JavaScript - 如何停止 运行 音频?

JavaScript - How can I stop a running audio?

以后需要时如何停止此循环音频? (它一直在 Google Chrome 稳定、金丝雀中测试过)

var song = null;
function a() {
  song = new Audio("audio/ring.wav");
  song.controls = false;
  song.loop = true;
  song.autoplay = true;
  document.body.appendChild(song);
}  

a();
var song = null;

function a() {
  song = new Audio("audio/ring.wav");
  song.controls = false;
  song.loop = true;
  song.autoplay = true;
  document.body.appendChild(song);
}  

a();

// Pause the audio, please note there is no stop event
song.pause();