update en/application-dev/reference/apis/js-apis-emitter.md.

Signed-off-by: Nking_he <6384784@qq.com>

en/application-dev/reference/apis/js-apis-emitter.md

 # Emitter
 
-> Note: The initial APIs of this module are supported since API version 7.
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br>
+> The initial APIs of this module are supported since API version 7.
 
 ## Modules to Import
 
@@ -18,10 +19,10 @@ Enumerates the event emit priority levels.
 
 | Name     | Value  | Description                                             |
 | --------- | ---- | ------------------------------------------------- |
-| IMMEDIATE | 0    | The event will be emitted immediately.<br>**System capability**: SystemCapability.Notification.Emitter                               |
-| HIGH      | 1    | The event will be emitted before low-priority events.<br>**System capability**: SystemCapability.Notification.Emitter                        |
-| LOW       | 2    | The event will be emitted before idle-priority events. By default, an event is in LOW priority.<br>**System capability**: SystemCapability.Notification.Emitter|
-| IDLE      | 3    | The event will be emitted after all the other events.<br>**System capability**: SystemCapability.Notification.Emitter         |
+| IMMEDIATE | 0    | The event will be emitted immediately.<br>**System capability**: SystemCapability.Notification.Emitter |
+| HIGH      | 1    | The event will be emitted before low-priority events.<br>**System capability**: SystemCapability.Notification.Emitter |
+| LOW       | 2    | The event will be emitted before idle-priority events. By default, an event is in LOW priority.<br>**System capability**: SystemCapability.Notification.Emitter |
+| IDLE      | 3    | The event will be emitted after all the other events.<br>**System capability**: SystemCapability.Notification.Emitter |
 
 ## emitter.on
 
@@ -33,10 +34,10 @@ Subscribes to an event in persistent manner. This API uses a callback to return
 
 **Parameters**
 
-| Name  | Type                               | Mandatory| Description                    |
+| Name  | Type                               | Mandatory | Description                    |
 | -------- | ----------------------------------- | ---- | ------------------------ |
-| event    | [InnerEvent](#innerevent)           | Yes  | Event to subscribe to in persistent manner.          |
-| callback | Callback\<[EventData](#eventdata)\> | Yes  | Callback used to return the event.|
+| event    | [InnerEvent](#innerevent)           | Yes  | Event to subscribe to in persistent manner. |
+| callback | Callback\<[EventData](#eventdata)\> | Yes  | Callback used to return the event. |
 
 **Example**
 
@@ -60,10 +61,10 @@ Subscribes to an event in one-shot manner and unsubscribes from it after the eve
 
 **Parameters**
 
-| Name  | Type                               | Mandatory| Description                    |
+| Name  | Type                               | Mandatory | Description                    |
 | -------- | ----------------------------------- | ---- | ------------------------ |
-| event    | [InnerEvent](#innerevent)           | Yes  | Event to subscribe to in one-shot manner.          |
-| callback | Callback\<[EventData](#eventdata)\> | Yes  | Callback used to return the event.|
+| event    | [InnerEvent](#innerevent)           | Yes  | Event to subscribe to in one-shot manner. |
+| callback | Callback\<[EventData](#eventdata)\> | Yes  | Callback used to return the event. |
 
 **Example**
 
@@ -87,9 +88,9 @@ Unsubscribes from an event.
 
 **Parameters**
 
-| Name | Type  | Mandatory| Description  |
+| Name | Type  | Mandatory | Description |
 | ------- | ------ | ---- | ------ |
-| eventId | number | Yes  | Event ID.|
+| eventId | number | Yes | Event ID. |
 
 **Example**
 
@@ -107,10 +108,10 @@ Emits an event to the event queue.
 
 **Parameters**
 
-| Name| Type                     | Mandatory| Description          |
+| Name| Type                     | Mandatory| Description |
 | ------ | ------------------------- | ---- | -------------- |
-| event  | [InnerEvent](#innerevent) | Yes  | Event to emit.    |
-| data   | [EventData](#eventdata)   | No  | Data carried by the event.|
+| event  | [InnerEvent](#innerevent) | Yes | Event to emit. |
+| data   | [EventData](#eventdata)   | No | Data carried by the event. |
 
 **Example**
 
@@ -133,8 +134,8 @@ Describes an intra-process event.
 
 | Name    | Type                       | Readable| Writable| Description                              |
 | -------- | ------------------------------- | ---- | ---- | ---------------------------------- |
-| eventId  | number                          | Yes  | Yes  | Event ID, which is used to identify an event.<br>**System capability**: SystemCapability.Notification.Emitter|
-| priority | [EventPriority](#eventpriority) | Yes  | Yes  | Emit priority of the event.<br>**System capability**: SystemCapability.Notification.Emitter                |
+| eventId  | number                          | Yes  | Yes | Event ID, which is used to identify an event.<br>**System capability**: SystemCapability.Notification.Emitter |
+| priority | [EventPriority](#eventpriority) | Yes  | Yes | Emit priority of the event.<br>**System capability**: SystemCapability.Notification.Emitter |
 
 ## EventData
 
@@ -142,4 +143,4 @@ Describes the data passed in the event.
 
 | Name| Type          | Readable| Writable| Description          |
 | ---- | ------------------ | ---- | ---- | -------------- |
-| data | [key: string]: any | Yes  | Yes  | Data carried by the event. The data type can be String, Integer, or Boolean.<br>**System capability**: SystemCapability.Notification.Emitter|
+| data | [key: string]: any | Yes | Yes | Data carried by the event. The data type can be String, Integer, or Boolean.<br>**System capability**: SystemCapability.Notification.Emitter |