diff --git a/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md b/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md
index 5690ac8d20ab87beb5898a950ff6d41839c1c391..fab925b78e132512652558c71e28a9d02ff38f1b 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md
@@ -629,7 +629,7 @@ FA模型示例：
 // 获取context
 import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
-
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 ```
@@ -645,7 +645,7 @@ class EntryAbility extends UIAbility {
   }
 }
 let context = globalThis.context;
-
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 ```
@@ -666,7 +666,7 @@ FA模型示例：
 // 获取context
 import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
-
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.stopSearchingMDNS();
 ```
@@ -682,7 +682,7 @@ class EntryAbility extends UIAbility {
   }
 }
 let context = globalThis.context;
-
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.stopSearchingMDNS();
 ```
@@ -706,6 +706,8 @@ on(type: 'discoveryStart', callback: Callback<{serviceInfo: LocalServiceInfo, er
 
 ```js
 // 参考mdns.createDiscoveryService
+let context = globalThis.context;
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 
@@ -735,6 +737,8 @@ on(type: 'discoveryStop', callback: Callback<{serviceInfo: LocalServiceInfo, err
 
 ```js
 // 参考mdns.createDiscoveryService
+let context = globalThis.context;
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 
@@ -764,6 +768,8 @@ on(type: 'serviceFound', callback: Callback\<LocalServiceInfo>): void
 
 ```js
 // 参考mdns.createDiscoveryService
+let context = globalThis.context;
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 
@@ -793,6 +799,8 @@ on(type: 'serviceLost', callback: Callback\<LocalServiceInfo>): void
 
 ```js
 // 参考mdns.createDiscoveryService
+let context = globalThis.context;
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 
diff --git a/zh-cn/application-dev/reference/apis/js-apis-socket.md b/zh-cn/application-dev/reference/apis/js-apis-socket.md
index c1bf293b009d186d29945984ef6ee25f4d5a8c82..4abb965cd497c8bd2458a5f5cecd8c5af15ca6b6 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-socket.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-socket.md
@@ -479,12 +479,12 @@ on(type: 'message', callback: Callback\<{message: ArrayBuffer, remoteInfo: Socke
 
 ```js
 let udp = socket.constructUDPSocketInstance();
+let messageView = '';
 udp.on('message', value => {
   for (var i = 0; i < value.message.length; i++) {
     let messages = value.message[i]
     let message = String.fromCharCode(messages);
-    let messageView = '';
-    messageView += item;
+    messageView += value;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));
@@ -513,12 +513,12 @@ off(type: 'message', callback?: Callback\<{message: ArrayBuffer, remoteInfo: Soc
 
 ```js
 let udp = socket.constructUDPSocketInstance();
+let messageView = '';
 let callback = value => {
   for (var i = 0; i < value.message.length; i++) {
     let messages = value.message[i]
     let message = String.fromCharCode(messages);
-    let messageView = '';
-    messageView += item;
+    messageView += value;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));
@@ -1365,12 +1365,12 @@ on(type: 'message', callback: Callback<{message: ArrayBuffer, remoteInfo: Socket
 
 ```js
 let tcp = socket.constructTCPSocketInstance();
+let messageView = '';
 tcp.on('message', value => {
   for (var i = 0; i < value.message.length; i++) {
     let messages = value.message[i]
     let message = String.fromCharCode(messages);
-    let messageView = '';
-    messageView += item;
+    messageView += value;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));
@@ -1399,12 +1399,12 @@ off(type: 'message', callback?: Callback<{message: ArrayBuffer, remoteInfo: Sock
 
 ```js
 let tcp = socket.constructTCPSocketInstance();
+let messageView = '';
 let callback = value => {
   for (var i = 0; i < value.message.length; i++) {
     let messages = value.message[i]
     let message = String.fromCharCode(messages);
-    let messageView = '';
-    messageView += item;
+    messageView += value;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));
@@ -1888,12 +1888,12 @@ on(type: 'message', callback: Callback<{message: ArrayBuffer, remoteInfo: Socket
 
 ```js
 let tls = socket.constructTLSSocketInstance();
+let messageView = '';
 tls.on('message', value => {
   for (var i = 0; i < value.message.length; i++) {
     let messages = value.message[i]
     let message = String.fromCharCode(messages);
-    let messageView = '';
-    messageView += item;
+    messageView += value;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));
@@ -1922,12 +1922,12 @@ off(type: 'message', callback?: Callback\<{message: ArrayBuffer, remoteInfo: Soc
 
 ```js
 let tls = socket.constructTLSSocketInstance();
+let messageView = '';
 let callback = value => {
   for (var i = 0; i < value.message.length; i++) {
     let messages = value.message[i]
     let message = String.fromCharCode(messages);
-    let messageView = '';
-    messageView += item;
+    messageView += value;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));