//为了解决webview在PivotItem里面，阻止pivot左右滑动。

                if (webView != null)

                {

                    rootGrid.Children.Remove(webView);

                    webView.NavigationCompleted -= webView_NavigationCompleted;

                    webView.NavigationFailed -= webView_NavigationFailed;

                    webView.NavigationStarting -= webView_NavigationStarting;

                    webView.DOMContentLoaded -= webView_DOMContentLoaded;

                    webView.ScriptNotify -= webView_ScriptNotify;

                }

                webView = new WebView(WebViewExecutionMode.SameThread);

                webView.SetValue(Grid.RowProperty, );

                webView.Visibility = Visibility.Collapsed;

                webView.NavigationCompleted += webView_NavigationCompleted;

                webView.NavigationFailed += webView_NavigationFailed;

                webView.NavigationStarting += webView_NavigationStarting;

                webView.DOMContentLoaded += webView_DOMContentLoaded;

                webView.ScriptNotify += webView_ScriptNotify;

                rootGrid.Children.Add(webView);