVideo" width="640" height="360" controls>
<source src="/i/video/forest.mp4" type="video/mp4">
<source src="/i/video/forest.ogg" type="video/ogg">
您的浏览器不支持 video 标签。
</video>
<p>单击按钮可获取或设置视频的音量。</p>
<button onclick="getVolume()" type="button">音量是多少</button>
<button onclick="setHalfVolume()" type="button">将音量设置为 0.2</button>
<button onclick="setFullVolume()" type="button">将音量设置为 1.0</button>
<script>
var x = document.getElementById("myVideo");
function getVolume() { alert(x.volume);
}
function setHalfVolume() { x.volume = 0.2;
}
function setFullVolume() { x.volume = 1.0;
}
</script>
</body>
</html>