如何在Javascript中显示视频中的下载按钮

<video id="myVideo" controls>
  <source src="path/to/video.mp4" type="video/mp4">
</video>

var video = document.getElementById("myVideo");

var downloadBtn = document.createElement("a");
downloadBtn.innerHTML = "下载视频";
downloadBtn.href = video.src;
downloadBtn.download = "video.mp4";

video.parentNode.appendChild(downloadBtn);

<video id="myVideo" controls>
  <source src="path/to/video.mp4" type="video/mp4">
</video>

<script>
  var video = document.getElementById("myVideo");

  var downloadBtn = document.createElement("a");
  downloadBtn.innerHTML = "下载视频";
  downloadBtn.href = video.src;
  downloadBtn.download = "video.mp4";

  video.parentNode.appendChild(downloadBtn);
</script>