!2379 Done! 2099 DFX syscap改造

Merge pull request !2379 from wusongqing/TR2099

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

@@ -3,6 +3,7 @@
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **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.
 
+A Worker thread is an independent thread running in parallel with the main thread. The thread that creates the Worker thread is referred to as a host thread. The URL file passed in during Worker creation is executed in the Worker thread. The Worker thread can process time-consuming operations, but cannot directly operate the UI.
 
 ## Modules to Import
 
@@ -10,30 +11,31 @@
 import worker from '@ohos.worker';
 ```
 
-## System Capabilities
-
-SystemCapability.Utils.Lang
 
 ## Attributes
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| parentPort | [DedicatedWorkerGlobalScope](#dedicatedworkerglobalscope) | Yes| Yes| Object of the worker thread used to communicate with the host thread.|
+**System capability**: SystemCapability.Utils.Lang
+
+| Name      | Type                                                 | Readable| Writable| Description                                |
+| ---------- | --------------------------------------------------------- | ---- | ---- | ------------------------------------ |
+| parentPort | [DedicatedWorkerGlobalScope](#dedicatedworkerglobalscope) | Yes  | Yes  | Object of the Worker thread used to communicate with the host thread.|
 
 
 ## WorkerOptions
 
-Provides options that can be set for the worker to create.
+Provides options that can be set for the **Worker** instance to create.
+
+**System capability**: SystemCapability.Utils.Lang
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| type | "classic" | Yes| Yes| Mode in which the worker executes the script.|
-| name | string | Yes| Yes| Name of the worker.|
+| Name| Type | Readable| Writable| Description                  |
+| ---- | --------- | ---- | ---- | ---------------------- |
+| type | "classic" | Yes  | Yes  | Mode in which the Worker thread executes the script.|
+| name | string    | Yes  | Yes  | Name of the Worker thread.        |
 
 
 ## Worker
 
-Before using the following methods, you must construct a worker instance. The **Worker** class inherits from [EventTarget](#eventtarget).
+Before using the following APIs, you must construct a **Worker** instance. The **Worker** class inherits from [EventTarget](#eventtarget).
 
 
 ### constructor
@@ -42,18 +44,20 @@ constructor(scriptURL: string, options?: WorkerOptions)
 
 A constructor used to create a **Worker** instance.
 
+**System capability**: SystemCapability.Utils.Lang
+
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| scriptURL | string | Yes| URL of the script to be executed by the worker. The script is stored in the **workers** directory, which is in the same directory as the **pages** directory of the new DevEco Studio project. If the **workers** directory does not exist, you need to create it.|
-| options | [WorkerOptions](#workeroptions) | No| Options that can be set for the worker.|
+| Name   | Type                           | Mandatory| Description                                                        |
+| --------- | ------------------------------- | ---- | ------------------------------------------------------------ |
+| scriptURL | string                          | Yes  | URL of the script to be executed by the Worker thread. The script is stored in the **workers** directory, which is in the same directory as the **pages** directory of the new DevEco Studio project. If the **workers** directory does not exist, you need to create it.|
+| options   | [WorkerOptions](#workeroptions) | No  | Options that can be set for the **Worker** instance.                                          |
 
 **Return value**
 
-| Type| Description|
-| -------- | -------- |
-| worker | Returns the **Worker** instance created; returns **undefined** if the **Worker** instance fails to be created.|
+| Type  | Description                                                     |
+| ------ | --------------------------------------------------------- |
+| Worker | Returns the **Worker** instance created; returns **undefined** if the **Worker** instance fails to be created.|
 
 **Example**
 
@@ -66,14 +70,16 @@ const workerInstance = new worker.Worker("workers/worker.js", {name:"first worke
 
 postMessage(message: Object, options?: PostMessageOptions): void
 
-Sends a message to the worker thread. The data is transferred using the structured clone algorithm.
+Sends a message to the Worker thread. The data is transferred using the structured clone algorithm.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| message | Object | Yes| Data to be sent to the worker.|
-| options | [PostMessageOptions](#postmessageoptions) | No| **ArrayBuffer** instances that can be transferred. The **transferList** array cannot contain **null**.|
+| Name | Type                                     | Mandatory| Description                                                        |
+| ------- | ----------------------------------------- | ---- | ------------------------------------------------------------ |
+| message | Object                                    | Yes  | Data to be sent to the Worker thread.                                        |
+| options | [PostMessageOptions](#postmessageoptions) | No  | **ArrayBuffer** instances that can be transferred. The **transferList** array cannot contain **null**.|
 
 **Example**
 
@@ -81,6 +87,7 @@ Sends a message to the worker thread. The data is transferred using the structur
 const workerInstance = new worker.Worker("workers/worker.js");
 workerInstance.postMessage("hello world");
 ```
+
 ```
 const workerInstance= new worker.Worker("workers/worker.js");
 var buffer = new ArrayBuffer(8);
@@ -92,14 +99,16 @@ workerInstance.postMessage(buffer, [buffer]);
 
 on(type: string, listener: EventListener): void
 
-Adds an event listener to the worker.
+Adds an event listener for the Worker instance.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| type | string | Yes| Type of the event to listen for.|
-| listener | [EventListener](#eventlistener) | Yes| Callback to invoke when an event of the specified type occurs.|
+| Name  | Type                           | Mandatory| Description            |
+| -------- | ------------------------------- | ---- | ---------------- |
+| type     | string                          | Yes  | Type of the event to listen for.|
+| listener | [EventListener](#eventlistener) | Yes  | Callback to invoke when an event of the specified type occurs.    |
 
 **Example**
 
@@ -115,14 +124,16 @@ workerInstance.on("alert", (e)=>{
 
 once(type: string, listener: EventListener): void
 
-Adds an event listener to the worker and removes the event listener automatically after it is invoked once.
+Adds an event listener for the Worker thread and removes the event listener after it is invoked once.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| type | string | Yes| Type of the event to listen for.|
-| listener | [EventListener](#eventlistener) | Yes| Callback to invoke when an event of the specified type occurs.|
+| Name  | Type                           | Mandatory| Description            |
+| -------- | ------------------------------- | ---- | ---------------- |
+| type     | string                          | Yes  | Type of the event to listen for.|
+| listener | [EventListener](#eventlistener) | Yes  | Callback to invoke when an event of the specified type occurs.    |
 
 **Example**
 
@@ -138,14 +149,16 @@ workerInstance.once("alert", (e)=>{
 
 off(type: string, listener?: EventListener): void
 
-Removes an event listener for the worker.
+Removes an event listener for the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| type | string | Yes| Type of the event for which the event listener is removed.|
-| listener | [EventListener](#eventlistener) | No| Callback of the event listener to remove.|
+| Name  | Type                           | Mandatory| Description                  |
+| -------- | ------------------------------- | ---- | ---------------------- |
+| type     | string                          | Yes  | Type of the event for which the event listener is removed.  |
+| listener | [EventListener](#eventlistener) | No  | Callback of the event listener to remove.|
 
 **Example**
 
@@ -159,7 +172,9 @@ workerInstance.off("alert");
 
 terminate(): void
 
-Terminates the worker thread to stop the worker from receiving messages.
+Terminates the Worker thread to stop it from receiving messages.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Example**
 
@@ -173,13 +188,15 @@ workerInstance.terminate()
 
 onexit?: (code: number) => void
 
-Defines the event handler to be called when the worker exits. The handler is executed in the host thread.
+Defines the event handler to be called when the Worker thread exits. The handler is executed in the host thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| code | number | No| Code indicating the worker exit state.|
+| Name| Type  | Mandatory| Description              |
+| ------ | ------ | ---- | ------------------ |
+| code   | number | No  | Code indicating the Worker thread exit state.|
 
 **Example**
 
@@ -195,13 +212,15 @@ workerInstance.onexit = function(e) {
 
 onerror?: (err: ErrorEvent) => void
 
-Defines the event handler to be called when an exception occurs during worker execution. The event handler is executed in the host thread.
+Defines the event handler to be called when an exception occurs during Worker execution. The event handler is executed in the host thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| err | [ErrorEvent](#errorevent) | No| Error data.|
+| Name| Type                     | Mandatory| Description      |
+| ------ | ------------------------- | ---- | ---------- |
+| err    | [ErrorEvent](#errorevent) | No  | Error data.|
 
 **Example**
 
@@ -217,13 +236,15 @@ workerInstance.onerror = function(e) {
 
 onmessage?: (event: MessageEvent) => void
 
-Defines the event handler to be called when the host thread receives a message created by itself and sent by the worker through the **parentPort.postMessage**. The event handler is executed in the host thread.
+Defines the event handler to be called when the host thread receives a message created by itself and sent by the Worker thread through the **parentPort.postMessage**. The event handler is executed in the host thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| event | [MessageEvent](#messageevent) | No| Message received.|
+| Name| Type                         | Mandatory| Description                  |
+| ------ | ----------------------------- | ---- | ---------------------- |
+| event  | [MessageEvent](#messageevent) | No  | Message received.|
 
 **Example**
 
@@ -239,13 +260,15 @@ workerInstance.onmessage = function(e) {
 
 onmessageerror?: (event: MessageEvent) => void
 
-Defines the event handler to be called when the worker receives a message that cannot be serialized. The event handler is executed in the host thread.
+Defines the event handler to be called when the Worker thread receives a message that cannot be serialized. The event handler is executed in the host thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| event | [MessageEvent](#messageevent) | No| Error data.|
+| Name| Type                         | Mandatory| Description      |
+| ------ | ----------------------------- | ---- | ---------- |
+| event  | [MessageEvent](#messageevent) | No  | Error data.|
 
 **Example**
 
@@ -264,14 +287,16 @@ workerInstance.onmessageerror= function(e) {
 
 addEventListener(type: string, listener: EventListener): void
 
-Adds an event listener to the worker.
+Adds an event listener for the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| type | string | Yes| Type of the event to listen for.|
-| listener | [EventListener](#eventlistener) | Yes| Callback to invoke when an event of the specified type occurs.|
+| Name  | Type                           | Mandatory| Description            |
+| -------- | ------------------------------- | ---- | ---------------- |
+| type     | string                          | Yes  | Type of the event to listen for.|
+| listener | [EventListener](#eventlistener) | Yes  | Callback to invoke when an event of the specified type occurs.    |
 
 **Example**
 
@@ -287,14 +312,16 @@ workerInstance.addEventListener("alert", (e)=>{
 
 removeEventListener(type: string, callback?: EventListener): void
 
-Removes an event listener for the worker.
+Removes an event listener for the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| type | string | Yes| Type of the event for which the event listener is removed.|
-| callback | [EventListener](#eventlistener) | No| Callback of the event listener to remove.|
+| Name  | Type                           | Mandatory| Description                  |
+| -------- | ------------------------------- | ---- | ---------------------- |
+| type     | string                          | Yes  | Type of the event for which the event listener is removed.  |
+| callback | [EventListener](#eventlistener) | No  | Callback of the event listener to remove.|
 
 **Example**
 
@@ -308,18 +335,20 @@ workerInstance.removeEventListener("alert")
 
 dispatchEvent(event: Event): boolean
 
-Dispatches the event defined for the worker.
+Dispatches the event defined for the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| event | [Event](#event) | Yes| Event to dispatch.|
+| Name| Type           | Mandatory| Description            |
+| ------ | --------------- | ---- | ---------------- |
+| event  | [Event](#event) | Yes  | Event to dispatch.|
 
 **Return value**
 
-| Type| Description|
-| -------- | -------- |
+| Type   | Description                           |
+| ------- | ------------------------------- |
 | boolean | Returns **true** if the event is dispatched successfully; returns **false** otherwise.|
 
 **Example**
@@ -334,7 +363,9 @@ workerInstance.dispatchEvent({type:"alert"})
 
 removeAllListener(): void
 
-Removes all event listeners for the worker.
+Removes all event listeners for the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Example**
 
@@ -346,21 +377,23 @@ workerInstance.removeAllListener({type:"alert"})
 
 ## DedicatedWorkerGlobalScope
 
-Implements communication between the worker thread and the host thread. The **postMessage** API is used to send messages to the host thread, and the **close** API is used to terminate the worker thread. The **DedicatedWorkerGlobalScope** class inherits from [WorkerGlobalScope](#workerglobalscope).
+Implements communication between the Worker thread and the host thread. The **postMessage** API is used to send messages to the host thread, and the **close** API is used to terminate the Worker thread. The **DedicatedWorkerGlobalScope** class inherits from [WorkerGlobalScope](#workerglobalscope).
 
 
 ### postMessage
 
 postMessage(message: Object, options?: PostMessageOptions): void
 
-Sends a message to the host thread from the worker.
+Sends a message to the host thread from the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| message | Object | Yes| Data to be sent to the worker.|
-| options | [PostMessageOptions](#postmessageoptions) | No| **ArrayBuffer** instances that can be transferred. The **transferList** array cannot contain **null**.|
+| Name | Type                                     | Mandatory| Description                                                        |
+| ------- | ----------------------------------------- | ---- | ------------------------------------------------------------ |
+| message | Object                                    | Yes  | Data to be sent to the Worker thread.                                        |
+| options | [PostMessageOptions](#postmessageoptions) | No  | **ArrayBuffer** instances that can be transferred. The **transferList** array cannot contain **null**.|
 
 **Example**
 
@@ -373,6 +406,7 @@ workerInstance.onmessage = function(e) {
     console.log("receive data from worker.js")
 }
 ```
+
 ```
 // worker.js
 import worker from '@ohos.worker';
@@ -387,7 +421,9 @@ parentPort.onmessage = function(e){
 
 close(): void
 
-Closes the worker thread to stop the worker from receiving messages.
+Terminates the Worker thread to stop it from receiving messages.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Example**
 
@@ -396,6 +432,7 @@ Closes the worker thread to stop the worker from receiving messages.
 import worker from '@ohos.worker';
 const workerInstance = new worker.Worker("workers/worker.js")
 ```
+
 ```
 // worker.js
 import worker from '@ohos.worker';
@@ -410,13 +447,15 @@ parentPort.onmessage = function(e) {
 
 onmessage?: (event: MessageEvent) => void
 
-Defines the event handler to be called when the worker thread receives a message sent by the host thread through **worker.postMessage**. The event handler is executed in the worker thread.
+Defines the event handler to be called when the Worker thread receives a message sent by the host thread through **worker.postMessage**. The event handler is executed in the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| event | [MessageEvent](#messageevent) | No| Message received.|
+| Name| Type                         | Mandatory| Description                  |
+| ------ | ----------------------------- | ---- | ---------------------- |
+| event  | [MessageEvent](#messageevent) | No  | Message received.|
 
 **Example**
 
@@ -426,6 +465,7 @@ import worker from '@ohos.worker';
 const workerInstance = new worker.Worker("workers/worker.js")
 workerInstance.postMessage("hello world")
 ```
+
 ```
 // worker.js
 import worker from '@ohos.worker';
@@ -440,13 +480,15 @@ parentPort.onmessage = function(e) {
 
 onmessageerror?: (event: MessageEvent) => void
 
-Defines the event handler to be called when the worker receives a message that cannot be deserialized. The event handler is executed in the worker thread.
+Defines the event handler to be called when the Worker thread receives a message that cannot be deserialized. The event handler is executed in the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| event | [MessageEvent](#messageevent) | No| Error data.|
+| Name| Type                         | Mandatory| Description      |
+| ------ | ----------------------------- | ---- | ---------- |
+| event  | [MessageEvent](#messageevent) | No  | Error data.|
 
 **Example**
 
@@ -455,6 +497,7 @@ Defines the event handler to be called when the worker receives a message that c
 import worker from '@ohos.worker';
 const workerInstance = new worker.Worker("workers/worker.js")
 ```
+
 ```
 // worker.js
 import worker from '@ohos.worker';
@@ -469,19 +512,23 @@ parentPort.onmessageerror= function(e) {
 
 Specifies the object whose ownership needs to be transferred during data transfer. The object must be **ArrayBuffer**.
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| transfer | Object[] | Yes| Yes| **ArrayBuffer** array used to transfer the ownership.|
+**System capability**: SystemCapability.Utils.Lang
+
+| Name    | Type| Readable| Writable| Description                             |
+| -------- | -------- | ---- | ---- | --------------------------------- |
+| transfer | Object[] | Yes  | Yes  | **ArrayBuffer** array used to transfer the ownership.|
 
 
 ## Event
 
 Defines the event.
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| type | string | Yes| No| Type of the event.|
-| timeStamp | number | Yes| No| Timestamp (accurate to millisecond) when the event is created.|
+**System capability**: SystemCapability.Utils.Lang
+
+| Name     | Type| Readable| Writable| Description                              |
+| --------- | -------- | ---- | ---- | ---------------------------------- |
+| type      | string   | Yes  | No  | Type of the event.                  |
+| timeStamp | number   | Yes  | No  | Timestamp (accurate to millisecond) when the event is created.|
 
 
 ## EventListener
@@ -493,16 +540,18 @@ Implements event listening.
 
 Specifies the callback to invoke.
 
+**System capability**: SystemCapability.Utils.Lang
+
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| evt | [Event](#event) | Yes| Event class for the callback to invoke.|
+| Name| Type           | Mandatory| Description          |
+| ------ | --------------- | ---- | -------------- |
+| evt    | [Event](#event) | Yes  | Event class for the callback to invoke.|
 
 **Return value**
 
-| Type| Description|
-| -------- | -------- |
+| Type                                 | Description                           |
+| ------------------------------------- | ------------------------------- |
 | void \| Promise<void> | Returns no value or returns a **Promise**.|
 
 **Example**
@@ -517,57 +566,66 @@ workerInstance.addEventListener("alert", (e)=>{
 
 ## ErrorEvent
 
-Provides detailed information about the exception occurred during worker execution. The **ErrorEvent** class inherits from [Event](#event).
+Provides detailed information about the exception occurred during Worker execution. The **ErrorEvent** class inherits from [Event](#event).
+
+**System capability**: SystemCapability.Utils.Lang
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| message | string | Yes| No| Information about the exception.|
-| filename | string | Yes| No| File where the exception is located.|
-| lineno | number | Yes| No| Number of the line where the exception is located.|
-| colno | number | Yes| No| Number of the column where the exception is located.|
-| error | Object | Yes| No| Type of the exception.|
+| Name    | Type| Readable| Writable| Description                |
+| -------- | -------- | ---- | ---- | -------------------- |
+| message  | string   | Yes  | No  | Information about the exception.|
+| filename | string   | Yes  | No  | File where the exception is located.|
+| lineno   | number   | Yes  | No  | Number of the line where the exception is located.    |
+| colno    | number   | Yes  | No  | Number of the column where the exception is located.    |
+| error    | Object   | Yes  | No  | Type of the exception.          |
 
 
 ## MessageEvent
 
-Holds the data transferred between worker threads.
+Holds the data transferred between Worker threads.
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| data | T | Yes| No| Data transferred between threads.|
+**System capability**: SystemCapability.Utils.Lang
 
+| Name| Type| Readable| Writable| Description              |
+| ---- | -------- | ---- | ---- | ------------------ |
+| data | T        | Yes  | No  | Data transferred between threads.|
 
-## WorkerGlobalScope
 
-Defines the running environment of the worker thread. The **WorkerGlobalScope** class inherits from [EventTarget](#eventtarget).
+## WorkerGlobalScope
 
+Defines the running environment of the Worker thread. The **WorkerGlobalScope** class inherits from [EventTarget](#eventtarget).
 
 ### Attributes
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| name | string | Yes| No| Worker name specified when there is a new worker.|
-| self | [WorkerGlobalScope](#workerglobalscope) & typeof globalThis | Yes| No| WorkerGlobalScope.|
+**System capability**: SystemCapability.Utils.Lang
+
+| Name| Type                                                    | Readable| Writable| Description                                   |
+| ---- | ------------------------------------------------------------ | ---- | ---- | --------------------------------------- |
+| name | string                                                       | Yes  | No  | **Worker** instance specified when there is a new **Worker** instance.|
+| self | [WorkerGlobalScope](#workerglobalscope) & typeof globalThis | Yes  | No  | WorkerGlobalScope.                |
 
 
 ### onerror
 
 onerror?: (ev: ErrorEvent) => void
 
-Defines the event handler to be called when an exception occurs during worker execution. The event handler is executed in the worker thread.
+Defines the event handler to be called when an exception occurs during Worker execution. The event handler is executed in the Worker thread.
+
+**System capability**: SystemCapability.Utils.Lang
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| ev | [ErrorEvent](#errorevent) | No| Error data.|
+| Name| Type                     | Mandatory| Description      |
+| ------ | ------------------------- | ---- | ---------- |
+| ev     | [ErrorEvent](#errorevent) | No  | Error data.|
 
 **Example**
+
 ```
 // main.js
 import worker from '@ohos.worker';
 const workerInstance = new worker.Worker("workers/worker.js")
 ```
+
 ```
 // worker.js
 import worker from '@ohos.worker';