优化《@ohos.app.ability.appManager (appManager)》章节部分内容，修复'on'示例代码问题

Signed-off-by: zyjhandsome <zyjhandsome@126.com>

zh-cn/application-dev/reference/apis/js-apis-app-ability-appManager.md

@@ -27,10 +27,10 @@ static isRunningInStabilityTest(callback: AsyncCallback<boolean>): void
   |AsyncCallback<boolean> |以回调方式返回接口运行结果及当前是否处于稳定性测试场景，可进行错误处理或其他自定义处理。true: 处于稳定性测试场景，false：处于非稳定性测试场景。 | 
 
 **示例：**
-    
+
 ```ts
 appManager.isRunningInStabilityTest((err, flag) => {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         conseole.log("isRunningInStabilityTest faile, err: " + JSON.stringify(err));
     } else {
         console.log("The result of isRunningInStabilityTest is:" + JSON.stringify(flag));
@@ -54,7 +54,7 @@ static isRunningInStabilityTest(): Promise<boolean>
   | Promise<boolean> | 以Promise方式返回接口运行结果及当前是否处于稳定性测试场景，可进行错误处理或其他自定义处理。true: 处于稳定性测试场景，false：处于非稳定性测试场景。 | 
 
 **示例：**
-    
+
 ```ts
 appManager.isRunningInStabilityTest().then((flag) => {
     console.log("The result of isRunningInStabilityTest is:" + JSON.stringify(flag));
@@ -79,7 +79,7 @@ isRamConstrainedDevice(): Promise\<boolean>;
   | Promise&lt;boolean&gt; | 以Promise方式返回接口运行结果及当前设备是否为ram受限设备，可进行错误处理或其他自定义处理。true：当前设备为ram受限设备，false：当前设备为非ram受限设备。 | 
 
 **示例：**
-    
+
 ```ts
 appManager.isRamConstrainedDevice().then((data) => {
     console.log("The result of isRamConstrainedDevice is:" + JSON.stringify(data));
@@ -103,10 +103,10 @@ isRamConstrainedDevice(callback: AsyncCallback\<boolean>): void;
   | AsyncCallback&lt;boolean&gt; |以回调方式返回接口运行结果及当前设备是否为ram受限设备，可进行错误处理或其他自定义处理。true：当前设备为ram受限设备，false：当前设备为非ram受限设备。 | 
 
 **示例：**
-    
+
 ```ts
 appManager.isRamConstrainedDevice((err, data) => {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("isRamConstrainedDevice faile, err: " + JSON.stringify(err));
     } else {
         console.log("The result of isRamConstrainedDevice is:" + JSON.stringify(data));
@@ -129,7 +129,7 @@ getAppMemorySize(): Promise\<number>;
   | Promise&lt;number&gt; | 以Promise方式返回接口运行结果及应用程序内存大小，可进行错误处理或其他自定义处理。 | 
 
 **示例：**
-    
+
 ```ts
 appManager.getAppMemorySize().then((data) => {
     console.log("The size of app memory is:" + JSON.stringify(data));
@@ -153,10 +153,10 @@ getAppMemorySize(callback: AsyncCallback\<number>): void;
   |AsyncCallback&lt;number&gt; |以回调方式返回接口运行结果及应用程序内存大小，可进行错误处理或其他自定义处理。 | 
 
 **示例：**
-    
+
 ```ts
 appManager.getAppMemorySize((err, data) => {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("getAppMemorySize faile, err: " + JSON.stringify(err));
     } else {
         console.log("The size of app memory is:" + JSON.stringify(data));
@@ -183,7 +183,7 @@ getProcessRunningInformation(): Promise\<Array\<ProcessRunningInformation>>;
 | Promise\<Array\<[ProcessRunningInformation](js-apis-inner-application-processRunningInformation.md)>> | 以Promise方式返回接口运行结果及有关运行进程的信息，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
 appManager.getProcessRunningInformation().then((data) => {
     console.log("The process running information is:" + JSON.stringify(data));
@@ -211,10 +211,10 @@ getProcessRunningInformation(callback: AsyncCallback\<Array\<ProcessRunningInfor
 |AsyncCallback\<Array\<[ProcessRunningInformation](js-apis-inner-application-processRunningInformation.md)>> | 以回调方式返回接口运行结果及有关运行进程的信息，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
 appManager.getProcessRunningInformation((err, data) => {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("getProcessRunningInformation faile, err: " + JSON.stringify(err));
     } else {
         console.log("The process running information is:" + JSON.stringify(data));
@@ -248,30 +248,30 @@ on(type: "applicationState", observer: ApplicationStateObserver): number;
 | number | 已注册观测器的数字代码，可用于off接口取消注册观测器。|
 
 **示例：**
-    
+
 ```js
-var applicationStateObserver = {
+let applicationStateObserver = {
     onForegroundApplicationChanged(appStateData) {
-        console.log('------------ onForegroundApplicationChanged -----------' + JSON.stringify(appStateData));
+        console.log(`[appManager] onForegroundApplicationChanged: ${JSON.stringify(appStateData)}`);
     },
     onAbilityStateChanged(abilityStateData) {
-        console.log('------------ onAbilityStateChanged -----------' + JSON.stringify(abilityStateData));
+        console.log(`[appManager] onAbilityStateChanged: ${JSON.stringify(abilityStateData)}`);
     },
     onProcessCreated(processData) {
-        console.log('------------ onProcessCreated -----------' + JSON.stringify(processData));
+        console.log(`[appManager] onProcessCreated: ${JSON.stringify(processData)}`);
     },
     onProcessDied(processData) {
-        console.log('------------ onProcessDied -----------' + JSON.stringify(processData));
+        console.log(`[appManager] onProcessDied: ${JSON.stringify(processData)}`);
     },
     onProcessStateChanged(processData) {
-        console.log('------------ onProcessStateChanged -----------' + JSON.stringify(processData));
+        console.log(`[appManager] onProcessStateChanged: ${JSON.stringify(processData)}`);
     }
 }
 try {
-    const observerCode = appManager.on(applicationStateObserver);
-    console.log('-------- observerCode: ---------' + observerCode);
+    const observerCode = appManager.on('applicationState', applicationStateObserver);
+    console.log(`[appManager] observerCode: ${observerCode}`);
 } catch (paramError) {
-    console.log('error: ' + paramError.code + ', ' + paramError.message);
+    console.log(`[appManager] error: ${paramError.code}, ${paramError.message} `);
 }
 ```
 
@@ -293,7 +293,7 @@ on(type: "applicationState", observer: ApplicationStateObserver, bundleNameList:
 | -------- | -------- | -------- | -------- |
 | type | string | 是 | 调用接口类型，固定填"applicationState"字符串。 |
 | observer | [ApplicationStateObserver](./js-apis-inner-application-applicationStateObserver.md) | 是 | 应用状态观测器，用于观测应用的生命周期变化。 |
-| bundleNameList | Array<string> | 是 | 表示需要注册监听的bundleName数组。最大值128。 |
+| bundleNameList | `Array<string>` | 是 | 表示需要注册监听的bundleName数组。最大值128。 |
 
 **返回值：**
 
@@ -302,33 +302,33 @@ on(type: "applicationState", observer: ApplicationStateObserver, bundleNameList:
 | number | 已注册观测器的数字代码，可用于off接口注销观测器。|
 
 **示例：**
-    
+
 ```js
-var applicationStateObserver = {
+let applicationStateObserver = {
     onForegroundApplicationChanged(appStateData) {
-        console.log('------------ onForegroundApplicationChanged -----------' + JSON.stringify(appStateData));
+        console.log(`[appManager] onForegroundApplicationChanged: ${JSON.stringify(appStateData)}`);
     },
     onAbilityStateChanged(abilityStateData) {
-        console.log('------------ onAbilityStateChanged -----------' + JSON.stringify(abilityStateData));
+        console.log(`[appManager] onAbilityStateChanged: ${JSON.stringify(abilityStateData)}`);
     },
     onProcessCreated(processData) {
-        console.log('------------ onProcessCreated -----------' + JSON.stringify(processData));
+        console.log(`[appManager] onProcessCreated: ${JSON.stringify(processData)}`);
     },
     onProcessDied(processData) {
-        console.log('------------ onProcessDied -----------' + JSON.stringify(processData));
+        console.log(`[appManager] onProcessDied: ${JSON.stringify(processData)}`);
     },
     onProcessStateChanged(processData) {
-        console.log('------------ onProcessStateChanged -----------' + JSON.stringify(processData));
+        console.log(`[appManager] onProcessStateChanged: ${JSON.stringify(processData)}`);
     }
 }
-var bundleNameList = ['bundleName1', 'bundleName2'];
+let bundleNameList = ['bundleName1', 'bundleName2'];
 try {
     const observerCode = appManager.on("applicationState", applicationStateObserver, bundleNameList);
-    console.log('-------- observerCode: ---------', observerCode);
+    console.log(`[appManager] observerCode: ${observerCode}`);
 } catch (paramError) {
-    console.log('error: ' + paramError.code + ', ' + paramError.message);
+    console.log(`[appManager] error: ${paramError.code}, ${paramError.message} `);
 }
- ```
+```
 
 ## appManager.off
 
@@ -351,12 +351,12 @@ off(type: "applicationState", observerId: number,  callback: AsyncCallback\<void
 | callback | AsyncCallback\<void> | 是 | 以回调方式返回接口运行结果，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
-var observerId = 100;
+let observerId = 100;
 
 function unregisterApplicationStateObserverCallback(err) {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("unregisterApplicationStateObserverCallback faile, err: " + JSON.stringify(err));
     } else {
         console.log("unregisterApplicationStateObserverCallback success.");
@@ -395,9 +395,9 @@ off(type: "applicationState", observerId: number): Promise\<void>;
 | Promise\<void> | 以Promise方式返回接口运行结果，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
-var observerId = 100;
+let observerId = 100;
     
 try {
     appManager.off(observerId).then((data) => {
@@ -429,10 +429,10 @@ getForegroundApplications(callback: AsyncCallback\<Array\<AppStateData>>): void;
 | callback | AsyncCallback\<Array\<[AppStateData](js-apis-inner-application-appStateData.md)>> | 是 | 以回调方式返回接口运行结果及应用状态数据数组，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
 function getForegroundApplicationsCallback(err, data) {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("getForegroundApplicationsCallback fail, err: " + JSON.stringify(err));
     } else {
         console.log("getForegroundApplicationsCallback success, data: " + JSON.stringify(data));
@@ -464,10 +464,10 @@ getForegroundApplications(callback: AsyncCallback\<Array\<AppStateData>>): void;
 | callback | AsyncCallback\<Array\<[AppStateData](js-apis-inner-application-appStateData.md)>> | 是 | 以Promise方式返回接口运行结果及应用状态数据数组，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
 function getForegroundApplicationsCallback(err, data) {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("getForegroundApplicationsCallback fail, err: " + JSON.stringify(err));
     } else {
         console.log("getForegroundApplicationsCallback success, data: " + JSON.stringify(data));
@@ -499,7 +499,7 @@ getForegroundApplications(): Promise\<Array\<AppStateData>>;
 | Promise\<Array\<[AppStateData](js-apis-inner-application-appStateData.md)>> | 返回前台进程应用程序的数组。 |
 
 **示例：**
-    
+
 ```ts
 appManager.getForegroundApplications().then((data) => {
     console.log("getForegroundApplications success, data: " + JSON.stringify(data));
@@ -530,8 +530,8 @@ killProcessWithAccount(bundleName: string, accountId: number): Promise\<void\>
 **示例：**
 
 ```ts
-var bundleName = 'bundleName';
-var accountId = 0;
+let bundleName = 'bundleName';
+let accountId = 0;
 try {
     appManager.killProcessWithAccount(bundleName, accountId).then(() => {
         console.log("killProcessWithAccount success");
@@ -570,7 +570,7 @@ killProcessWithAccount(bundleName: string, accountId: number, callback: AsyncCal
 var bundleName = 'bundleName';
 var accountId = 0;
 function killProcessWithAccountCallback(err, data) {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("killProcessWithAccountCallback fail, err: " + JSON.stringify(err));
     } else {
         console.log("killProcessWithAccountCallback success.");
@@ -599,11 +599,11 @@ killProcessesByBundleName(bundleName: string, callback: AsyncCallback\<void>);
 | callback | AsyncCallback\<void> | 是 | 以回调方式返回接口运行结果，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
 var bundleName = 'bundleName';
 function killProcessesByBundleNameCallback(err, data) {
-    if (err.code != 0) {
+    if (err.code !== 0) {
         console.log("killProcessesByBundleNameCallback fail, err: " + JSON.stringify(err));
     } else {
         console.log("killProcessesByBundleNameCallback success.");
@@ -641,9 +641,9 @@ killProcessesByBundleName(bundleName: string): Promise\<void>;
 | Promise\<void> | 返回执行结果。 |
 
 **示例：**
-    
+
 ```ts
-var bundleName = 'bundleName';
+let bundleName = 'bundleName';
 try {
     appManager.killProcessesByBundleName(bundleName).then((data) => {
         console.log("killProcessesByBundleName success.");
@@ -675,9 +675,9 @@ clearUpApplicationData(bundleName: string, callback: AsyncCallback\<void>);
 | callback | AsyncCallback\<void> | 是 | 以回调方式返回接口运行结果，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
-var bundleName = 'bundleName';
+let bundleName = 'bundleName';
 function clearUpApplicationDataCallback(err, data) {
     if (err) {
         console.log("clearUpApplicationDataCallback fail, err: " + JSON.stringify(err));
@@ -717,9 +717,9 @@ clearUpApplicationData(bundleName: string): Promise\<void>;
 | Promise\<void> | 以Promise方式返回接口运行结果，可进行错误处理或其他自定义处理。 |
 
 **示例：**
-    
+
 ```ts
-var bundleName = 'bundleName';
+let bundleName = 'bundleName';
 try {
     appManager.clearUpApplicationData(bundleName).then((data) => {
         console.log("clearUpApplicationData success.");