移动端全兼容支持自动播放

    function audioAutoPlay(id){
        var audio = document.getElementById(id),
                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);
    }