/// <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();
}