add js-apis-device-manager EN against 6044+6564

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

en/application-dev/reference/apis/js-apis-device-manager.md

 # Device Management
 
-> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
+The **DeviceManager** module provides APIs for distributed device management.
+
+System applications can call the APIs to do the following:
+
+- Subscribe to or unsubscribe from device state changes.
+- Discover peripheral untrusted devices.
+- Authenticate or deauthenticate a device.
+- Query the trusted device list.
+- Query local device information, including the device name, type, and ID.
+
+> **NOTE**
+>
 > - The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 > - The APIs of this module are system APIs and cannot be called by third-party applications.
 
 
-## Modules to import:
+## Modules to Import
 
 ```
 import deviceManager from '@ohos.distributedHardware.deviceManager';
@@ -21,10 +32,10 @@ Creates a **DeviceManager** instance.
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | bundleName | string | Yes| Bundle name of the application.|
-  | callback | AsyncCallback<[DeviceManager](#devicemanager)> | Yes| Callback invoked to return the **DeviceManager** instance created.|
+  | Name       | Type                                      | Mandatory  | Description                                  |
+  | ---------- | ---------------------------------------- | ---- | ------------------------------------ |
+  | bundleName | string                                   | Yes   | Bundle name of an application.                          |
+  | callback   | AsyncCallback<[DeviceManager](#devicemanager)> | Yes   | Callback used to return the **DeviceManager** instance created.|
 
 - Example
   ```
@@ -34,23 +45,22 @@ Creates a **DeviceManager** instance.
           return;
       }
       console.info("createDeviceManager success");
-      this.dmInstance = data;
+      let dmInstance = data;
   });
   ```
 
+## DeviceInfo
 
-## DeviceStateChangeAction
-
-Enumerates the device states.
+Defines device information.
 
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
-| Name| Default Value| Description|
-| -------- | -------- | -------- |
-| ONLINE | 0 | The device is online.|
-| READY | 1 | The device is ready, and the device information has been synchronized.|
-| OFFLINE | 2 | The device is offline.|
-| CHANGE | 3 | The device information is changed.|
+| Name                    | Type                       | Mandatory  | Description      |
+| ---------------------- | ------------------------- | ---- | -------- |
+| deviceId               | string                    | Yes   | Unique identifier of a device.|
+| deviceName             | string                    | Yes   | Device name.   |
+| deviceType             | [DeviceType](#devicetype) | Yes   | Device type.   |
+| networkId<sup>8+</sup> | string                    | Yes   | Network ID of the device. |
 
 
 ## DeviceType
@@ -59,28 +69,120 @@ Enumerates the device types.
 
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
-| Name| Default Value| Description|
-| -------- | -------- | -------- |
+| Name          | Default Value | Description  |
+| ------------ | ---- | ---- |
 | SPEAKER      | 0x0A | Smart speaker.|
-| PHONE | 0x0E | Phone.|
-| TABLET | 0x11 | Tablet.|
+| PHONE        | 0x0E | Phone.  |
+| TABLET       | 0x11 | Tablet.  |
 | WEARABLE     | 0x6D | Wearable.|
-| TV | 0x9C | Smart TV.|
-| CAR | 0x83 | Car.|
+| TV           | 0x9C | Smart TV. |
+| CAR          | 0x83 | Car.   |
 | UNKNOWN_TYPE | 0    | Unknown device type.|
 
 
-## DeviceInfo
+## DeviceStateChangeAction
 
-Defines device information.
+Enumerates the device states.
 
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| deviceId | number | Yes| Unique device identifier.|
-| deviceName | string | Yes| Device name.|
-| deviceType | number | Yes| Device type.|
+| Name     | Default Value | Description             |
+| ------- | ---- | --------------- |
+| ONLINE  | 0    | The device is online.          |
+| READY   | 1    | The device is ready, and the device information has been synchronized.|
+| OFFLINE | 2    | The device is offline.          |
+| CHANGE  | 3    | The device information is changed.        |
+
+## SubscribeInfo
+
+Defines subscription information.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name           | Type                               | Mandatory  | Description               |
+| ------------- | --------------------------------- | ---- | ----------------- |
+| subscribeId   | number                            | Yes   | Subscription ID, used to identify a device discovery period.|
+| mode          | [DiscoverMode ](#discovermode)    | No   | Device discovery mode.            |
+| medium        | [ExchangeMedium](#exchangemedium) | No   | Medium used for device discovery.            |
+| freq          | [ExchangeFreq](#exchangefreq)     | No   | Frequency of device discovery.            |
+| isSameAccount | boolean                           | No   | Whether the same account is used on the discovered device.           |
+| isWakeRemote  | boolean                           | No   | Whether to wake up the discovered device.          |
+| capability    | [SubscribeCap](#subscribecap)     | No   | Discovery capability.            |
+
+
+## DiscoverMode 
+
+Enumerates the device discovery modes.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name                   | Default Value | Description   |
+| --------------------- | ---- | ----- |
+| DISCOVER_MODE_PASSIVE | 0x55 | Passive discovery.|
+| DISCOVER_MODE_ACTIVE  | 0xAA | Active discovery.|
+
+
+## ExchangeMedium 
+
+Enumerates the media used for device discovery.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name  | Default Value | Description       |
+| ---- | ---- | --------- |
+| AUTO | 0    | Automatic.  |
+| BLE  | 1    | Bluetooth.  |
+| COAP | 2    | Wi-Fi.|
+| USB  | 3    | USB. |
+
+## ExchangeFreq 
+
+Enumerates the device discovery frequencies.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name        | Default Value | Description   |
+| ---------- | ---- | ----- |
+| LOW        | 0    | Low frequency. |
+| MID        | 1    | Medium frequency. |
+| HIGH       | 2    | High frequency. |
+| SUPER_HIGH | 3    | Ultra-high frequency.|
+
+
+## SubscribeCap 
+
+Enumerates the discovery capabilities.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name                       | Default Value | Description            |
+| ------------------------- | ---- | -------------- |
+| SUBSCRIBE_CAPABILITY_DDMP | 0    | DDMP capability. This will be deprecated later.|
+| SUBSCRIBE_CAPABILITY_OSD  | 1    | OSD capability.        |
+
+
+## AuthParam
+
+Defines the authentication parameters.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name       | Type                  | Mandatory  | Description        |
+| --------- | -------------------- | ---- | ---------- |
+| authType  | number               | Yes   | Authentication type.     |
+| extraInfo | {[key:string] : any} | No   | Extended field.|
+
+## AuthInfo
+
+Defines authentication information.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+| Name       | Type                  | Mandatory  | Description        |
+| --------- | -------------------- | ---- | ---------- |
+| authType  | number               | Yes   | Authentication type.     |
+| token     | number               | Yes   | Authentication token.  |
+| extraInfo | {[key:string] : any} | No   | Extended field.|
 
 
 ## DeviceManager
@@ -92,12 +194,12 @@ Provides APIs to obtain information about trusted devices and local devices. Bef
 
 release(): void
 
-Releases the **DeviceManager** instance that is no longer used.
+Releases this **DeviceManager** instance when it is no longer used.
 
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - Example
-  ```
+  ```js
   dmInstance.release();
   ```
 
@@ -111,16 +213,258 @@ Obtains all trusted devices synchronously.
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - Return value
-  | Name| Description|
-  | -------- | -------- |
+  | Name                                    | Description       |
+  | -------------------------------------- | --------- |
   | Array&lt;[DeviceInfo](#deviceinfo)&gt; | List of trusted devices obtained.|
 
 - Example
-  ```
+  ```js
   var deviceInfoList = dmInstance.getTrustedDeviceListSync();
   ```
 
 
+### getTrustedDeviceList<sup>8+</sup>
+
+getTrustedDeviceList(callback:AsyncCallback&lt;Array&lt;DeviceInfo&gt;&gt;): void
+
+Obtains all trusted devices. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description                   |
+  | -------- | ---------------------------------------- | ---- | --------------------- |
+  | callback | AsyncCallback&lt;Array&lt;[DeviceInfo](#deviceinfo)&gt;&gt; | Yes   | Callback used to return the list of trusted devices.|
+
+- Example
+  ```js
+  dmInstance.getTrustedDeviceList((err, data) => {
+      console.log("getTrustedDeviceList err: " + JSON.stringify(err));
+      console.log('get trusted device info: ' + JSON.stringify(data));
+    }
+  );
+  ```
+
+### getTrustedDeviceList<sup>8+</sup>
+
+getTrustedDeviceList(): Promise&lt;Array&lt;DeviceInfo&gt;&gt;
+
+Obtains all trusted devices. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- Return value
+  | Type                                      | Description                   |
+  | ---------------------------------------- | --------------------- |
+  | Promise&lt;Array&lt;[DeviceInfo](#deviceinfo)&gt;&gt; | Promise used to return the list of trusted devices.|
+
+- Example
+  ```js
+  dmInstance.getTrustedDeviceList().then((data) => { 
+      console.log('get trusted device info: ' + JSON.stringify(data));
+  }).catch((err) => {
+      console.log("getTrustedDeviceList err: " + JSON.stringify(err));
+  });
+  ```
+
+### getLocalDeviceInfoSync<sup>8+</sup>
+
+getLocalDeviceInfoSync(): [DeviceInfo](#deviceinfo)
+
+Obtains local device information synchronously.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- Return value
+  | Name                                    | Description       |
+  | -------------------------------------- | --------- |
+  | Array&lt;[DeviceInfo](#deviceinfo)&gt; | List of local devices obtained.|
+
+- Example
+  ```js
+  var deviceInfo = dmInstance.getLocalDeviceInfoSync();
+  ```
+
+
+### getLocalDeviceInfo<sup>8+</sup>
+
+getLocalDeviceInfo(callback:AsyncCallback&lt;DeviceInfo&gt;): void
+
+Obtains local device information. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description       |
+  | -------- | ---------------------------------------- | ---- | --------- |
+  | callback | AsyncCallback&lt;[DeviceInfo](#deviceinfo)&gt; | Yes   | Callback used to return the local device information.|
+
+- Example
+  ```js
+  dmInstance.getLocalDeviceInfo((err, data) => {
+      console.log("getLocalDeviceInfo err: " + JSON.stringify(err));
+      console.log('get local device info: ' + JSON.stringify(data));
+    }
+  );
+  ```
+
+### getLocalDeviceInfo<sup>8+</sup>
+
+getLocalDeviceInfo(): Promise&lt;DeviceInfo&gt;
+
+Obtains local device information. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- Return value
+  | Type                                      | Description                   |
+  | ---------------------------------------- | --------------------- |
+  | Promise&lt;[DeviceInfo](#deviceinfo)&gt; | Promise used to return the local device information.|
+
+- Example
+  ```js
+  dmInstance.getLocalDeviceInfo().then((data) => { 
+      console.log('get local device info: ' + JSON.stringify(data));
+  }).catch((err) => {
+      console.log("getLocalDeviceInfo err: " + JSON.stringify(err));
+  });
+  ```
+
+### startDeviceDiscovery
+
+startDeviceDiscovery(subscribeInfo: SubscribeInfo): void
+
+Starts to discover peripheral devices.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name           | Type                           | Mandatory  | Description   |
+  | ------------- | ------------------------------- | ---- | ----- |
+  | subscribeInfo | [SubscribeInfo](#subscribeinfo) | Yes   | Subscription information.|
+
+- Example
+  ```js
+  // Automatically generate a unique subscription ID.
+  var subscribeId = Math.floor(Math.random() * 10000 + 1000);
+  var subscribeInfo = {
+      "subscribeId": subscribeId,
+      "mode": 0xAA, // Active discovery
+      "medium": 0, // Automatic. Multiple media can be used for device discovery.
+      "freq": 2, // High frequency
+      "isSameAccount": false,
+      "isWakeRemote": false,
+      "capability": 1
+  };
+  dmInstance.startDeviceDiscovery(subscribeInfo); // The deviceFound callback is invoked to notify the application when a device is discovered.
+  ```
+
+### stopDeviceDiscovery
+
+stopDeviceDiscovery(subscribeId: number): void
+
+Stops device discovery.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name         | Type  | Mandatory  | Description   |
+  | ----------- | ------ | ---- | ----- |
+  | subscribeId | number | Yes   | Subscription ID.|
+
+- Example
+  ```js
+  // The subscribeId input must be the same as that automatically generated in startDeviceDiscovery.
+  dmInstance.stopDeviceDiscovery(subscribeId);
+  ```
+
+### authenticateDevice
+
+authenticateDevice(deviceInfo: DeviceInfo, authParam: AuthParam, callback: AsyncCallback<{deviceId: string, pinToken ?: number}>): void
+
+Authenticates a device.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name        | Type                                    | Mandatory  | Description     |
+  | ---------- | ---------------------------------------- | ---- | ------- |
+  | deviceInfo | [DeviceInfo](#deviceinfo)                | Yes   | Device information.  |
+  | authParam  | [AuthParam](#authparam)                  | Yes   | Authentication parameter.  |
+  | callback   | AsyncCallback<{ deviceId: string, pinToken ?: number }> | Yes   | Callback used to return the authentication result.|
+
+- Example
+  ```js
+  // Information about the device to authenticate. The information can be obtained from the device discovery result.
+  var deviceInfo ={
+      "deviceId": "XXXXXXXX",
+      "deviceName": "",
+      deviceType: 0x0E
+  };
+  let authParam = {
+      "authType": 1, // Authentication type. The value 1 means no account PIN authentication.
+      "extraInfo": {} 
+  }
+  dmInstance.authenticateDevice(deviceInfo, authParam, (err, data) => {
+      if (err) {
+          console.info(TAG + "authenticateDevice err:" + JSON.stringify(err));
+          return;
+      }
+      console.info(TAG + "authenticateDevice result:" + JSON.stringify(data));
+      token = data.pinToken;
+  });
+  ```
+
+### unAuthenticateDevice<sup>8+</sup>
+
+unAuthenticateDevice(deviceInfo: DeviceInfo): void
+
+Deauthenticates a device.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name        | Type                     | Mandatory  | Description   |
+  | ---------- | ------------------------- | ---- | ----- |
+  | deviceInfo | [DeviceInfo](#deviceinfo) | Yes   | Device information.|
+
+- Example
+  ```js
+  dmInstance.unAuthenticateDevice(deviceInfo);
+  ```
+
+
+### verifyAuthInfo
+
+verifyAuthInfo(authInfo: AuthInfo, callback: AsyncCallback<{deviceId: string, level: number}>): void
+
+Verifies authentication information.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description     |
+  | -------- | ---------------------------------------- | ---- | ------- |
+  | authInfo | [AuthInfo](#authinfo)                    | Yes   | Authentication information.  |
+  | authInfo | AsyncCallback<{ deviceId: string, level: number }> | Yes   | Callback used to return the verification result.|
+
+- Example
+  ```js
+  let authInfo = {
+    "authType": 1,
+    "token": xxxxxx,
+    "extraInfo": {}
+  }
+  dmInstance.verifyAuthInfo(authInfo, (err, data) => {
+    if (err) {
+        console.info(TAG + "verifyAuthInfo err:" + JSON.stringify(err));
+        return;
+    }
+    console.info(TAG + "verifyAuthInfo result:" + JSON.stringify(data));
+  });
+  ```
+
+
 ### on('deviceStateChange')
 
 on(type: 'deviceStateChange',  callback: Callback&lt;{ action: DeviceStateChangeAction, device: DeviceInfo }&gt;): void
@@ -130,13 +474,13 @@ Subscribes to changes in the device state.
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | type | string | Yes| Event type. The value is **deviceStateChange**, which indicates a device state change event.|
-  | callback | Callback&lt;{&nbsp;action:&nbsp;[DeviceStateChangeAction](#devicestatechangeaction),&nbsp;device:&nbsp;[DeviceInfo](#deviceinfo)&nbsp;}&gt; | Yes| Callback invoked to return the device information and state.|
+  | Name      | Type                                    | Mandatory  | Description                            |
+  | -------- | ---------------------------------------- | ---- | ------------------------------ |
+  | type     | string                                   | Yes   | Event type. The value **'deviceStateChange'** indicates a device state change event.|
+  | callback | Callback&lt;{ action: [DeviceStateChangeAction](#devicestatechangeaction), device: [DeviceInfo](#deviceinfo) }&gt; | Yes   | Callback invoked to return the device information and state.     |
 
 - Example
-  ```
+  ```js
   dmInstance.on('deviceStateChange', (data) => {      
         console.info("deviceStateChange on:" + JSON.stringify(data));
       }
@@ -146,20 +490,20 @@ Subscribes to changes in the device state.
 
 ### off('deviceStateChange')
 
-off(type: 'deviceStateChange', callback?: Call	back&lt;{ action: DeviceStateChangeAction, device: DeviceInfo }&gt;): void
+off(type: 'deviceStateChange', callback?: Callback&lt;{ action: DeviceStateChangeAction, device: DeviceInfo }&gt;): void
 
 Unsubscribes from changes in the device state.
 
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | type | string | Yes| Event type. The value **deviceStateChange** indicates an event of device state change.|
-  | callback | Callback&lt;{&nbsp;action:&nbsp;[DeviceStateChangeAction](#devicestatechangeaction),&nbsp;device:&nbsp;[DeviceInfo](#deviceinfo)&nbsp;&nbsp;}&gt; | Yes| Callback invoked to return the device information and state.|
+  | Name      | Type                                    | Mandatory  | Description                         |
+  | -------- | ---------------------------------------- | ---- | --------------------------- |
+  | type     | string                                   | Yes   | Event type. The value **'deviceStateChange'** indicates a device state change event.       |
+  | callback | Callback&lt;{ action: [DeviceStateChangeAction](#devicestatechangeaction), device: [DeviceInfo](#deviceinfo) }&gt; | Yes   | Callback invoked to return the device information and state.|
 
 - Example
-  ```
+  ```js
   dmInstance.off('deviceStateChange', (data) => {      
         console.info('deviceStateChange' + JSON.stringify(data));
      }
@@ -167,6 +511,95 @@ Unsubscribes from changes in the device state.
   ```
 
 
+### on('deviceFound')
+
+on(type: 'deviceFound', callback: Callback&lt;{ subscribeId: number, device: DeviceInfo }&gt;): void
+
+Subscribes to device discovery events.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description                        |
+  | -------- | ---------------------------------------- | ---- | -------------------------- |
+  | type     | string                                   | Yes   | Event type. The value **'deviceFound'** indicates an event reported when a device is discovered.|
+  | callback | Callback&lt;{ subscribeId: number, device: DeviceInfo }&gt; | Yes   | Callback used for device discovery.              |
+
+- Example
+  ```js
+  dmInstance.on('deviceFound', (data) => {
+        console.info("deviceFound:" + JSON.stringify(data));
+      }
+  );
+  ```
+
+### off('deviceFound')
+
+off(type: 'deviceFound', callback?: Callback&lt;{ subscribeId: number, device: DeviceInfo }&gt;): void
+
+Unsubscribes from device discovery events.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description                         |
+  | -------- | ---------------------------------------- | ---- | --------------------------- |
+  | type     | string                                   | Yes   | Event type. The value **'deviceFound'** indicates an event reported when a device is discovered.                |
+  | callback | Callback&lt;{ subscribeId: number, device: [DeviceInfo](#deviceinfo) }&gt; | Yes   | Callback used for device discovery, which is invoked to return the device information and state.|
+
+- Example
+  ```js
+  dmInstance.off('deviceFound', (data) => {      
+        console.info('deviceFound' + JSON.stringify(data));
+      }
+  );
+  ```
+
+### on('discoverFail')
+
+on(type: 'discoverFail', callback: Callback&lt;{ subscribeId: number, reason: number }&gt;): void
+
+Subscribes to device discovery failures.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description                            |
+  | -------- | ---------------------------------------- | ---- | ------------------------------ |
+  | type     | string                                   | Yes   | Event type. The event **'discoverFail'** indicates an event reported when device discovery fails.|
+  | callback | Callback&lt;{ subscribeId: number, reason: number }&gt; | Yes   | Callback used for the device discovery failure.                |
+
+- Example
+  ```js
+  dmInstance.on('discoverFail', (data) => {
+        this.log("discoverFail on:" + JSON.stringify(data));
+      }
+  );
+  ```
+
+### off('discoverFail')
+
+off(type: 'discoverFail', callback?: Callback&lt;{ subscribeId: number, reason: number }&gt;): void
+
+Unsubscribes from device discovery failures.
+
+**System capability**: SystemCapability.DistributedHardware.DeviceManager
+
+- **Parameters**
+  | Name      | Type                                    | Mandatory  | Description               |
+  | -------- | ---------------------------------------- | ---- | ----------------- |
+  | type     | string                                   | Yes   | Event type. The event **'discoverFail'** indicates an event reported when device discovery fails.    |
+  | callback | Callback&lt;{ subscribeId: number, reason: number }&gt; | Yes   | Callback used for the device discovery failure.|
+
+- Example
+  ```js
+  dmInstance.off('deviceFound', (data) => {      
+        console.info('deviceFound' + JSON.stringify(data));
+      }
+  );
+  ```
+
+
 ### on('serviceDie')
 
 on(type: 'serviceDie', callback: () =&gt; void): void
@@ -176,13 +609,13 @@ Subscribes to dead events of the **DeviceManager** service.
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | type | string | Yes| Event type. The value **serviceDie** indicates an event reported when the **DeviceManager** service is terminated unexpectedly.|
-  | callback | ()&nbsp;=&gt;&nbsp;void | Yes| Callback invoked when a dead event of the **DeviceManager** service occurs.|
+  | Name      | Type                   | Mandatory  | Description                                      |
+  | -------- | ----------------------- | ---- | ---------------------------------------- |
+  | type     | string                  | Yes   | Event type. The value **'serviceDie'** indicates an event reported when the **DeviceManager** service is terminated unexpectedly.|
+  | callback | () =&gt; void | Yes   | Callback invoked when a dead event of the **DeviceManager** service occurs.                      |
 
 - Example
-  ```
+  ```js
   dmInstance.on("serviceDie", () => {      
         console.info("serviceDie on");
      }
@@ -199,13 +632,13 @@ Unsubscribes from dead events of the **DeviceManager** service.
 **System capability**: SystemCapability.DistributedHardware.DeviceManager
 
 - **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | type | string | Yes| Event type. The value **serviceDie** indicates an event reported when the **DeviceManager** service is terminated unexpectedly.|
-  | callback | ()&nbsp;=&gt;&nbsp;void | No| Callback used to return the dead event of the **DeviceManager** service.|
+  | Name      | Type                   | Mandatory  | Description                                      |
+  | -------- | ----------------------- | ---- | ---------------------------------------- |
+  | type     | string                  | Yes   | Event type. The value **'serviceDie'** indicates an event reported when the **DeviceManager** service is terminated unexpectedly.|
+  | callback | () =&gt; void | No   | Callback used to return the dead event of the **DeviceManager** service.                    |
 
 - Example
-  ```
+  ```js
   dmInstance.off("serviceDie", () => {      
         console.info("serviceDie off");
     }