autoplay background music

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css">
<ul>
  <li>
    <a><i class="fa fa-play" aria-hidden="true" id="playBtn"></i></a>
  </li>
  <li>
    <a><i class="fa fa-pause" aria-hidden="true" id="pauseBtn"></i></a>
  </li>
  <li>
    <a><i class="fa fa-stop" aria-hidden="true" id="stopBtn"></i></a>
  </li>
</ul>

JavaScript

var source = "http://trangtainhac.net/bai-hat/coi-bao-chay-doc-chua-chu-ro.2290768.html";
var audio = new Audio(); // use the constructor in JavaScript, just easier that way
audio.addEventListener("load", function() {
  audio.play();
}, true);
audio.src = source;
audio.autoplay = true; // add this

$("#playBtn").click(function() {
  audio.play();
});

$("#pauseBtn").click(function() {
  audio.pause();
});

$("#stopBtn").click(function() {
  audio.pause();
  audio.currentTime = 0;
});