增加首选项错误码文档

Signed-off-by: Nduanweiling <duanweiling@huawei.com>

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

@@ -122,7 +122,7 @@ import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 
 let preferences = null;
-try{
+try {
     let promise = data_preferences.getPreferences(context, 'mystore');
     promise.then((object) => {
         preferences = object;
@@ -148,7 +148,7 @@ class MainAbility extends Ability{
 }
 
 let preferences = null;
-try{
+try {
     let promise = data_preferences.getPreferences(context, 'mystore');
     promise.then((object) => {
         preferences = object;
@@ -278,7 +278,7 @@ FA模型示例：
 import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 
-try{
+try {
     let promise = data_preferences.deletePreferences(context, 'mystore');
     promise.then(() => {
         console.info("Succeeded in deleting preferences.");
@@ -347,7 +347,6 @@ try {
             console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
-        expect(true).assertEqual(val);
         console.info("Succeeded in removing preferences.");
     })
 } catch (err) {
@@ -373,7 +372,6 @@ try {
             console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
-        expect(true).assertEqual(val);
         console.info("Succeeded in removing preferences.");
     })
 } catch (err) {
@@ -414,7 +412,7 @@ FA模型示例：
 import featureAbility from '@ohos.ability.featureAbility';
 let context = featureAbility.getContext();
 
-try{
+try {
     let promise = data_preferences.removePreferencesFromCache(context, 'mystore');
 	promise.then(() => {
     	console.info("Succeeded in removing preferences.");
@@ -438,7 +436,7 @@ class MainAbility extends Ability{
     }
 }
 
-try{
+try {
     let promise = data_preferences.removePreferencesFromCache(context, 'mystore');
 	promise.then(() => {
     	console.info("Succeeded in removing preferences.");
@@ -482,7 +480,6 @@ try {
             console.info("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
             return;
         }
-        expect(true).assertEqual(val);
         console.info("Succeeded in getting value of 'startup'. val： " + val);
     })
 } catch (err) {
@@ -515,7 +512,7 @@ get(key: string, defValue: ValueType): Promise<ValueType>
 **示例：**
 
 ```js
-try{
+try {
     let promise = preferences.get('startup', 'default');
     promise.then((data) => {
         console.info("Succeeded in getting value of 'startup'. Data: " + data);
@@ -610,7 +607,7 @@ put(key: string, value: ValueType, callback: AsyncCallback<void>): void
 **示例：**
 
 ```js
-try{
+try {
     preferences.put('startup', 'auto', function (err) {
         if (err) {
             console.info("Failed to put value of 'startup'. code =" + err.code + ", message =" + err.message);
@@ -648,7 +645,7 @@ put(key: string, value: ValueType): Promise<void>
 **示例：**
 
 ```js
-try{
+try {
     let promise = preferences.put('startup', 'auto');
     promise.then(() => {
         console.info("Succeeded in putting value of 'startup'.");
@@ -679,7 +676,7 @@ has(key: string, callback: AsyncCallback<boolean>): void
 **示例：**
 
 ```js
-try{
+try {
     preferences.has('startup', function (err, val) {
         if (err) {
             console.info("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
@@ -720,7 +717,7 @@ has(key: string): Promise<boolean>
 **示例：**
 
 ```js
-try{
+try {
     let promise = preferences.has('startup');
     promise.then((val) => {
         if (val) {
@@ -755,7 +752,7 @@ delete(key: string, callback: AsyncCallback<void>): void
 **示例：**
 
 ```js
-try{
+try {
     preferences.delete('startup', function (err) {
         if (err) {
             console.info("Failed to delete the key 'startup'. code =" + err.code + ", message =" + err.message);
@@ -792,7 +789,7 @@ delete(key: string): Promise<void>
 **示例：**
 
 ```js
-try{
+try {
     let promise = preferences.delete('startup');
 	promise.then(() => {
         console.info("Succeeded in deleting the key 'startup'.");
@@ -822,7 +819,7 @@ flush(callback: AsyncCallback<void>): void
 **示例：**
 
 ```js
-try{
+try {
     preferences.flush(function (err) {
         if (err) {
             console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
@@ -883,8 +880,8 @@ clear(callback: AsyncCallback<void>): void
 **示例：**
 
 ```js
-try{
-preferences.clear(function (err) {
+try {
+	preferences.clear(function (err) {
         if (err) {
             console.info("Failed to clear. code =" + err.code + ", message =" + err.message);
             return;
@@ -914,8 +911,8 @@ clear(): Promise<void>
 **示例：**
 
 ```js
-try{
-    let promise = preferences.clear()
+try {
+    let promise = preferences.clear();
 	promise.then(() => {
     	console.info("Succeeded in clearing.");
     }).catch((err) => {
@@ -971,9 +968,9 @@ try {
 			})
 		})
 	})
-    } catch (err) {
+} catch (err) {
 	console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
-    }
+}
 ```
 
 
@@ -1017,13 +1014,14 @@ try {
                     console.info("Failed to flush. Cause: " + err);
                     return;
                 }
-                console.info("Succeeded in flushing."); // observer will be called.
+                console.info("Succeeded in flushing.");
             })
             preferences.off('change', observer);
         })
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);}
+    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+}
 ```
 
 ## ValueType