Web效果：实现在网页上插入音频条。
HTML代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>编程题</title>
</head>
<body>
<audio controls="controls" src="https://document.youkeda.com/P3-1-HTML-CSS/1.2/nocturne.mp3">
您的浏览器不支持audio标签
</audio>
</body>
</html>