update event

Signed-off-by: Ntianyu <tianyu55@h-partners.com>

zh-cn/application-dev/reference/arkui-ts/ts-universal-events-key.md

@@ -56,3 +56,5 @@ struct KeyEventExample {
   }
 }
 ```
+
+ ![keyEvent](figures/keyEvent.png) 
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zh-cn/application-dev/reference/arkui-ts/ts-universal-focus-event.md

@@ -71,3 +71,5 @@ struct FocusEventExample {
   }
 }
 ```
+
+ ![focus](figures/focus.png) 
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zh-cn/application-dev/reference/arkui-ts/ts-universal-mouse-key.md

+
+
+
+
 # 鼠标事件
 
 在鼠标的单个动作触发多个事件时，事件的顺序是固定的，鼠标事件默认透传。
@@ -104,3 +108,13 @@ struct MouseEventExample {
   }
 }
 ```
+
+示意图：
+
+鼠标悬浮时改变文本内容与背景颜色：
+
+ ![mouse](figures/mouse.png) 
+
+鼠标点击时：
+
+![mouse1](figures/mouse1.png)
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