Question

我今晚一直试图让背景音频工作很长时间！显示的音频标签“msAudioCategory”的HTML5属性不是有效的。这很奇怪，我无法在任何地方找到这个问题的帮助。

如果我不明白你的答案，请原谅我。我的default.js（在随机点开始使其缩短）：

 app.onactivated = function (args) {
        if (args.detail.kind === activation.ActivationKind.launch) {
            if (args.detail.previousExecutionState !== activation.ApplicationExecutionState.terminated) {

            } else {
                // TODO: This application has been reactivated from suspension.
                // Restore application state here.
            }
            args.setPromise(WinJS.UI.processAll());
        }
    };

    app.oncheckpoint = function (args) {
        // TODO: This application is about to be suspended. Save any state
        // that needs to persist across suspensions here. You might use the
        // WinJS.Application.sessionState object, which is automatically
        // saved and restored across suspension. If you need to complete an
        // asynchronous operation before your application is suspended, call
        // args.setPromise().
        // Declare a variable that you will use as an instance of an object
        var mediaControls;

        // Assign the button object to mediaControls
        mediaControls = Windows.Media.MediaControl;

        // Add an event listener for the Play, Pause Play/Pause toggle button
        mediaControls.addEventListener("playpausetogglepressed", playpausetoggle, false);
        mediaControls.addEventListener("playpressed", playbutton, false);
        mediaControls.addEventListener("pausepressed", pausebutton, false);
        mediaControls.addEventListener("stoppressed", stop, false);

        // The event handler for the play/pause button
        function playpausetoggle() {
            if (mediaControls.isPlaying === true) {
                document.getElementById("playback").pause();
            } else {
                document.getElementById("playback").play();
            }
        }

        // The event handler for the pause button
        function pausebutton() {
            document.getElementById("playback").pause();
        }

        // The event handler for the play button
        function playbutton() {
            document.getElementById("playback").play();
        }
        // The event handler for the stop button
        function stop() {
            document.getElementById("playback").pause();
            document.getElementById("playback").currentTime = 0;
        }
    };

    app.start();

}
()


);

元素标记：

 <audio id="audtag" autoplay="autoplay" msAudioCategory="BackgroundCapableMedia" src="http://-Hidden-:8000/;">

 </audio>

我很确定我已经正确配置了所有内容。我确定我有背景功能或设置的东西。但是，它仍然说音频元素属性'msAudioCategory'不是有效的HTML5。我在哪里将JavaScript放在default.js中来定义该属性？在app.start（）之后？文件中的文档让我感到困惑。

第一次制作应用程序总是很容易！

Answer 1

你在app manifest中设置了正确的声明吗？您需要添加后台任务并将任务类型设置为音频和控制通道。

我昨天在C＃样本上做了这个

后台流Windows 8？

1 个答案: