/// <summary>
        /// 载入页面时的动画效果,渐变下沉
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void Page_Loaded(object sender, RoutedEventArgs e)
        {
            float centerX = (float)Window.Current.Bounds.Width / 2;
            float centerY = (float)Window.Current.Bounds.Width / 2;

            await BackgroundPic.Scale(scaleX : 1.5f, scaleY : 1.5f, centerX : centerX, centerY : centerY, duration : 0).StartAsync();

            var animBG = BackgroundPic.Scale(scaleX: 1f, scaleY: 1f, centerX: centerX, centerY: centerY)
                         .Blur(value: 15);

            animBG.SetDurationForAll(10000);
            animBG.Start();

            await Logo.Fade(value : 0, duration : 0).StartAsync();

            await LoginAsVisitorPanel.Fade(value : 0, duration : 0).StartAsync();

            await LoginAsAdminPanel.Fade(value : 0, duration : 0).StartAsync();

            var animLogo         = Logo.Offset(offsetY: 20).Fade(value: 1).SetDurationForAll(3000).SetDelayForAll(1000);
            var animAdminPanel   = LoginAsAdminPanel.Offset(offsetY: 20).Fade(value: 1).SetDurationForAll(3000).SetDelayForAll(2000);
            var animVisitorPanel = LoginAsVisitorPanel.Offset(offsetY: 20).Fade(value: 1).SetDurationForAll(3000).SetDelayForAll(2500);

            animLogo.Start();
            animVisitorPanel.Start();
            animAdminPanel.Start();

            CheckNewVersion();
        }