解决audio在苹果机播放无声音

        // audio音频
        var audio = document.getElementById("bgmusic");
        if (typeof WeixinJSBridge == "object" && typeof WeixinJSBridge.invoke == "function") {  // IOS
            WeixinJSBridge.invoke('getNetworkType', {}, function (res) {

                audio.play();
            });
        }else{  // Android
            audio.play();
        }