WPF Button

参考：

https://blog.csdn.net/qq_43024228/article/details/104886221

https://www.cnblogs.com/xiaomingg/p/8699125.html

 动画效果：

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<Window.Resources>         <Style TargetType="Button">             <Style.Triggers>                 <!--事件触发器-->                 <EventTrigger RoutedEvent="MouseEnter">                     <BeginStoryboard>                         <Storyboard>                             <DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="0.1" Duration="0:0:3"></DoubleAnimation>                         </Storyboard>                     </BeginStoryboard>                 </EventTrigger>             </Style.Triggers>         </Style>     </Window.Resources>