udpate ts-event-configuration.md (7484)

Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

en/application-dev/ui/ts-event-configuration.md

 # Event Configuration
 
-
-You can use event methods to configure events supported by components.
+You can use event methods to configure events supported by components. Since API version 9, you can obtain the context associated with the current component from the callback. For details, see [Obtaining the Context on an eTS Page](../ability/context-userguide.md).
 
 
 - Example of using a lambda expression to configure the event of a component:
-    
   ```ts
   // Counter is a private data variable defined in the component.
   Button('add counter')
@@ -15,8 +13,7 @@ You can use event methods to configure events supported by components.
   ```
 
 
-- When using an anonymous function expression to configure the event of a component, bind must be used to ensure that the contained components are referenced by this in the function body.
-    
+- When using an anonymous function expression to configure the event of a component, **bind** must be used to ensure that the contained components are referenced by **this** in the function body.
   ```ts
   // Counter is a private data variable defined in the component.
   Button('add counter')
@@ -27,14 +24,13 @@ You can use event methods to configure events supported by components.
 
 
 - Example of using a component's member function to configure the event of the component:
-    
   ```ts
   myClickHandler(): void {
       // do something
   }
-  
+
   ...
-  
+
   Button('add counter')
     .onClick(this.myClickHandler)
   ```