问PySide2及其支持的addToJavaScriptWindowObject

EN

class AppManager(QtCore.QObject):
    '''
    methods of AppObject will be available from javascript
    '''
    def __init__(self, webview):
        QtCore.QObject.__init__(self)


class WebView(QWebEngineView):
    def __init__(self, parent=None):
        QWebEngineView.__init__(self, parent)
        self.setPage(WebEnginePage(self))

    def contextMenuEvent(self, event):
        pass


class AppWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.view = WebView(self)
        self.page = self.view.page()
        self.app_manager = AppManager(self.view)
        self.page.mainFrame().addToJavaScriptWindowObject('app_manager', self.app_manager)
        # ERROR in above line !!!