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 cf4b2ffb92c380b1566f0207a220d20da6c4df4d..dd393a71ee79c61797209933310a3c12955ff462 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
@@ -623,7 +623,7 @@ 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();
 ```
@@ -639,7 +639,7 @@ class EntryAbility extends UIAbility {
   }
 }
 let context = globalThis.context;
-
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.startSearchingMDNS();
 ```
@@ -660,7 +660,7 @@ 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();
 ```
@@ -676,7 +676,7 @@ class EntryAbility extends UIAbility {
   }
 }
 let context = globalThis.context;
-
+let serviceType = "_print._tcp";
 let discoveryService = mdns.createDiscoveryService(context, serviceType);
 discoveryService.stopSearchingMDNS();
 ```
@@ -700,6 +700,8 @@ 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();
 
@@ -729,6 +731,8 @@ 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();
 
@@ -758,6 +762,8 @@ 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();
 
@@ -787,6 +793,8 @@ 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 cd0818c7e6334706fff0e267312881430de96a0e..5ecbd8a6c60543e651a5d4071d243a56bf9e9beb 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 += message;
   }
   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 += message;
   }
   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 += message;
   }
   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 += message;
   }
   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 += message;
   }
   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 += message;
   }
   console.log('on message message: ' + JSON.stringify(messageView));
   console.log('remoteInfo: ' + JSON.stringify(value.remoteInfo));