!21652 修复preferences示例代码编译问题与代码格式化

Merge pull request !21652 from 常佳兴/master

zh-cn/application-dev/reference/apis/js-apis-data-preferences.md

@@ -195,7 +195,7 @@ let context = featureAbility.getContext();
 let preferences = null;
 
 try {
-    data_preferences.getPreferences(context, {name: 'mystore'}, function (err, val) {
+    data_preferences.getPreferences(context, { name: 'mystore' }, function (err, val) {
         if (err) {
             console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
             return;
@@ -219,7 +219,7 @@ let preferences = null;
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         try {
-            data_preferences.getPreferences(this.context, {name: 'mystore', dataGroupId:'myId'}, function (err, val) {
+            data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err, val) {
                 if (err) {
                     console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
                     return;
@@ -275,7 +275,7 @@ let context = featureAbility.getContext();
 
 let preferences = null;
 try {
-    let promise = data_preferences.getPreferences(context, {name: 'mystore'});
+    let promise = data_preferences.getPreferences(context, { name: 'mystore' });
     promise.then((object) => {
         preferences = object;
         console.info("Succeeded in getting preferences.");
@@ -297,7 +297,7 @@ let preferences = null;
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         try {
-            let promise = data_preferences.getPreferences(this.context, {name: 'mystore', dataGroupId:'myId'});
+            let promise = data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' });
             promise.then((object) => {
                 preferences = object;
                 console.info("Succeeded in getting preferences.");
@@ -493,7 +493,7 @@ import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 
 try {
-    data_preferences.deletePreferences(context, {name: 'mystore'}, function (err) {
+    data_preferences.deletePreferences(context, { name: 'mystore' }, function (err) {
         if (err) {
             console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
             return;
@@ -513,7 +513,7 @@ import UIAbility from '@ohos.app.ability.UIAbility';
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         try {
-            data_preferences.deletePreferences(this.context, {name: 'mystore', dataGroupId:'myId'}, function (err) {
+            data_preferences.deletePreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err) {
                 if (err) {
                     console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
                     return;
@@ -571,7 +571,7 @@ import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 
 try {
-    let promise = data_preferences.deletePreferences(context, {name: 'mystore'});
+    let promise = data_preferences.deletePreferences(context, { name: 'mystore' });
     promise.then(() => {
         console.info("Succeeded in deleting preferences.");
     }).catch((err) => {
@@ -590,7 +590,7 @@ import UIAbility from '@ohos.app.ability.UIAbility';
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         try{
-            let promise = data_preferences.deletePreferences(this.context, {name: 'mystore', dataGroupId:'myId'});
+            let promise = data_preferences.deletePreferences(this.context, { name: 'mystore', dataGroupId:'myId' });
             promise.then(() => {
                 console.info("Succeeded in deleting preferences.");
             }).catch((err) => {
@@ -821,7 +821,7 @@ FA模型示例：
 import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 try {
-    data_preferences.removePreferencesFromCache(context, {name: 'mystore'}, function (err) {
+    data_preferences.removePreferencesFromCache(context, { name: 'mystore' }, function (err) {
         if (err) {
             console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             return;
@@ -841,7 +841,7 @@ import UIAbility from '@ohos.app.ability.UIAbility';
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         try {
-            data_preferences.removePreferencesFromCache(this.context, {name: 'mystore', dataGroupId:'myId'}, function (err) {
+            data_preferences.removePreferencesFromCache(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err) {
                 if (err) {
                     console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
                     return;
@@ -898,7 +898,7 @@ FA模型示例：
 import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 try {
-    let promise = data_preferences.removePreferencesFromCache(context, {name: 'mystore'});
+    let promise = data_preferences.removePreferencesFromCache(context, { name: 'mystore' });
     promise.then(() => {
         console.info("Succeeded in removing preferences.");
     }).catch((err) => {
@@ -917,7 +917,7 @@ import UIAbility from '@ohos.app.ability.UIAbility';
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         try {
-            let promise = data_preferences.removePreferencesFromCache(this.context, {name: 'mystore', dataGroupId:'myId'});
+            let promise = data_preferences.removePreferencesFromCache(this.context, { name: 'mystore', dataGroupId:'myId' });
             promise.then(() => {
                 console.info("Succeeded in removing preferences.");
             }).catch((err) => {
@@ -1660,7 +1660,7 @@ on(type: 'multiProcessChange', callback: Callback<{ key : string }>): void
 
 ```js
 try {
-	data_preferences.getPreferences(this.context, {name: 'mystore', dataGroupId:'myId'}, function (err, preferences) {
+    data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err, preferences) {
         if (err) {
             console.info("Failed to get preferences.");
             return;
@@ -1693,7 +1693,6 @@ try {
 **示例2：**
 
 ```js
-let preferences = null;
 try {
     data_preferences.getPreferences(this.context, { name: 'mystore' }, function (err, val) {
         if (err) {
@@ -1704,7 +1703,7 @@ try {
         let observer = function (key) {
             console.info("The key " + key + " changed.");
             try {
-                data_preferences.removePreferencesFromCache(context, { name: 'mystore' }, function (err) {
+                data_preferences.removePreferencesFromCache(this.context, { name: 'mystore' }, function (err) {
                     if (err) {
                         console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
                         return;
@@ -1717,7 +1716,7 @@ try {
             }
 
             try {
-                data_preferences.getPreferences(context, { name: 'mystore' }, function (err, val) {
+                data_preferences.getPreferences(this.context, { name: 'mystore' }, function (err, val) {
                     if (err) {
                         console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
                         return;
@@ -1820,7 +1819,7 @@ off(type: 'multiProcessChange', callback?: Callback<{ key : string }>): vo
 
 ```js
 try {
-    data_preferences.getPreferences(this.context, {name: 'mystore', dataGroupId:'myId'}, function (err, preferences) {
+    data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err, preferences) {
         if (err) {
             console.info("Failed to get preferences.");
             return;