tryjsref_onvolumechange_volume 在线代码实例

实例代码( Tip: 登录后体验更佳 )
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<!DOCTYPE html> 
<html> 
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body> 
<video id="myVideo" width="320" height="240" controls>
    <source src="/statics/demosource/movie.mp4" type="video/mp4">
    <source src="/statics/demosource/movie.ogg" type="video/ogg">
    您的浏览器不支持 HTML5 video。
</video>
<p>点击以下按钮修改音量值，或者点击右边的音量按钮来调整音量。</p>
<button onclick="setHalfVolume()" type="button">设置音量为 0.2</button>
<button onclick="setFullVolume()" type="button"设置音量为 1.0</button>
<p id="demo"></p>
<script>
// 获取 id="myVideo" 的 video 元素
var x = document.getElementById("myVideo");
// 向视频添加 "volumechange" 事件
x.addEventListener("volumechange", getVolume);
// 显示 id="demo" 的 p 元素中视频的音量
function getVolume() { 
    document.getElementById("demo").innerHTML = "视频音量为: " + x.volume;
} 
// 设置音量为 0.2
function setHalfVolume() { 
    x.volume = 0.2;
} 
//  设置音量为 1.0 (最大)
function setFullVolume() { 
    x.volume = 1.0;
} 
</script> 
 
 
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运行结果
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