<audio  id=‘‘music src=‘‘ preload autoplay loop>
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> 
<script> 
//一般情况下，这样就可以自动播放了
var audio = document.getElementById("music");
audio.play(); 
//微信必须加入Weixin JSAPI的WeixinJSBridgeReady才能生效 
document.addEventListener("WeixinJSBridgeReady", function () { 
    audio.play(); 
}, false); 
</script>