H5頁面播放音樂其實很簡單，只需要用<audio>這個標籤就行十分方便。

路徑選在音樂所在位置就行了。

<audio id="bgMusic" src="js/2.mp3" autoplay preload loop="loop"></audio>

<a class="play" id="audioBtn" style="cursor:pointer;" onclick="autoPlay()"></a>
                    <audio id="bgMusic" src="js/2.mp3" autoplay preload loop="loop"></audio>
 

.pause {
            height: 50px;
            background: url(images/musicbtn.png) no-repeat;
            display: block;
            background-position: 0 bottom;
        }

        .play {
            height: 50px;
            background: url(images/musicbtn.png) no-repeat;
            display: block;
        }
 

JS:

function autoPlay() {
            var myAuto = document.getElementById('bgMusic');
            var btn = document.getElementById('audioBtn');
            if (myAuto.paused) {
                myAuto.play();
                btn.classList.remove("pause");
                btn.classList.add("play");
            } else {
                myAuto.pause();

                btn.classList.remove("play");
                btn.classList.add("pause");
            }

        }
 

<script type="text/javascript">
        function audioAutoPlay() {
            var audio = document.getElementById("bgMusic"),
            play = function () {
                audio.play();
                document.removeEventListener("touchstart", play, false);
            };
            audio.play();
            document.addEventListener("WeixinJSBridgeReady", function () {
                play();
            }, false);
            document.addEventListener('YixinJSBridgeReady', function () {
                play();
            }, false);
            document.addEventListener("touchstart", play, false);
        }
</script>

效果圖：