JSNotifcationWrapper *notificationWrapper;
WebViewService  * webViewService;
DownloadManager * downloadManager;
LocalAppManager * localAppManager;

auto channel = new QWebChannel(this);
channel->registerObject("notificationService", notificationWrapper);
channel->registerObject("downloadService", downloadManager);
channel->registerObject("localAppService", localAppManager);
channel->registerObject("webViewService", webViewService);
ui->webView->page()->setWebChannel(channel);

new QWebChannel(qt.webChannelTransport, function(channel) {
    var notificationService = channel.objects.notificationService;
    var downloadService = channel.objects.downloadService;
    var localAppService = channel.objects.localAppService;
    var webViewService = channel.objects.webViewService;
}

webViewService.load("http://vr.sina.com.cn”);

localAppService.isAppInstalled(0, function(isInstalled){
    if(isInstalled)
        alert("a");
    else
        alert("b");
});

// 对象.signal.connect
downloadService.progress.connect(function(progress) {
    console.log("js log: %" + progress);
});