AI 编程工具xxxxxxxxxx<html><head><meta charset="utf-8"><title>高手教程(study.p2hp.com)</title></head><body><audio id="myAudio" controls> <source src="horse.ogg" type="audio/ogg"> <source src="horse.mp3" type="audio/mpeg"> 您的浏览器不支持 audio 元素。</audio><p>点击按钮获取可用音频轨道数。</p><p id="demo"></p><button onclick="myFunction()">点我</button><p><strong>注意：</strong> 目前所有主流浏览器都不支持 audioTracks 属性。</p><script>function myFunction(){ var x = document.getElementById("myAudio").audioTracks.length; document.getElementById("demo").innerHTML = x;}</script></body></html>