From 65f93581a93adf76626741958d6f3849db781f1c Mon Sep 17 00:00:00 2001
From: shawn_he <shawn.he@huawei.com>
Date: Mon, 16 May 2022 15:34:21 +0800
Subject: [PATCH] update docs

Signed-off-by: shawn_he <shawn.he@huawei.com>
---
 .../reference/apis/js-apis-call.md            |  38 ++---
 .../reference/apis/js-apis-contact.md         | 160 +++++++++---------
 .../reference/apis/js-apis-http.md            |  24 +--
 .../reference/apis/js-apis-net-connection.md  |  60 +++----
 .../reference/apis/js-apis-observer.md        |  38 ++---
 .../reference/apis/js-apis-radio.md           |  40 ++---
 .../reference/apis/js-apis-sim.md             |  40 ++---
 .../reference/apis/js-apis-sms.md             |  22 +--
 .../reference/apis/js-apis-socket.md          |  78 ++++-----
 .../reference/apis/js-apis-webSocket.md       |  38 ++---
 10 files changed, 269 insertions(+), 269 deletions(-)

diff --git a/en/application-dev/reference/apis/js-apis-call.md b/en/application-dev/reference/apis/js-apis-call.md
index 4d2b6c07f8..cda24e954d 100644
--- a/en/application-dev/reference/apis/js-apis-call.md
+++ b/en/application-dev/reference/apis/js-apis-call.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```
+```js
 import call from '@ohos.telephony.call';
 ```
 
@@ -30,7 +30,7 @@ Initiates a call. This API uses an asynchronous callback to return the execution
 
 **Example**
 
-```
+```js
 call.dial("138xxxxxxxx", (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -57,7 +57,7 @@ Initiates a call. You can set call options as needed. This API uses an asynchron
 
 **Example**
 
-```
+```js
 call.dial("138xxxxxxxx", {
     extras: false
 }, (err, data) => {
@@ -91,7 +91,7 @@ Initiates a call. You can set call options as needed. This API uses a promise to
 
 **Example**
 
-```
+```js
 let promise = call.dial("138xxxxxxxx", {
     extras: false
 });
@@ -121,7 +121,7 @@ This API is defined but not implemented in OpenHarmony 3.1 Release. It will be a
 
 **Example**
 
-```
+```js
 call.makeCall("138xxxxxxxx", err => { 
     console.log(`makeCall callback: err->${JSON.stringify(err)}`); 
 });
@@ -152,7 +152,7 @@ This API is defined but not implemented in OpenHarmony 3.1 Release. It will be a
 
 **Example**
 
-```
+```js
 let promise = call.makeCall("138xxxxxxxx"); 
 promise.then(() => { 
     console.log(`makeCall success`); 
@@ -177,7 +177,7 @@ Checks whether a call is in progress. This API uses an asynchronous callback to
 
 **Example**
 
-```
+```js
 call.hasCall((err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -200,7 +200,7 @@ Checks whether a call is in progress. This API uses a promise to return the resu
 
 **Example**
 
-```
+```js
 let promise = call.hasCall();
 promise.then(data => {
     console.log(`hasCall success, promise: data->${JSON.stringify(data)}`);
@@ -226,7 +226,7 @@ Obtains the call status. This API uses an asynchronous callback to return the re
 
 **Example**
 
-```
+```js
 call.getCallState((err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -249,7 +249,7 @@ Obtains the call status. This API uses a promise to return the result.
 
 **Example**
 
-```
+```js
 let promise = call.getCallState();
 promise.then(data => {
     console.log(`getCallState success, promise: data->${JSON.stringify(data)}`);
@@ -272,7 +272,7 @@ Checks whether a device supports voice calls. This API works in synchronous mode
 | ------- | ------------------------------------------------------------ |
 | boolean | - **true**: The device supports voice calls.<br>- **false**: The device does not support voice calls.|
 
-```
+```js
 let result = call.hasVoiceCapability(); 
 console.log(`hasVoiceCapability: ${JSON.stringify(result)}`);
 ```
@@ -294,7 +294,7 @@ Checks whether the call number of the SIM card in the specified slot is an emerg
 
 **Example**
 
-```
+```js
 call.isEmergencyPhoneNumber("138xxxxxxxx", (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -319,7 +319,7 @@ Checks whether the call number of the SIM card in the specified slot is an emerg
 
 **Example**
 
-```
+```js
 call.isEmergencyPhoneNumber("112", {slotId: 1}, (err, value) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -349,7 +349,7 @@ Checks whether the call number of the SIM card in the specified slot is an emerg
 
 **Example**
 
-```
+```js
 let promise = call.isEmergencyPhoneNumber("138xxxxxxxx", {slotId: 1});
 promise.then(data => {
     console.log(`isEmergencyPhoneNumber success, promise: data->${JSON.stringify(data)}`);
@@ -375,7 +375,7 @@ Formats a phone number based on the specified ISO country code. This API uses an
 
 **Example**
 
-```
+```js
 call.formatPhoneNumber("138xxxxxxxx", (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -400,7 +400,7 @@ Formats a phone number based on specified formatting options. This API uses an a
 
 **Example**
 
-```
+```js
 call.formatPhoneNumber("138xxxxxxxx",{
     countryCode: "CN"
 }, (err, data) => {
@@ -432,7 +432,7 @@ Formats a phone number based on specified formatting options. This API uses a pr
 
 **Example**
 
-```
+```js
 let promise = call.formatPhoneNumber("138xxxxxxxx", {
     countryCode: "CN"
 });
@@ -465,7 +465,7 @@ All country codes are supported.
 
 **Example**
 
-```
+```js
 call.formatPhoneNumberToE164("138xxxxxxxx",{
     countryCode: "CN"
 }, (err, data) => {
@@ -501,7 +501,7 @@ All country codes are supported.
 
 **Example**
 
-```
+```js
 let promise = call.formatPhoneNumberToE164("138xxxxxxxx", {
     countryCode: "CN"
 });
diff --git a/en/application-dev/reference/apis/js-apis-contact.md b/en/application-dev/reference/apis/js-apis-contact.md
index 9a4574e069..610f802066 100644
--- a/en/application-dev/reference/apis/js-apis-contact.md
+++ b/en/application-dev/reference/apis/js-apis-contact.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```
+```js
 import contact from '@ohos.contact';
 ```
 
@@ -29,7 +29,7 @@ Adds a contact. This API uses an asynchronous callback to return the result.
 
 **Example**
 
-  ```
+  ```js
   contact.addContact({
       fullName: {fullName: 'xxx'},
       phoneNumbers: [{phoneNumber: '138xxxxxxxx'}]
@@ -65,7 +65,7 @@ Adds a contact. This API uses a promise to return the result.
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.addContact({
       name: {fullName: 'xxx'},
       phoneNumbers: [{phoneNumber: '138xxxxxxxx'}]
@@ -96,7 +96,7 @@ Deletes a contact based on the specified contact key. This API uses an asynchron
 
 **Example**
 
-  ```
+  ```js
   contact.deleteContact('xxx', (err) => {
       if (err) {
           console.log(`deleteContact callback: err->${JSON.stringify(err)}`);
@@ -129,7 +129,7 @@ Deletes a contact based on the specified contact key. This API uses a promise to
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.deleteContact('xxx');
   promise.then(() => {
       console.log(`deleteContact success`);
@@ -157,7 +157,7 @@ Updates a contact based on the specified contact information. This API uses an a
 
 **Example**
 
-  ```
+  ```js
   contact.updateContact({
       name: {fullName: 'xxx'},
       phoneNumbers: [{phoneNumber: '138xxxxxxxx'}]
@@ -190,7 +190,7 @@ Updates a contact based on the specified contact information and attributes. Thi
 
 **Example**
 
-  ```
+  ```js
   contact.updateContact({
       fullName: {fullName: 'xxx'},
       phoneNumbers: [{phoneNumber: '138xxxxxxxx'}]
@@ -229,7 +229,7 @@ Updates a contact based on the specified contact information and attributes. Thi
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.updateContact({
       fullName: {fullName: 'xxx'},
       phoneNumbers: [{phoneNumber: '138xxxxxxxx'}]
@@ -262,7 +262,7 @@ Checks whether the ID of this contact is in the local address book. This API use
 
 **Example**
 
-  ```
+  ```js
   contact.isLocalContact(/*id*/1, (err, data) => {
       if (err) {
           console.log(`isLocalContact callback: err->${JSON.stringify(err)}`);
@@ -295,7 +295,7 @@ Checks whether the ID of this contact is in the local address book. This API use
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.isLocalContact(/*id*/1);
   promise.then((data) => {
       console.log(`isLocalContact success: data->${JSON.stringify(data)}`);
@@ -323,7 +323,7 @@ Checks whether a contact is included in my card. This API uses an asynchronous c
 
 **Example**
 
-  ```
+  ```js
   contact.isMyCard(/*id*/1, (err, data) => {
       if (err) {
           console.log(`isMyCard callback: err->${JSON.stringify(err)}`);
@@ -356,7 +356,7 @@ Checks whether a contact is included in my card. This API uses a promise to retu
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.isMyCard(/*id*/1);
   promise.then((data) => {
       console.log(`isMyCard success: data->${JSON.stringify(data)}`);
@@ -383,7 +383,7 @@ Queries my card. This API uses an asynchronous callback to return the result.
 
 **Example**
 
-  ```
+  ```js
   contact.queryMyCard((err, data) => {
       if (err) {
           console.log(`queryMyCard callback: err->${JSON.stringify(err)}`);
@@ -412,7 +412,7 @@ Queries my card based on the specified contact attributes. This API uses an asyn
 
 **Example**
 
-  ```
+  ```js
   contact.queryMyCard({
       attributes:['ATTR_EMAIL', 'ATTR_NAME']
   }, (err, data) => {
@@ -447,7 +447,7 @@ Queries my card based on the specified contact attributes. This API uses a promi
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryMyCard({
       attributes:['ATTR_EMAIL', 'ATTR_NAME']
   });
@@ -478,7 +478,7 @@ This API is defined but not implemented in OpenHarmony 3.1 Release. It will be a
 
 **Example**
 
-  ```
+  ```js
   contact.selectContact((err, data) => {
       if (err) {
           console.log(`selectContact callback: err->${JSON.stringify(err)}`);
@@ -508,7 +508,7 @@ This API is defined but not implemented in OpenHarmony 3.1 Release. It will be a
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.selectContact();
   promise.then((data) => {
       console.log(`selectContact success: data->${JSON.stringify(data)}`);
@@ -536,7 +536,7 @@ Queries a contact based on the specified key. This API uses an asynchronous call
 
 **Example**
 
-  ```
+  ```js
   contact.queryContact('xxx', (err, data) => {
       if (err) {
           console.log(`queryContact callback: err->${JSON.stringify(err)}`);
@@ -566,7 +566,7 @@ Queries contacts based on the specified key and application. This API uses an as
 
 **Example**
 
-  ```
+  ```js
   contact.queryContact('xxx', {
       holderId: 0
   }, (err, data) => {
@@ -598,7 +598,7 @@ Queries contacts based on the specified key and attributes. This API uses an asy
 
 **Example**
 
-  ```
+  ```js
   contact.queryContact('xxx', {
       attributes: ["ATTR_EMAIL", "ATTR_NAME"]
   }, (err, data) => {
@@ -631,7 +631,7 @@ Queries contacts based on the specified key, application, and attributes. This A
 
 **Example**
 
-  ```
+  ```js
   contact.queryContact('xxx', {
       holderId: 0
   }, {
@@ -670,7 +670,7 @@ Queries contacts based on the specified key, application, and attributes. This A
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryContact('xxx', {
       holderId: 0
   }, {
@@ -701,7 +701,7 @@ Queries all contacts. This API uses an asynchronous callback to return the resul
 
 **Example**
 
-  ```
+  ```js
   contact.queryContacts((err, data) => {
       if (err) {
           console.log(`queryContacts callback: err->${JSON.stringify(err)}`);
@@ -730,7 +730,7 @@ Queries all contacts based on the specified application. This API uses an asynch
 
 **Example**
 
-  ```
+  ```js
   contact.queryContacts({
       holderId: 0
   }, (err, data) => {
@@ -761,7 +761,7 @@ Queries all contacts based on the specified attributes. This API uses an asynchr
 
 **Example**
 
-  ```
+  ```js
   contact.queryContacts({
       attributes: ["ATTR_EMAIL", "ATTR_NAME"]
   }, (err, data) => {
@@ -793,7 +793,7 @@ Queries all contacts based on the specified application and attributes. This API
 
 **Example**
 
-  ```
+  ```js
   contact.queryContacts({
       holderId: 0
   }, {
@@ -831,7 +831,7 @@ Queries all contacts based on the specified application and attributes. This API
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryContacts({
       holderId: 0
   }, {
@@ -863,7 +863,7 @@ Queries contacts based on the specified phone number. This API uses an asynchron
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByPhoneNumber('138xxxxxxxx', (err, data) => {
       if (err) {
           console.log(`queryContactsByPhoneNumber callback: err->${JSON.stringify(err)}`);
@@ -893,7 +893,7 @@ Queries contacts based on the specified phone number and application. This API u
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByPhoneNumber('138xxxxxxxx', {
       holderId: 0
   }, (err, data) => {
@@ -925,7 +925,7 @@ Queries contacts based on the specified phone number and attributes. This API us
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByPhoneNumber('138xxxxxxxx', {
       attributes: ["ATTR_EMAIL", "ATTR_NAME"]
   }, (err, data) => {
@@ -958,7 +958,7 @@ Queries contacts based on the specified phone number, application, and attribute
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByPhoneNumber('138xxxxxxxx', {
       holderId: 0
   }, {
@@ -997,7 +997,7 @@ Queries contacts based on the specified phone number, application, and attribute
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryContactsByPhoneNumber('138xxxxxxxx', {
       holderId: 0
   }, {
@@ -1029,7 +1029,7 @@ Queries contacts based on the specified email address. This API uses an asynchro
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByEmail('xxx@email.com', (err, data) => {
       if (err) {
           console.log(`queryContactsByEmail callback: err->${JSON.stringify(err)}`);
@@ -1059,7 +1059,7 @@ Queries contacts based on the specified email address and application. This API
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByEmail('xxx@email.com', {
       holderId: 0
   }, (err, data) => {
@@ -1091,7 +1091,7 @@ Queries contacts based on the specified email address and attributes. This API u
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByEmail('xxx@email.com', {
       attributes: ["ATTR_EMAIL", "ATTR_NAME"]
   }, (err, data) => {
@@ -1124,7 +1124,7 @@ Queries contacts based on the specified email address, application, and attribut
 
 **Example**
 
-  ```
+  ```js
   contact.queryContactsByEmail('xxx@email.com', {
       holderId: 0
   }, {
@@ -1163,7 +1163,7 @@ Queries contacts based on the specified email address, application, and attribut
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryContactsByEmail('xxx@email.com', {
       holderId: 0
   }, {
@@ -1194,7 +1194,7 @@ Queries all groups of this contact. This API uses an asynchronous callback to re
 
 **Example**
 
-  ```
+  ```js
   contact.queryGroups((err, data) => {
       if (err) {
           console.log(`queryGroups callback: err->${JSON.stringify(err)}`);
@@ -1223,7 +1223,7 @@ Queries all groups of this contact based on the specified application. This API
 
 **Example**
 
-  ```
+  ```js
   contact.queryGroups({
       holderId: 0
   }, (err, data) => {
@@ -1258,7 +1258,7 @@ Queries all groups of this contact based on the specified application. This API
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryGroups({
       holderId: 0
   });
@@ -1287,7 +1287,7 @@ Queries all applications that have created contacts. This API uses an asynchrono
 
 **Example**
 
-  ```
+  ```js
   contact.queryHolders((err, data) => {
       if (err) {
           console.log(`queryHolders callback: err->${JSON.stringify(err)}`);
@@ -1315,7 +1315,7 @@ Queries all applications that have created contacts. This API uses a promise to
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryHolders();
   promise.then((data) => {
       console.log(`queryHolders success: data->${JSON.stringify(data)}`);
@@ -1343,7 +1343,7 @@ Queries the key of a contact based on the specified contact ID. This API uses an
 
 **Example**
 
-  ```
+  ```js
   contact.queryKey(/*id*/1, (err, data) => {
       if (err) {
           console.log(`queryKey callback: err->${JSON.stringify(err)}`);
@@ -1373,7 +1373,7 @@ Queries the key of a contact based on the specified contact ID and application.
 
 **Example**
 
-  ```
+  ```js
   contact.queryKey(id, {
       holderId:1
   }, (err, data) => {
@@ -1409,7 +1409,7 @@ Queries the key of a contact based on the specified contact ID and application.
 
 **Example**
 
-  ```
+  ```js
   let promise = contact.queryKey(id, {
       holderId: 0
   });
@@ -1462,7 +1462,7 @@ Defines a contact.
 Create contact data in JSON format:
 
 
-```
+```js
 let myContact = {
     phoneNumbers: [{
         phoneNumber: "138xxxxxxxx"
@@ -1480,7 +1480,7 @@ let myContact = {
 
   Or, create data by configuring a new Contact object.
 
-```
+```js
 let myContact = new contact.Contact();
 let name = new contact.Name();
 name.fullName = "fullName";
@@ -1508,7 +1508,7 @@ If **null** is passed, all attributes are queried by default.
 Create contact data in JSON format:
 
 
-```
+```js
 let contactAttributes = {
     attributes: [
         contact.Attribute.ATTR_EMAIL,
@@ -1521,7 +1521,7 @@ let contactAttributes = {
 Or, create data by configuring a **ContactAttributes** object.
 
 
-```
+```js
 let contactAttributes = new contact.ContactAttributes();
 contactAttributes.attributes = ["ATTR_EMAIL"];
 ```
@@ -1555,7 +1555,7 @@ Enumerates contact attributes.
 
 Create contact data in JSON format:
 
-```
+```js
 let attributes = [contact.Attribute.ATTR_EMAIL, contact.Attribute.ATTR_NAME, contact.Attribute.ATTR_PHONE];
 ```
 
@@ -1591,7 +1591,7 @@ Defines a contact's email.
 
   Create contact data in JSON format:
 
-```
+```js
 let email = {
     email: "xxx@email.com",
     displayName: "displayName"
@@ -1601,7 +1601,7 @@ let email = {
 
   Or, create data by configuring an **Email** object.
 
-```
+```js
 let email = new contact.Email();
 email.email = "xxx@email.com";
 ```
@@ -1624,7 +1624,7 @@ Defines an application that creates the contact.
 
   Create contact data in JSON format:
 
-```
+```js
 let holder = {
   holderId: 0
 };
@@ -1632,7 +1632,7 @@ let holder = {
 
   Or, create data by configuring a **Holder** object.
 
-```
+```js
 let holder = new contact.Holder();
 holder.holderId = 0;
 ```
@@ -1668,7 +1668,7 @@ Defines a contact's event.
 
   Create contact data in JSON format:
 
-```
+```js
 let event = {
     eventDate: "xxxxxx"
 };
@@ -1676,7 +1676,7 @@ let event = {
 
   Or, create data by configuring an **Event** object.
 
-```
+```js
 let event = new contact.Event();
 event.eventDate = "xxxxxx";
 ```
@@ -1698,7 +1698,7 @@ Defines a contact group.
 
   Create contact data in JSON format:
 
-```
+```js
 let group = {
     groupId: 1,
     title: "title"
@@ -1707,7 +1707,7 @@ let group = {
 
   Or, create data by configuring a **Group** object.
 
-```
+```js
 let group = new contact.Group();
 group.title = "title";
 ```
@@ -1747,7 +1747,7 @@ Enumerates IM addresses.
 
   Create contact data in JSON format:
 
-```
+```js
 let imAddress = {
     imAddress: "imAddress",
     labelName: "labelName"
@@ -1757,7 +1757,7 @@ let imAddress = {
 
   Or, create data by configuring an **ImAddress** object.
 
-```
+```js
 let imAddress = new contact.ImAddress();
 imAddress.imAddress = "imAddress";
 ```
@@ -1786,7 +1786,7 @@ Defines a contact's name.
 
   Create contact data in JSON format:
 
-```
+```js
 let name = {
     familyName: "familyName",
     fullName: "fullName"
@@ -1795,7 +1795,7 @@ let name = {
 
   Or, create data by configuring a **Name** object.
 
-```
+```js
 let name = new contact.Name();
 name.familyName = "familyName";
 name.fullName = "fullName";
@@ -1817,7 +1817,7 @@ Defines a contact's nickname.
 
   Create contact data in JSON format:
 
-```
+```js
 let nickName = {
     nickName: "nickName"
 };
@@ -1825,7 +1825,7 @@ let nickName = {
 
   Or, create data by configuring a **NickName** object.
 
-```
+```js
 let nickName = new contact.NickName();
 nickName.nickName = "nickName";
 ```
@@ -1846,7 +1846,7 @@ Defines a contact's note.
 
   Create contact data in JSON format:
 
-```
+```js
 let note = {
     noteContent: "noteContent"
 };
@@ -1854,7 +1854,7 @@ let note = {
 
   Or, create data by configuring a **Note** object.
 
-```
+```js
 let note = new contact.Note();
 note.noteContent = "noteContent";
 ```
@@ -1876,7 +1876,7 @@ Defines a contact's organization.
 
   Create contact data in JSON format:
 
-```
+```js
 let organization = {
     name: "name",
     title: "title"
@@ -1885,7 +1885,7 @@ let organization = {
 
   Or, create data by configuring an **Organization** object.
 
-```
+```js
 let organization = new contact.Organization();
 organization.name = "name";
 organization.title = "title";
@@ -1939,7 +1939,7 @@ Defines a contact's phone number.
 
   Create contact data in JSON format:
 
-```
+```js
 let phoneNumber = {
     phoneNumber: "138xxxxxxxx",
     labelId: contact.PhoneNumber.NUM_HOME
@@ -1948,7 +1948,7 @@ let phoneNumber = {
 
   Or, create data by configuring a new **PhoneNumber** object.
 
-```
+```js
 let phoneNumber = new contact.PhoneNumber();
 phoneNumber.phoneNumber = "138xxxxxxxx";
 ```
@@ -1969,7 +1969,7 @@ Defines a contact's portrait.
 
   Create contact data in JSON format:
 
-```
+```js
 let portrait = {
     uri: "uri"
 };
@@ -1977,7 +1977,7 @@ let portrait = {
 
   Or, create data by configuring a new **Portrait** object.
 
-```
+```js
 let portrait = new contact.Portrait();
 portrait.uri = "uri";
 ```
@@ -2020,7 +2020,7 @@ Defines a contact's postal address.
 
   Create contact data in JSON format:
 
-```
+```js
 let postalAddress = {
     city: "city"
 };
@@ -2028,7 +2028,7 @@ let postalAddress = {
 
   Or, create data by configuring a new **PostalAddress** object.
 
-```
+```js
 let postalAddress = new contact.PostalAddress();
 postalAddress.city = "city";
 ```
@@ -2075,7 +2075,7 @@ Defines a contact's relationship.
 
   Create contact data in JSON format:
 
-```
+```js
 let relation = {
     relationName: "relationName",
     labelId: contact.Relation.RELATION_ASSISTANT
@@ -2084,7 +2084,7 @@ let relation = {
 
   Or, create data by configuring a new **Relation** object.
 
-```
+```js
 let relation = new contact.Relation();
 relation.relationName = "relationName";
 relation.labelId = contact.Relation.RELATION_ASSISTANT;
@@ -2121,7 +2121,7 @@ Defines a contact's SIP address.
 
   Create contact data in JSON format:
 
-```
+```js
 var sipAddress = {
     sipAddress: "sipAddress"
 };
@@ -2129,7 +2129,7 @@ var sipAddress = {
 
   Or, create data by configuring a new **SipAddress** object.
 
-```
+```js
 let sipAddress = new contact.SipAddress();
 sipAddress.sipAddress = "sipAddress";
 ```
@@ -2150,7 +2150,7 @@ Defines a contact's website.
 
   Create contact data in JSON format:
 
-```
+```js
 let website = {
     website: "website"
 };
@@ -2158,7 +2158,7 @@ let website = {
 
   Or, create data by configuring a new **Website** object.
 
-```
+```js
 let website = new contact.Website();
 website.website = "website";
 ```
diff --git a/en/application-dev/reference/apis/js-apis-http.md b/en/application-dev/reference/apis/js-apis-http.md
index c4c8d11faf..f1ef654168 100644
--- a/en/application-dev/reference/apis/js-apis-http.md
+++ b/en/application-dev/reference/apis/js-apis-http.md
@@ -7,13 +7,13 @@
 
 ## Modules to Import
 
-```
+```js
 import http from '@ohos.net.http';
 ```
 
 ## Example
 
-```
+```js
 import http from '@ohos.net.http';
 
 // Each HttpRequest corresponds to an HttpRequestTask object and cannot be reused.
@@ -71,7 +71,7 @@ Creates an HTTP request. You can use this API to initiate or destroy an HTTP req
 
 **Example**
 
-```
+```js
 import http from '@ohos.net.http';
 let httpRequest = http.createHttp();
 ```
@@ -100,7 +100,7 @@ Initiates an HTTP request to a given URL. This API uses an asynchronous callback
 
 **Example**
 
-```
+```js
 httpRequest.request("EXAMPLE_URL", (err, data) => {
     if (!err) {
         console.info('Result:' + data.result);
@@ -133,7 +133,7 @@ Initiates an HTTP request containing specified options to a given URL. This API
 
 **Example**
 
-```
+```js
 httpRequest.request("EXAMPLE_URL",
 {
     method: http.RequestMethod.GET,
@@ -183,7 +183,7 @@ Initiates an HTTP request to a given URL. This API uses a promise to return the
 
 **Example**
 
-```
+```js
 let promise = httpRequest.request("EXAMPLE_URL", {
     method: http.RequestMethod.GET,
     connectTimeout: 60000,
@@ -214,7 +214,7 @@ Destroys an HTTP request.
 
 **Example**
 
-```
+```js
 httpRequest.destroy();
 ```
 
@@ -239,7 +239,7 @@ Registers an observer for HTTP Response Header events.
 
 **Example**
 
-```
+```js
 httpRequest.on('headerReceive', (err, data) => {
     if (!err) {
         console.info('header: ' + JSON.stringify(data));
@@ -273,7 +273,7 @@ Unregisters the observer for HTTP Response Header events.
 
 **Example**
 
-```
+```js
 httpRequest.off('headerReceive');
 ```
 
@@ -294,7 +294,7 @@ Registers an observer for HTTP Response Header events.
 
 **Example**
 
-```
+```js
 httpRequest.on('headersReceive', (header) => {
     console.info('header: ' + JSON.stringify(header));
 });
@@ -322,7 +322,7 @@ Unregisters the observer for HTTP Response Header events.
 
 **Example**
 
-```
+```js
 httpRequest.off('headersReceive');
 ```
 
@@ -343,7 +343,7 @@ Registers a one-time observer for HTTP Response Header events. Once triggered, t
 
 **Example**
 
-```
+```js
 httpRequest.once('headersReceive', (header) => {
     console.info('header: ' + JSON.stringify(header));
 });
diff --git a/en/application-dev/reference/apis/js-apis-net-connection.md b/en/application-dev/reference/apis/js-apis-net-connection.md
index bd4404ebc0..6e1eab82db 100644
--- a/en/application-dev/reference/apis/js-apis-net-connection.md
+++ b/en/application-dev/reference/apis/js-apis-net-connection.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```javascript
+```js
 import connection from '@ohos.net.connection'
 ```
 
@@ -29,7 +29,7 @@ Obtains the default active data network. This API uses an asynchronous callback
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet(function (error, netHandle) {
     console.log(JSON.stringify(error))
     console.log(JSON.stringify(netHandle))
@@ -54,7 +54,7 @@ Obtains the default active data network. This API uses a promise to return the r
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     console.log(JSON.stringify(netHandle))
 })
@@ -76,7 +76,7 @@ Checks whether the default data network is activated. This API uses an asynchron
 
 **Example**
 
-```javascript
+```js
 connection.hasDefaultNet(function (error, has) {
     console.log(JSON.stringify(error))
     console.log(has)
@@ -99,7 +99,7 @@ Checks whether the default data network is activated. This API uses a promise to
 
 **Example**
 
-```javascript
+```js
 connection.hasDefaultNet().then(function (has) {
     console.log(has)
 })
@@ -122,7 +122,7 @@ Obtains the list of all active data networks. This API uses an asynchronous call
 
 **Example**
 
-```
+```js
 connection.getAllNets(function (error, nets) {
     console.log(JSON.stringify(error))
     console.log(JSON.stringify(nets))
@@ -147,7 +147,7 @@ Obtains the list of all active data networks. This API uses a promise to return
 
 **Example**
 
-```
+```js
 connection.getAllNets().then(function (nets) {
     console.log(JSON.stringify(nets))
 });
@@ -172,7 +172,7 @@ Obtains connection properties of the network corresponding to given network hand
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.getConnectionProperties(netHandle, function (error, info) {
         console.log(JSON.stringify(error))
@@ -205,7 +205,7 @@ Obtains connection properties of the network corresponding to **netHandle**. Thi
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.getConnectionProperties(netHandle).then(function (info) {
         console.log(JSON.stringify(info))
@@ -232,7 +232,7 @@ Obtains capability information of the network corresponding to **netHandle**. Th
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.getNetCapabilities(netHandle, function (error, info) {
         console.log(JSON.stringify(error))
@@ -265,7 +265,7 @@ Obtains capability information of the network corresponding to **netHandle**. Th
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.getNetCapabilities(netHandle).then(function (info) {
         console.log(JSON.stringify(info))
@@ -291,7 +291,7 @@ Reports connection of the data network. This API uses an asynchronous callback t
 
 **Example**
 
-```
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.reportNetConnected(netHandle, function (error) {
         console.log(JSON.stringify(error))
@@ -322,7 +322,7 @@ Reports connection of the data network. This API uses a promise to return the re
 
 **Example**
 
-```
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.reportNetConnected(netHandle).then(function () {
         console.log(`report success`)
@@ -349,7 +349,7 @@ Reports disconnection of the data network. This API uses an asynchronous callbac
 
 **Example**
 
-```
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.reportNetDisconnected(netHandle, function (error) {
         console.log(JSON.stringify(error))
@@ -380,7 +380,7 @@ Reports disconnection of the data network. This API uses a promise to return the
 
 **Example**
 
-```
+```js
 connection.getDefaultNet().then(function (netHandle) {
     connection.reportNetDisconnected(netHandle).then(function () {
         console.log(`report success`)
@@ -407,7 +407,7 @@ Resolves the host name by using the default network to obtain all IP addresses.
 
 **Example**
 
-```
+```js
 let host = "xxxx";
 connection.getAddressesByName(host, function (error, addresses) {
     console.log(JSON.stringify(error))
@@ -439,7 +439,7 @@ Resolves the host name by using the default network to obtain all IP addresses.
 
 **Example**
 
-```
+```js
 let host = "xxxx";
 connection.getAddressesByName(host).then(function (addresses) {
     console.log(JSON.stringify(addresses))
@@ -469,7 +469,7 @@ Obtains the handle of the network specified by **netSpecifier**.
 
 **Example**
 
-```javascript
+```js
 // Default network
 let netConnection = connection.createNetConnection()
 
@@ -502,7 +502,7 @@ Registers a listener for **netAvailable** events.
 
 **Example**
 
-```javascript
+```js
 netConnection.on('netAvailable', function (data) {
     console.log(JSON.stringify(data))
 })
@@ -525,7 +525,7 @@ Registers a listener for **netCapabilitiesChange** events.
 
 **Example**
 
-```javascript
+```js
 netConnection.on('netCapabilitiesChange', function (data) {
     console.log(JSON.stringify(data))
 })
@@ -548,7 +548,7 @@ Registers a listener for **netConnectionPropertiesChange** events.
 
 **Example**
 
-```javascript
+```js
 netConnection.on('netConnectionPropertiesChange', function (data) {
     console.log(JSON.stringify(data))
 })
@@ -571,7 +571,7 @@ Registers a listener for **netBlockStatusChange** events.
 
 **Example**
 
-```javascript
+```js
 netConnection.on('netBlockStatusChange', function (data) {
     console.log(JSON.stringify(data))
 })
@@ -594,7 +594,7 @@ Registers a listener for **netLost** events.
 
 **Example**
 
-```javascript
+```js
 let netConnection1 = connection.createNetConnection()
 netConnection1.on('netLost', function (data) {
     console.log(JSON.stringify(data))
@@ -618,7 +618,7 @@ Registers a listener for **netUnavailable** events.
 
 **Example**
 
-```javascript
+```js
 netConnection.on('netUnavailable', function (data) {
     console.log(JSON.stringify(data))
 })
@@ -642,7 +642,7 @@ Registers a listener for network status changes.
 
 **Example**
 
-```javascript
+```js
 netConnection.register(function (error) {
     console.log(JSON.stringify(error))
 })
@@ -664,7 +664,7 @@ Unregisters the listener for network status changes.
 
 **Example**
 
-```javascript
+```js
 netConnection.unregister(function (error) {
     console.log(JSON.stringify(error))
 })
@@ -703,7 +703,7 @@ Resolves the host name by using the corresponding network to obtain all IP addre
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     let host = "xxxx";
     netHandle.getAddressesByName(host, function (error, addresses) {
@@ -737,7 +737,7 @@ Resolves the host name by using the corresponding network to obtain all IP addre
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     let host = "xxxx";
     netHandle.getAddressesByName(host).then(function (addresses) {
@@ -765,7 +765,7 @@ Resolves the host name by using the corresponding network to obtain the first IP
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     let host = "xxxx";
     netHandle.getAddressByName(host, function (error, address) {
@@ -799,7 +799,7 @@ Resolves the host name by using the corresponding network to obtain the first IP
 
 **Example**
 
-```javascript
+```js
 connection.getDefaultNet().then(function (netHandle) {
     let host = "xxxx";
     netHandle.getAddressByName(host).then(function (address) {
diff --git a/en/application-dev/reference/apis/js-apis-observer.md b/en/application-dev/reference/apis/js-apis-observer.md
index 29d9e85a23..b68d1dc35b 100644
--- a/en/application-dev/reference/apis/js-apis-observer.md
+++ b/en/application-dev/reference/apis/js-apis-observer.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```
+```js
 import observer from '@ohos.telephony.observer'
 ```
 
@@ -30,7 +30,7 @@ Registers an observer for network status change events. This API uses an asynchr
 
 **Example**
 
-```
+```js
 observer.on('networkStateChange', data =>{ 
     console.log("on networkStateChange, data:" + JSON.stringify(data));
 });
@@ -57,7 +57,7 @@ Registers an observer for network status change events of the SIM card in the sp
 
 **Example**
 
-```
+```js
 observer.on('networkStateChange', {slotId: 0}, data =>{ 
     console.log("on networkStateChange, data:" + JSON.stringify(data));
 });
@@ -87,7 +87,7 @@ Unregisters the observer for network status change events. This API uses an asyn
 
 **Example**
 
-```
+```js
 let callback = data => {
     console.log("on networkStateChange, data:" + JSON.stringify(data));
 }
@@ -114,7 +114,7 @@ Registers an observer for signal status change events. This API uses an asynchro
 
 **Example**
 
-```
+```js
 observer.on('signalInfoChange', data =>{ 
     console.log("on signalInfoChange, data:" + JSON.stringify(data));
 });
@@ -139,7 +139,7 @@ Registers an observer for signal status change events of the SIM card in the spe
 
 **Example**
 
-```
+```js
 observer.on('signalInfoChange', {slotId: 0}, data =>{ 
     console.log("on signalInfoChange, data:" + JSON.stringify(data));
 });
@@ -167,7 +167,7 @@ Unregisters the observer for signal status change events. This API uses an async
 
 **Example**
 
-```
+```js
 let callback = data => {
     console.log("on signalInfoChange, data:" + JSON.stringify(data));
 }
@@ -197,7 +197,7 @@ Registers an observer for call status change events. This API uses an asynchrono
 
 **Example**
 
-```
+```js
 observer.on('callStateChange', value =>{ 
     console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
 });
@@ -224,7 +224,7 @@ Registers an observer for call status change events. This API uses an asynchrono
 
 **Example**
 
-```
+```js
 observer.on('callStateChange', {slotId: 0}, value =>{ 
     console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
 });
@@ -254,7 +254,7 @@ Unregisters the observer for call status change events. This API uses an asynchr
 
 **Example**
 
-```
+```js
 let callback = value => {
     console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
 }
@@ -282,7 +282,7 @@ Registers an observer for connection status change events of the cellular data l
 
 **Example**
 
-```
+```js
 observer.on('cellularDataConnectionStateChange', value =>{
     console.log("on cellularDataConnectionStateChange, state:" + value.state + ", network:" + value.network);
 });
@@ -307,7 +307,7 @@ Registers an observer for connection status change events of the cellular data l
 
 **Example**
 
-```
+```js
 observer.on('cellularDataConnectionStateChange', {slotId: 0}, value =>{
     console.log("on cellularDataConnectionStateChange, state:" + value.state + ", network:" + value.network);
 });
@@ -335,7 +335,7 @@ Unregisters the observer for connection status change events of the cellular dat
 
 **Example**
 
-```
+```js
 let callback = value => {
     console.log("on cellularDataConnectionStateChange, state:" + value.state + ", network:" + value.network);
 }
@@ -363,7 +363,7 @@ Registers an observer for the uplink and downlink data flow status change events
 
 **Example**
 
-```
+```js
 observer.on('cellularDataFlowChange', data =>{
     console.log("on networkStateChange, data:" + JSON.stringify(data));
 });
@@ -388,7 +388,7 @@ Registers an observer for the uplink and downlink data flow status change events
 
 **Example**
 
-```
+```js
 observer.on('cellularDataFlowChange', {slotId: 0}, data =>{
     console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
 });
@@ -416,7 +416,7 @@ Unregisters the observer for the uplink and downlink data flow status change eve
 
 **Example**
 
-```
+```js
 let callback = data => {
     console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
 }
@@ -444,7 +444,7 @@ Registers an observer for SIM card status change events. This API uses an asynch
 
 **Example**
 
-```
+```js
 observer.on('simStateChange', data =>{
     console.log("on simStateChange, data:" + JSON.stringify(data));
 });
@@ -469,7 +469,7 @@ Registers an observer for status change events of the SIM card in the specified
 
 **Example**
 
-```
+```js
 observer.on('simStateChange', {slotId: 0}, data =>{
     console.log("on simStateChange, data:" + JSON.stringify(data));
 });
@@ -497,7 +497,7 @@ Unregisters the observer for SIM card status change events. This API uses an asy
 
 **Example**
 
-```
+```js
 let callback = data => {
     console.log("on simStateChange, data:" + JSON.stringify(data));
 }
diff --git a/en/application-dev/reference/apis/js-apis-radio.md b/en/application-dev/reference/apis/js-apis-radio.md
index 468091db60..4df1f4e33d 100644
--- a/en/application-dev/reference/apis/js-apis-radio.md
+++ b/en/application-dev/reference/apis/js-apis-radio.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```
+```js
 import radio from '@ohos.telephony.radio'
 ```
 
@@ -30,7 +30,7 @@ Obtains the radio access technology (RAT) used by the CS and PS domains. This AP
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.getRadioTech(slotId, (err, data) =>{ 
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -62,7 +62,7 @@ Obtains the RAT used by the CS and PS domains. This API uses a promise to return
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.getRadioTech(slotId);
 promise.then(data => {
@@ -91,7 +91,7 @@ Obtains the network status. This API uses an asynchronous callback to return the
 
 **Example**
 
-```
+```js
 radio.getNetworkState((err, data) =>{
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -117,7 +117,7 @@ Obtains the network status. This API uses an asynchronous callback to return the
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.getNetworkState(slotId, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -149,7 +149,7 @@ Obtains the network status of the SIM card in the specified slot. This API uses
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.getNetworkState(slotId);
 promise.then(data => {
@@ -177,7 +177,7 @@ Obtains the network selection mode of the SIM card in the specified slot. This A
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.getNetworkSelectionMode(slotId, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -207,7 +207,7 @@ Obtains the network selection mode of the SIM card in the specified slot. This A
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.getNetworkSelectionMode(slotId);
 promise.then(data => {
@@ -235,7 +235,7 @@ Obtains the ISO country code of the network with which the SIM card in the speci
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.getISOCountryCodeForNetwork(slotId, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -265,7 +265,7 @@ Obtains the ISO country code of the network with which the SIM card in the speci
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.getISOCountryCodeForNetwork(slotId);
 promise.then(data => {
@@ -292,7 +292,7 @@ Obtains the ID of the slot in which the primary card is located. This API uses a
 
 **Example**
 
-```
+```js
 radio.getPrimarySlotId((err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -315,7 +315,7 @@ Obtains the ID of the slot in which the primary card is located. This API uses a
 
 **Example**
 
-```
+```js
 let promise = radio.getPrimarySlotId();
 promise.then(data => {
     console.log(`getPrimarySlotId success, promise: data->${JSON.stringify(data)}`);
@@ -342,7 +342,7 @@ Obtains a list of signal strengths of the network with which the SIM card in the
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.getSignalInformation(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -372,7 +372,7 @@ Obtains a list of signal strengths of the network with which the SIM card in the
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.getSignalInformation(slotId);
 promise.then(data => {
@@ -405,7 +405,7 @@ Checks whether the current device supports 5G \(NR\).
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let result = radio.isNrSupported(slotId);
 console.log(result);
@@ -430,7 +430,7 @@ Checks whether the radio service is enabled on the primary SIM card. This API us
 
 **Example**
 
-```
+```js
 radio.isRadioOn((err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -456,7 +456,7 @@ Checks whether the radio service is enabled on the SIM card in the specified slo
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.isRadioOn(slotId, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -488,7 +488,7 @@ Checks whether the radio service is enabled. This API uses a promise to return t
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.isRadioOn(slotId);
 promise.then(data => {
@@ -516,7 +516,7 @@ Obtains the carrier name. This API uses an asynchronous callback to return the r
 
 **Example**
 
-```
+```js
 let slotId = 0;
 radio.getOperatorName(slotId, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -546,7 +546,7 @@ Obtains the carrier name. This API uses a promise to return the result.
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = radio.getOperatorName(slotId);
 promise.then(data => {
diff --git a/en/application-dev/reference/apis/js-apis-sim.md b/en/application-dev/reference/apis/js-apis-sim.md
index 85e895952f..f1f20e8d81 100644
--- a/en/application-dev/reference/apis/js-apis-sim.md
+++ b/en/application-dev/reference/apis/js-apis-sim.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```
+```js
 import sim from '@ohos.telephony.sim';
 ```
 
@@ -28,7 +28,7 @@ Checks whether the SIM card in the specified slot is activated. This API uses an
 
 **Example**
 
-```
+```js
 sim.isSimActive(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -57,7 +57,7 @@ Checks whether the SIM card in the specified slot is activated. This API uses a
 
 **Example**
 
-```
+```js
 let promise = sim.isSimActive(0);
 promise.then(data => {
     console.log(`isSimActive success, promise: data->${JSON.stringify(data)}`);
@@ -83,7 +83,7 @@ Obtains the default slot ID of the SIM card that provides voice services. This A
 
 **Example**
 
-```
+```js
 sim.getDefaultVoiceSlotId((err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -106,7 +106,7 @@ Obtains the default slot ID of the SIM card that provides voice services. This A
 
 **Example**
 
-```
+```js
 let promise = sim.getDefaultVoiceSlotId();
 promise.then(data => {
     console.log(`getDefaultVoiceSlotId success, promise: data->${JSON.stringify(data)}`);
@@ -132,7 +132,7 @@ Checks whether the application (caller) has been granted the operator permission
 
 **Example**
 
-```
+```js
 sim.hasOperatorPrivileges(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -160,7 +160,7 @@ Checks whether the application (caller) has been granted the operator permission
 
 **Example**
 
-```
+```js
 let promise = sim.hasOperatorPrivileges(0);
 promise.then(data => {
     console.log(`hasOperatorPrivileges success, promise: data->${JSON.stringify(data)}`);
@@ -186,7 +186,7 @@ Obtains the ISO country code of the SIM card in the specified slot. This API use
 
 **Example**
 
-```
+```js
 sim.getISOCountryCodeForSim(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -215,7 +215,7 @@ Obtains the ISO country code of the SIM card in the specified slot. This API use
 
 **Example**
 
-```
+```js
 let promise = sim.getISOCountryCodeForSim(0);
 promise.then(data => {
     console.log(`getISOCountryCodeForSim success, promise: data->${JSON.stringify(data)}`);
@@ -242,7 +242,7 @@ Obtains the public land mobile network (PLMN) ID of the SIM card in the specifie
 
 **Example**
 
-```
+```js
 sim.getSimOperatorNumeric(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -271,7 +271,7 @@ Obtains the PLMN ID of the SIM card in the specified slot. This API uses a promi
 
 **Example**
 
-```
+```js
 let promise = sim.getSimOperatorNumeric(0);
 promise.then(data => {
     console.log(`getSimOperatorNumeric success, promise: data->${JSON.stringify(data)}`);
@@ -298,7 +298,7 @@ Obtains the service provider name (SPN) of the SIM card in the specified slot. T
 
 **Example**
 
-```
+```js
 sim.getSimSpn(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -327,7 +327,7 @@ Obtains the SPN of the SIM card in the specified slot. This API uses a promise t
 
 **Example**
 
-```
+```js
 let promise = sim.getSimSpn(0);
 promise.then(data => {
     console.log(`getSimSpn success, promise: data->${JSON.stringify(data)}`);
@@ -354,7 +354,7 @@ Obtains the status of the SIM card in the specified slot. This API uses an async
 
 **Example**
 
-```
+```js
 sim.getSimState(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -383,7 +383,7 @@ Obtains the status of the SIM card in the specified slot. This API uses a promis
 
 **Example**
 
-```
+```js
 let promise = sim.getSimState(0);
 promise.then(data => {
     console.log(`getSimState success, promise: data->${JSON.stringify(data)}`);
@@ -409,7 +409,7 @@ Obtains the type of the SIM card in the specified slot. This API uses an asynchr
 
 **Example**
 
-```
+```js
 sim.getCardType(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -438,7 +438,7 @@ Obtains the type of the SIM card in the specified slot. This API uses a promise
 
 **Example**
 
-```
+```js
 let promise = sim.getCardType(0);
 promise.then(data => {
     console.log(`getCardType success, promise: data->${JSON.stringify(data)}`);
@@ -465,7 +465,7 @@ Checks whether the SIM card in the specified slot is installed. This API uses an
 
 **Example**
 
-```
+```js
 sim.hasSimCard(0, (err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -494,7 +494,7 @@ Checks whether the SIM card in the specified slot is installed. This API uses a
 
 **Example**
 
-```
+```js
 let promise = sim.hasSimCard(0);
 promise.then(data => {
     console.log(`hasSimCard success, promise: data->${JSON.stringify(data)}`);
@@ -520,7 +520,7 @@ Obtains the number of card slots.
 
 **Example**
 
-```
+```js
 console.log(sim.getMaxSimCount())
 ```
 
diff --git a/en/application-dev/reference/apis/js-apis-sms.md b/en/application-dev/reference/apis/js-apis-sms.md
index e874588b5e..85e8f3f411 100644
--- a/en/application-dev/reference/apis/js-apis-sms.md
+++ b/en/application-dev/reference/apis/js-apis-sms.md
@@ -6,7 +6,7 @@
 
 ## Modules to Import
 
-```
+```js
 import sms from '@ohos.telephony.sms';
 ```
 
@@ -28,7 +28,7 @@ Creates an SMS message instance based on the protocol data unit (PDU) and the sp
 
 **Example**
 
-```
+```js
 const specification = '3gpp';
 // Display PDUs using numbers in an array, for example, [0x08, 0x91, ...].
 const pdu = [0x08, 0x91];
@@ -61,7 +61,7 @@ Creates an SMS message instance based on the PDU and the specified SMS protocol.
 
 **Example**
 
-```
+```js
 const specification = '3gpp';
 // Display PDUs using numbers in an array, for example, [0x08, 0x91, ...].
 const pdu = [0x08, 0x91];
@@ -91,7 +91,7 @@ Sends an SMS message.
 
 **Example**
 
-```
+```js
 let sendCallback = function (err, data) {    
     console.log(`sendCallback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`); 
 }
@@ -124,7 +124,7 @@ Obtains the default slot of the SIM card used to send SMS messages. This API use
 
 **Example**
 
-```
+```js
 sms.getDefaultSmsSlotId((err, data) => {
     console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
 });
@@ -147,7 +147,7 @@ Obtains the default slot of the SIM card used to send SMS messages. This API use
 
 **Example**
 
-```
+```js
 let promise = sms.getDefaultSmsSlotId();
 promise.then(data => {
     console.log(`getDefaultSmsSlotId success, promise: data->${JSON.stringify(data)}`);
@@ -179,7 +179,7 @@ This is a system API and cannot be called by third-party applications.
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let smscAddr = '+861xxxxxxxxxx';
 sms.setSmscAddr(slotId, smscAddr, (err,data) => {
@@ -215,7 +215,7 @@ This is a system API and cannot be called by third-party applications.
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let smscAddr = '+861xxxxxxxxxx';
 let promise = sms.setSmscAddr(slotId, smscAddr);
@@ -248,7 +248,7 @@ This is a system API and cannot be called by third-party applications.
 
 **Example**
 
-```
+```js
 let slotId = 0;
 sms.getSmscAddr(slotId, (err, data) => {
       console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
@@ -282,7 +282,7 @@ This is a system API and cannot be called by third-party applications.
 
 **Example**
 
-```
+```js
 let slotId = 0;
 let promise = sms.getSmscAddr(slotId);
 promise.then(data => {
@@ -306,7 +306,7 @@ Checks whether the current device can send and receive SMS messages. This API wo
 | ------- | ------------------------------------------------------------ |
 | boolean | - **true**: The device can send and receive SMS messages.<br>- **false**: The device cannot send or receive SMS messages.|
 
-```
+```js
 let result = sms.hasSmsCapability(); 
 console.log(`hasSmsCapability: ${JSON.stringify(result)}`);
 ```
diff --git a/en/application-dev/reference/apis/js-apis-socket.md b/en/application-dev/reference/apis/js-apis-socket.md
index dcaf0416c8..2c83bd2e48 100644
--- a/en/application-dev/reference/apis/js-apis-socket.md
+++ b/en/application-dev/reference/apis/js-apis-socket.md
@@ -7,7 +7,7 @@
 
 ## Modules to Import
 
-```
+```js
 import socket from '@ohos.net.socket';
 ```
 
@@ -28,7 +28,7 @@ Creates a **UDPSocket** object.
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 ```
 
@@ -56,7 +56,7 @@ Binds the IP address and port number. The port number can be specified or random
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.bind({address: '192.168.xx.xxx', port: xxxx, family: 1}, err => {
   if (err) {
@@ -93,7 +93,7 @@ Binds the IP address and port number. The port number can be specified or random
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let promise = udp.bind({address: '192.168.xx.xxx', port: 8080, family: 1});
 promise .then(() => {
@@ -123,7 +123,7 @@ Sends data over a UDPSocket connection. This API uses an asynchronous callback t
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.send({
   data:'Hello, server!',
@@ -166,7 +166,7 @@ Sends data over a UDPSocket connection. This API uses a promise to return the re
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let promise = udp.send({
   data:'Hello, server!',
@@ -202,7 +202,7 @@ Closes a UDPSocket connection. This API uses an asynchronous callback to return
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.close(err => {
   if (err) {
@@ -232,7 +232,7 @@ Closes a UDPSocket connection. This API uses a promise to return the result.
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let promise = udp.close();
 promise.then(() => {
@@ -264,7 +264,7 @@ Obtains the status of the UDPSocket connection. This API uses an asynchronous ca
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.bind({address: '192.168.xx.xxx', port: xxxx, family: 1}, err => {
   if (err) {
@@ -304,7 +304,7 @@ Obtains the status of the UDPSocket connection. This API uses a promise to retur
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.bind({address: '192.168.xx.xxx', port: xxxx, family: 1}, err => {
   if (err) {
@@ -345,7 +345,7 @@ Sets other properties of the UDPSocket connection. This API uses an asynchronous
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.bind({address:'192.168.xx.xxx', port:xxxx, family:1}, err=> {
   if (err) {
@@ -397,7 +397,7 @@ Sets other properties of the UDPSocket connection. This API uses a promise to re
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let promise = udp.bind({address:'192.168.xx.xxx', port:xxxx, family:1});
 promise.then(() => {
@@ -437,7 +437,7 @@ Enables listening for message receiving events of the UDPSocket connection. This
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.on('message', value => {
 	console.log("on message, message:" + value.message + ", remoteInfo:" + value.remoteInfo);
@@ -465,7 +465,7 @@ Disables listening for message receiving events of the UDPSocket connection. Thi
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let callback = value =>{
 	console.log("on message, message:" + value.message + ", remoteInfo:" + value.remoteInfo);
@@ -494,7 +494,7 @@ Enables listening for data packet message events or close events of the UDPSocke
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.on('listening', () => {
 	console.log("on listening success");
@@ -525,7 +525,7 @@ Disables listening for data packet message events or close events of the UDPSock
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let callback1 = () =>{
 	console.log("on listening, success");
@@ -562,7 +562,7 @@ Enables listening for error events of the UDPSocket connection. This API uses an
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 udp.on('error', err => {
 	console.log("on error, err:" + JSON.stringify(err))
@@ -590,7 +590,7 @@ Disables listening for error events of the UDPSocket connection. This API uses a
 
 **Example**
 
-```
+```js
 let udp = socket.constructUDPSocketInstance();
 let callback = err =>{
 	console.log("on error, err:" + JSON.stringify(err));
@@ -680,7 +680,7 @@ Creates a **TCPSocket** object.
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 ```
 
@@ -709,7 +709,7 @@ Binds the IP address and port number. The port number can be specified or random
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 tcp.bind({address: '192.168.xx.xxx', port: xxxx, family: 1}, err => {
   if (err) {
@@ -745,7 +745,7 @@ Binds the IP address and port number. The port number can be specified or random
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.bind({address: '192.168.xx.xxx', port: xxxx, family: 1});
 promise.then(() => {
@@ -775,7 +775,7 @@ Sets up a connection to the specified IP address and port number. This API uses
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000}, err => {
   if (err) {
@@ -811,7 +811,7 @@ Sets up a connection to the specified IP address and port number. This API uses
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -844,7 +844,7 @@ Sends data over a TCPSocket connection. This API uses an asynchronous callback t
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -891,7 +891,7 @@ Sends data over a TCPSocket connection. This API uses a promise to return the re
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise1 = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise1.then(() => {
@@ -929,7 +929,7 @@ Closes a TCPSocket connection. This API uses an asynchronous callback to return
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 tcp.close(err => {
   if (err) {
@@ -959,7 +959,7 @@ Closes a TCPSocket connection. This API uses a promise to return the result.
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.close();
 promise.then(() => {
@@ -991,7 +991,7 @@ Obtains the remote address of a TCPSocket connection. This API uses an asynchron
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -1030,7 +1030,7 @@ Obtains the remote address of a TCPSocket connection. This API uses a promise to
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise1 = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise1.then(() => {
@@ -1069,7 +1069,7 @@ Obtains the status of the TCPSocket connection. This API uses an asynchronous ca
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -1109,7 +1109,7 @@ Obtains the status of the TCPSocket connection. This API uses a promise to retur
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -1148,7 +1148,7 @@ Sets other properties of the TCPSocket connection. This API uses an asynchronous
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -1203,7 +1203,7 @@ Sets other properties of the TCPSocket connection. This API uses a promise to re
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let promise = tcp.connect({ address: {address: '192.168.xx.xxx', port: xxxx, family: 1} , timeout: 6000});
 promise.then(() => {
@@ -1246,7 +1246,7 @@ Enables listening for message receiving events of the TCPSocket connection. This
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 tcp.on('message', value => {
 	console.log("on message, message:" + value.message + ", remoteInfo:" + value.remoteInfo)
@@ -1274,7 +1274,7 @@ Disables listening for message receiving events of the TCPSocket connection. Thi
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let callback = value =>{
 	console.log("on message, message:" + value.message + ", remoteInfo:" + value.remoteInfo);
@@ -1304,7 +1304,7 @@ Enables listening for connection or close events of the TCPSocket connection. Th
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 tcp.on('connect', () => {
 	console.log("on connect success")
@@ -1335,7 +1335,7 @@ Disables listening for connection or close events of the TCPSocket connection. T
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let callback1 = () =>{
 	console.log("on connect success");
@@ -1371,7 +1371,7 @@ Enables listening for error events of the TCPSocket connection. This API uses an
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 tcp.on('error', err => {
 	console.log("on error, err:" + JSON.stringify(err))
@@ -1399,7 +1399,7 @@ Disables listening for error events of the TCPSocket connection. This API uses a
 
 **Example**
 
-```
+```js
 let tcp = socket.constructTCPSocketInstance();
 let callback = err =>{
 	console.log("on error, err:" + JSON.stringify(err));
diff --git a/en/application-dev/reference/apis/js-apis-webSocket.md b/en/application-dev/reference/apis/js-apis-webSocket.md
index 1796e369ab..a1a24975f9 100644
--- a/en/application-dev/reference/apis/js-apis-webSocket.md
+++ b/en/application-dev/reference/apis/js-apis-webSocket.md
@@ -12,13 +12,13 @@ If an error occurs in any of the preceding processes, the client will receive a
 
 ## Modules to Import
 
-```
+```js
 import webSocket from '@ohos.net.webSocket';
 ```
 
 ## Complete Example
 
-```
+```js
 import webSocket from '@ohos.net.webSocket';
 
 var defaultIpAddress = "ws://";
@@ -78,7 +78,7 @@ Creates a WebSocket connection. You can use this API to create or close a WebSoc
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ```
 
@@ -107,7 +107,7 @@ Initiates a WebSocket request to establish a WebSocket connection to a given URL
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 ws.connect(url, (err, value) => {
@@ -141,7 +141,7 @@ Initiates a WebSocket request carrying specified options to establish a WebSocke
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 ws.connect(url, {
@@ -184,7 +184,7 @@ Initiates a WebSocket request carrying specified options to establish a WebSocke
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 let promise = ws.connect(url);
@@ -215,7 +215,7 @@ Sends data through a WebSocket connection. This API uses an asynchronous callbac
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 ws.connect(url, (err, value) => {
@@ -254,7 +254,7 @@ Sends data through a WebSocket connection. This API uses a promise to return the
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 ws.connect(url, (err, value) => {
@@ -286,7 +286,7 @@ Closes a WebSocket connection. This API uses an asynchronous callback to return
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 ws.close((err, value) => {
@@ -318,7 +318,7 @@ Closes a WebSocket connection carrying specified options such as **code** and **
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 ws.close({
@@ -358,7 +358,7 @@ Closes a WebSocket connection carrying specified options such as **code** and **
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let url = "ws://"
 let promise = ws.close({
@@ -391,7 +391,7 @@ Enables listening for the **open** events of a WebSocket connection. This API us
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.on('open', (err, value) => {
 	console.log("on open, status:" + value.status + ", message:" + value.message);
@@ -419,7 +419,7 @@ Disables listening for the **open** events of a WebSocket connection. This API u
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 let callback1 = (err, value) => {
 	console.log("on open, status:" + value.status + ", message:" + value.message);
@@ -451,7 +451,7 @@ Enables listening for the **message** events of a WebSocket connection. This API
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.on('message', (err, value) => {
 	console.log("on message, message:" + value);
@@ -480,7 +480,7 @@ Disables listening for the **message** events of a WebSocket connection. This AP
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.off('message');
 ```
@@ -503,7 +503,7 @@ Enables listening for the **close** events of a WebSocket connection. This API u
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.on('close', (err, value) => {
 	console.log("on close, code is " + value.code + ", reason is " + value.reason);
@@ -532,7 +532,7 @@ Disables listening for the **close** events of a WebSocket connection. This API
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.off('close');
 ```
@@ -556,7 +556,7 @@ Enables listening for the **error** events of a WebSocket connection. This API u
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.on('error', (err) => {
 	console.log("on error, error:" + JSON.stringify(err))
@@ -584,7 +584,7 @@ Disables listening for the **error** events of a WebSocket connection. This API
 
 **Example**
 
-```
+```js
 let ws = webSocket.createWebSocket();
 ws.off('error');
 ```
-- 
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