diff --git a/zh-cn/application-dev/reference/apis/js-apis-appControl.md b/zh-cn/application-dev/reference/apis/js-apis-appControl.md
index 02da6d15a2c59a0ddd7465fdfc8d1a110ba54973..493dfa3055eaed8f71d34ede25ac761b3de30e05 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-appControl.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-appControl.md
@@ -50,8 +50,8 @@ setDisposedStatus(appId: string, disposedWant: Want): Promise\<void>
 **示例：**
 
 ```ts
-var appId = "com.example.myapplication_xxxxx";
-var want = {bundleName: 'com.example.myapplication'};
+let appId = "com.example.myapplication_xxxxx";
+let want = {bundleName: 'com.example.myapplication'};
 
 try {
     appControl.setDisposedStatus(appId, want)
@@ -96,8 +96,8 @@ setDisposedStatus(appId: string, disposedWant: Want, callback: AsyncCallback\<vo
 **示例：**
 
 ```ts
-var appId = "com.example.myapplication_xxxxx";
-var want = {bundleName: 'com.example.myapplication'};
+let appId = "com.example.myapplication_xxxxx";
+let want = {bundleName: 'com.example.myapplication'};
 
 try {
     appControl.setDisposedStatus(appId, want, (error, data) => {
@@ -147,7 +147,7 @@ getDisposedStatus(appId: string): Promise\<Want>;
 **示例：**
 
 ```ts
-var appId = "com.example.myapplication_xxxxx";
+let appId = "com.example.myapplication_xxxxx";
 
 try {
     appControl.getDisposedStatus(appId)
@@ -191,7 +191,7 @@ getDisposedStatus(appId: string, callback: AsyncCallback\<Want>): void;
 **示例：**
 
 ```ts
-var appId = "com.example.myapplication_xxxxx";
+let appId = "com.example.myapplication_xxxxx";
 
 try {
     appControl.getDisposedStatus(appId, (error, data) => {
@@ -241,7 +241,7 @@ deleteDisposedStatus(appId: string): Promise\<void>
 **示例：**
 
 ```ts
-var appId = "com.example.myapplication_xxxxx";
+let appId = "com.example.myapplication_xxxxx";
 
 try {
     appControl.deleteDisposedStatus(appId)
@@ -285,7 +285,7 @@ deleteDisposedStatus(appId: string, callback: AsyncCallback\<void>) : void
 **示例：**
 
 ```ts
-var appId = "com.example.myapplication_xxxxx";
+let appId = "com.example.myapplication_xxxxx";
 try {
     appControl.deleteDisposedStatus(appId, (error, data) => {
         if (error) {
@@ -308,8 +308,8 @@ appId是应用的唯一标识，由应用Bundle名称和签名信息决定，可
 ```ts
 import bundleManager from '@ohos.bundle.bundleManager';
 
-var bundleName = 'com.example.myapplication';
-var appId;
+let bundleName = 'com.example.myapplication';
+let appId: string;
 try {
     bundleManager.getBundleInfo(bundleName, bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_SIGNATURE_INFO)
         .then((data) => {
diff --git a/zh-cn/application-dev/reference/apis/js-apis-overlay.md b/zh-cn/application-dev/reference/apis/js-apis-overlay.md
index 443442ccd92a8c956cd49ae197425e8ea9aa804e..b540942c9901912b788c253abfe3f7284f4e5880 100755
--- a/zh-cn/application-dev/reference/apis/js-apis-overlay.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-overlay.md
@@ -45,8 +45,8 @@ setOverlayEnabled(moduleName:string, isEnabled: boolean): Promise\<void>;
 **示例：**
 
 ```ts
-var moduleName = "feature";
-var isEnabled = false;
+let moduleName = "feature";
+let isEnabled = false;
 
 try {
     overlay.setOverlayEnabled(moduleName, isEnabled)
@@ -88,8 +88,8 @@ setOverlayEnabled(moduleName:string, isEnabled: boolean, callback: AsyncCallback
 **示例：**
 
 ```ts
-var moduleName = "feature";
-var isEnabled = false;
+let moduleName = "feature";
+let isEnabled = false;
 
 try {
     overlay.setOverlayEnabled(moduleName, isEnabled, (err, data) => {
@@ -144,9 +144,9 @@ setOverlayEnabledByBundleName(bundleName:string, moduleName:string, isEnabled: b
 **示例：**
 
 ```ts
-var bundleName = "com.example.myapplication_xxxxx";
-var moduleName = "feature";
-var isEnabled = false;
+let bundleName = "com.example.myapplication_xxxxx";
+let moduleName = "feature";
+let isEnabled = false;
 
 try {
     overlay.setOverlayEnabledByBundleName(bundleName, moduleName, isEnabled)
@@ -195,9 +195,9 @@ setOverlayEnabledByBundleName(bundleName:string, moduleName:string, isEnabled: b
 **示例：**
 
 ```ts
-var bundleName = "com.example.myapplication_xxxxx";
-var moduleName = "feature";
-var isEnabled = false;
+let bundleName = "com.example.myapplication_xxxxx";
+let moduleName = "feature";
+let isEnabled = false;
 
 try {
     overlay.setOverlayEnabledByBundleName(bundleName, moduleName, isEnabled, (err, data) => {
@@ -245,7 +245,7 @@ getOverlayModuleInfo(moduleName: string): Promise\<OverlayModuleInfo>;
 **示例：**
 
 ```ts
-var moduleName = "feature";
+let moduleName = "feature";
 
 (async() => {
     try {
@@ -285,7 +285,7 @@ getOverlayModuleInfo(moduleName: string, callback: AsyncCallback\<OverlayModuleI
 **示例：**
 
 ```ts
-var moduleName = "feature";
+let moduleName = "feature";
 try {
     overlay.getOverlayModuleInfo(moduleName, (err, data) => {
         if (err) {
@@ -331,7 +331,7 @@ getTargetOverlayModuleInfos(targetModuleName: string): Promise\<Array\<OverlayMo
 **示例：**
 
 ```ts
-var targetModuleName = "feature";
+let targetModuleName = "feature";
 
 (async() => {
     try {
@@ -370,7 +370,7 @@ getTargetOverlayModuleInfos(targetModuleName: string, callback: AsyncCallback\<A
 **示例：**
 
 ```ts
-var targetModuleName = "feature";
+let targetModuleName = "feature";
 try {
     overlay.getTargetOverlayModuleInfos(targetModuleName, (err, data) => {
         if (err) {
@@ -423,8 +423,8 @@ getOverlayModuleInfoByBundleName(bundleName: string, moduleName?: string): Promi
 **示例：**
 
 ```ts
-var bundleName = "com.example.myapplication_xxxxx";
-var moduleName = "feature";
+let bundleName = "com.example.myapplication_xxxxx";
+let moduleName = "feature";
 
 (async() => {
     try {
@@ -470,8 +470,8 @@ getOverlayModuleInfoByBundleName(bundleName: string, moduleName: string, callbac
 **示例：**
 
 ```ts
-var bundleName = "com.example.myapplication_xxxxx";
-var moduleName = "feature";
+let bundleName = "com.example.myapplication_xxxxx";
+let moduleName = "feature";
 
 try {
     overlay.getOverlayModuleInfoByBundleName(bundleName, moduleName, (err, data) => {
@@ -517,7 +517,7 @@ getOverlayModuleInfoByBundleName(bundleName: string, callback: AsyncCallback\<Ar
 **示例：**
 
 ```ts
-var bundleName = "com.example.myapplication_xxxxx";
+let bundleName = "com.example.myapplication_xxxxx";
 
 try {
     overlay.getOverlayModuleInfoByBundleName(bundleName, (err, data) => {
@@ -571,8 +571,8 @@ getTargetOverlayModuleInfosByBundleName(targetBundleName: string, moduleName?: s
 **示例：**
 
 ```ts
-var targetBundleName = "com.example.myapplication_xxxxx";
-var moduleName = "feature";
+let targetBundleName = "com.example.myapplication_xxxxx";
+let moduleName = "feature";
 
 (async() => {
     try {
@@ -618,8 +618,8 @@ getTargetOverlayModuleInfosByBundleName(targetBundleName: string, moduleName: st
 **示例：**
 
 ```ts
-var targetBundleName = "com.example.myapplication_xxxxx";
-var moduleName = "feature";
+let targetBundleName = "com.example.myapplication_xxxxx";
+let moduleName = "feature";
 
 try {
     overlay.getTargetOverlayModuleInfosByBundleName(targetBundleName, moduleName, (err, data) => {
@@ -665,7 +665,7 @@ getTargetOverlayModuleInfosByBundleName(targetBundleName: string, callback: Asyn
 **示例：**
 
 ```ts
-var targetBundleName = "com.example.myapplication_xxxxx";
+let targetBundleName = "com.example.myapplication_xxxxx";
 
 try {
     overlay.getTargetOverlayModuleInfosByBundleName(targetBundleName, (err, data) => {