diff --git a/zh-cn/application-dev/database/database-distributedobject-guidelines.md b/zh-cn/application-dev/database/database-distributedobject-guidelines.md
index 0a441dc09b9d6c29b5d3e663e1fb0f5132c09833..3a7a8883ecd37495466335f059ac9bb14d041c75 100644
--- a/zh-cn/application-dev/database/database-distributedobject-guidelines.md
+++ b/zh-cn/application-dev/database/database-distributedobject-guidelines.md
@@ -142,7 +142,7 @@
    function grantPermission() {
      let permissions = ['ohos.permission.DISTRIBUTED_DATASYNC'];
      context.requestPermissionsFromUser(permissions).then((data) => {
-       console.log('success: ${data}');
+       console.info('success: ${data}');
      }).catch((error) => {
        console.error('failed: ${error}');
      });
diff --git a/zh-cn/application-dev/database/database-preference-guidelines.md b/zh-cn/application-dev/database/database-preference-guidelines.md
index 2c7a5bfbc24291f6471b879daaa17327858b1633..b49c590898ebf0a1b631f89ae6b2581ff9ad6d73 100644
--- a/zh-cn/application-dev/database/database-preference-guidelines.md
+++ b/zh-cn/application-dev/database/database-preference-guidelines.md
@@ -114,21 +114,19 @@
    ```ts
    // 获取context
    import UIAbility from '@ohos.app.ability.UIAbility';
-   let context = null;
    let preferences = null;
    export default class EntryAbility extends UIAbility {
-       onWindowStageCreate(windowStage){
-           context = this.context;
+       onWindowStageCreate(windowStage) {
+           let promise = data_preferences.getPreferences(this.context, 'mystore');
+            promise.then((pref) => {
+                preferences = pref;
+            }).catch((err) => {
+                console.info("Failed to get preferences.");
+            })
        }
    }
    
-   let promise = data_preferences.getPreferences(context, 'mystore');
    
-   promise.then((pref) => {
-       preferences = pref;
-   }).catch((err) => {
-       console.info("Failed to get preferences.");
-   })
    ```
 
 3. 存入数据。
diff --git a/zh-cn/application-dev/reference/apis/js-apis-data-distributedobject.md b/zh-cn/application-dev/reference/apis/js-apis-data-distributedobject.md
index e7a6f1413b2bd9983151e4bee9b324499fbe832f..93a97b17a6562534741231e0170108f6e4ae740d 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-data-distributedobject.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-data-distributedobject.md
@@ -15,7 +15,7 @@ import distributedObject from '@ohos.data.distributedDataObject';
 
 ## distributedObject.create<sup>9+</sup>
 
-create(context: Context, source: object): DistributedObjectV9
+create(context: Context, source: object): DataObject
 
 创建一个分布式数据对象。
 
@@ -32,7 +32,7 @@ create(context: Context, source: object): DistributedObjectV9
 
 | 类型 | 说明 |
 | -------- | -------- |
-| [DistributedObjectV9](#distributedobjectv9) | 创建完成的分布式数据对象。 |
+| [DataObject](#dataobject) | 创建完成的分布式数据对象。 |
 
 **示例：**
 
@@ -44,7 +44,7 @@ import distributedObject from '@ohos.data.distributedDataObject';
 import featureAbility from '@ohos.ability.featureAbility';
 // 获取context
 let context = featureAbility.getContext();
-// 创建对象，该对象包含4个属性类型，string,number,boolean和Object
+// 创建对象，该对象包含4个属性类型：string、number、boolean和Object
 let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
 ```
 
@@ -55,15 +55,14 @@ Stage模型示例：
 import distributedObject from '@ohos.data.distributedDataObject';
 import UIAbility from '@ohos.app.ability.UIAbility';
 
-// 获取context
-let context;
+let g_object = null;
+
 class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
-        context = this.context
+        // 创建对象，该对象包含4个属性类型：string、number、boolean和Object
+        g_object = distributedObject.create(this.context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
     }
 }
-// 创建对象，该对象包含4个属性类型，string,number,boolean和Object
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
 ```
 
 ## distributedObject.genSessionId
@@ -109,9 +108,9 @@ revokeSave接口回调信息。
 | -------- | -------- | -------- | -------- |
 | sessionId | string | 是 | 多设备协同的唯一标识。 |
 
-## DistributedObjectV9
+## DataObject
 
-表示一个分布式数据对象。
+表示一个分布式数据对象。在使用以下接口前，需调用[create()](#distributedobjectcreate9)获取DataObject对象。
 
 ### setSessionId<sup>9+</sup>
 
@@ -140,36 +139,11 @@ setSessionId(sessionId: string, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-FA模型示例
-
 ```js
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
+let g_object;
 // g_object加入分布式组网
 g_object.setSessionId(distributedObject.genSessionId(), ()=>{
-    console.log("join session");
-});
-```
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-// g_object加入分布式组网
-g_object.setSessionId(distributedObject.genSessionId(), ()=>{
-    console.log("join session");
+    console.info("join session");
 });
 ```
 
@@ -199,44 +173,15 @@ setSessionId(callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-FA模型示例
-
 ```js
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
+let g_object;
 // g_object加入分布式组网
 g_object.setSessionId(distributedObject.genSessionId(), ()=>{
-    console.log("join session");
+    console.info("join session");
 });
 // 退出分布式组网
 g_object.setSessionId(() => {
-    console.log("leave all lession.");
-});
-```
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-// g_object加入分布式组网
-g_object.setSessionId(distributedObject.genSessionId(), ()=>{
-    console.log("join session");
-});
-// 退出分布式组网
-g_object.setSessionId(() => {
-    console.log("leave all lession.");
+    console.info("leave all lession.");
 });
 ```
 
@@ -278,35 +223,7 @@ FA模型示例
 import distributedObject from '@ohos.data.distributedDataObject';
 import featureAbility from '@ohos.ability.featureAbility';
 // 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-// g_object加入分布式组网
-g_object.setSessionId(distributedObject.genSessionId()).then (()=>{
-    console.log("join session.");
-    }).catch((error)=>{
-        console.info("error:" + error.code + error.message);
-});
-// 退出分布式组网
-g_object.setSessionId().then (()=>{
-    console.log("leave all lession.");
-    }).catch((error)=>{
-        console.info("error:" + error.code + error.message);
-});
-```
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
+let g_object;
 // g_object加入分布式组网
 g_object.setSessionId(distributedObject.genSessionId()).then (()=>{
     console.info("join session.");
@@ -315,7 +232,7 @@ g_object.setSessionId(distributedObject.genSessionId()).then (()=>{
 });
 // 退出分布式组网
 g_object.setSessionId().then (()=>{
-    console.log("leave all lession.");
+    console.info("leave all lession.");
     }).catch((error)=>{
         console.info("error:" + error.code + error.message);
 });
@@ -338,39 +255,8 @@ on(type: 'change', callback: Callback<{ sessionId: string, fields: Array&lt;stri
 
 **示例：**
 
-FA模型示例
-
 ```js
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-globalThis.changeCallback = (sessionId, changeData) => {
-    console.info("change" + sessionId);
-    if (changeData != null && changeData != undefined) {
-        changeData.forEach(element => {
-        console.info("changed !" + element + " " + g_object[element]);
-        });
-    }
-}
-g_object.on("change", globalThis.changeCallback);
-```
-
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
+let g_object;
 globalThis.changeCallback = (sessionId, changeData) => {
     console.info("change" + sessionId);
     if (changeData != null && changeData != undefined) {
@@ -400,34 +286,8 @@ off(type: 'change', callback?: Callback<{ sessionId: string, fields: Array&lt;st
 
 **示例：**
 
-FA模型示例
-
 ```js
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-// 删除数据变更回调changeCallback
-g_object.off("change", globalThis.changeCallback);
-// 删除所有的数据变更回调
-g_object.off("change");
-```
-
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
+let g_object;
 // 删除数据变更回调changeCallback
 g_object.off("change", globalThis.changeCallback);
 // 删除所有的数据变更回调
@@ -451,37 +311,14 @@ on(type: 'status', callback: Callback<{ sessionId: string, networkId: string, st
 
 **示例：**
 
-FA模型示例
-
 ```js
 import distributedObject from '@ohos.data.distributedDataObject';
 import featureAbility from '@ohos.ability.featureAbility';
 // 获取context
-let context = featureAbility.getContext();
+let g_object;
 globalThis.statusCallback = (sessionId, networkId, status) => {
     globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
 }
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-g_object.on("status", globalThis.statusCallback);
-```
-
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-globalThis.statusCallback = (sessionId, networkId, status) => {
-    globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
 g_object.on("status", globalThis.statusCallback);
 ```
 
@@ -503,37 +340,8 @@ off(type: 'status', callback?: Callback<{ sessionId: string, deviceId: string, s
 
 **示例：**
 
-FA模型示例
-
 ```js
-import distributedObject from '@ohos.data.distributedDataObject'; 
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
-globalThis.statusCallback = (sessionId, networkId, status) => {
-    globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
-}
-// 删除上下线回调changeCallback
-g_object.off("status",globalThis.statusCallback);
-// 删除所有的上下线回调
-g_object.off("status");
-```
-
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject'; 
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
+let g_object;
 globalThis.statusCallback = (sessionId, networkId, status) => {
     globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
 }
@@ -568,38 +376,11 @@ save(deviceId: string, callback: AsyncCallback&lt;SaveSuccessResponse&gt;): void
 
 **示例：**
 
-FA模型示例
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false});
-g_object.setSessionId("123456");
-g_object.save("local", (result) => {
-    console.log("save callback");
-    console.info("save sessionId: " + result.sessionId);
-    console.info("save version: " + result.version);
-    console.info("save deviceId:  " + result.deviceId);
-});
-```
-
-Stage模型示例
 ```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false});
+let g_object;
 g_object.setSessionId("123456");
 g_object.save("local", (result) => {
-    console.log("save callback");
+    console.info("save callback");
     console.info("save sessionId: " + result.sessionId);
     console.info("save version: " + result.version);
     console.info("save deviceId:  " + result.deviceId);
@@ -640,34 +421,10 @@ save(deviceId: string): Promise&lt;SaveSuccessResponse&gt;
 import distributedObject from '@ohos.data.distributedDataObject';
 import featureAbility from '@ohos.ability.featureAbility';
 // 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context,{name:"Amy", age:18, isVis:false});
-g_object.setSessionId("123456");
-g_object.save("local").then((result) => {
-    console.log("save callback");
-    console.info("save sessionId " + result.sessionId);
-    console.info("save version " + result.version);
-    console.info("save deviceId " + result.deviceId);
-}, () => {
-    console.error("save failed");
-});
-```
-
-```js
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context,{name:"Amy", age:18, isVis:false});
+let g_object;
 g_object.setSessionId("123456");
 g_object.save("local").then((result) => {
-    console.log("save callback");
+    console.info("save callback");
     console.info("save sessionId " + result.sessionId);
     console.info("save version " + result.version);
     console.info("save deviceId " + result.deviceId);
@@ -695,55 +452,20 @@ revokeSave(callback: AsyncCallback&lt;RevokeSaveSuccessResponse&gt;): void
 
 **示例：**
 
-FA模型示例
-
 ```js
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false});
-g_object.setSessionId("123456");
-// 持久化数据
-g_object.save("local", (result) => {
-    console.log("save callback");
-    console.info("save sessionId " + result.sessionId);
-    console.info("save version " + result.version);
-    console.info("save deviceId " + result.deviceId);
-});
-// 删除持久化保存的数据
-g_object.revokeSave((result) => {
-  console.log("revokeSave callback");
-  console.log("revokeSave sessionId " + result.sessionId);
-});
-```
-
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage) {
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false});
+let g_object;
 g_object.setSessionId("123456");
 // 持久化数据
 g_object.save("local", (result) => {
-    console.log("save callback");
+    console.info("save callback");
     console.info("save sessionId " + result.sessionId);
     console.info("save version " + result.version);
     console.info("save deviceId " + result.deviceId);
 });
 // 删除持久化保存的数据
 g_object.revokeSave((result) => {
-  console.log("revokeSave callback");
-  console.log("revokeSave sessionId " + result.sessionId);
+  console.info("revokeSave callback");
+  console.info("revokeSave sessionId " + result.sessionId);
 });
 ```
 
@@ -769,58 +491,21 @@ revokeSave(): Promise&lt;RevokeSaveSuccessResponse&gt;
 FA模型示例
 
 ```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import featureAbility from '@ohos.ability.featureAbility';
-// 获取context
-let context = featureAbility.getContext();
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false});
+let g_object;
 g_object.setSessionId("123456");
 // 持久化数据
 g_object.save("local").then((result) => {
-    console.log("save callback");
-    console.info("save sessionId " + result.sessionId);
-    console.info("save version " + result.version);
-    console.info("save deviceId " + result.deviceId);
-}, () => {
-    console.error("save failed");
-});
-// 删除持久化保存的数据
-g_object.revokeSave().then((result) => {
-    console.log("revokeSave callback");
-    console.log("sessionId" + result.sessionId);
-}, () => {
-    console.error("revokeSave failed");
-});
-```
-
-Stage模型示例
-
-```ts
-import distributedObject from '@ohos.data.distributedDataObject';
-import UIAbility from '@ohos.app.ability.UIAbility';
-
-// 获取context
-let context;
-class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage) {
-        context = this.context
-    }
-}
-let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:false});
-g_object.setSessionId("123456");
-g_object.save("local").then((result) => {
-    console.log("save callback");
+    console.info("save callback");
     console.info("save sessionId " + result.sessionId);
     console.info("save version " + result.version);
     console.info("save deviceId " + result.deviceId);
 }, () => {
     console.error("save failed");
 });
-
 // 删除持久化保存的数据
 g_object.revokeSave().then((result) => {
-    console.log("revokeSave callback");
-    console.log("sessionId" + result.sessionId);
+    console.info("revokeSave callback");
+    console.info("sessionId" + result.sessionId);
 }, () => {
     console.error("revokeSave failed");
 });
@@ -861,7 +546,7 @@ let g_object = distributedObject.createDistributedObject({name:"Amy", age:18, is
 
 ## DistributedObject<sup>(deprecated)</sup>
 
-表示一个分布式数据对象。
+表示一个分布式数据对象。在使用以下接口前，需调用[createDistributedObject()](#distributedobjectcreatedistributedobjectdeprecated)获取DistributedObject对象。
 
 ### setSessionId<sup>(deprecated)</sup>
 
diff --git a/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md b/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md
index b4b9fcf9505809908638d14865765a8eb316fe68..5320d1dde02a3b85b9bd644dbe92b42b86436ce1 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md
@@ -68,29 +68,25 @@ try {
 Stage模型示例：
 
 ```ts
-// 获取context
 import UIAbility from '@ohos.app.ability.UIAbility';
 
-let context = null;
+let preferences = null;
 
 class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context;
+    onWindowStageCreate(windowStage) {
+        try {
+            data_preferences.getPreferences(this.context, 'mystore', function (err, val) {
+                if (err) {
+                    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                    return;
+                }
+                console.info("Succeeded in getting preferences.");
+            })
+        } catch (err) {
+            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+        }
     }
 }
-
-let preferences = null;
-try {
-    data_preferences.getPreferences(context, 'mystore', function (err, val) {
-	    if (err) {
-	        console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
-	        return;
-	    }
-	    console.info("Succeeded in getting preferences.");
-	})
-} catch (err) {
-	console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
-}
 ```
 
 ## data_preferences.getPreferences
@@ -130,39 +126,35 @@ try {
         preferences = object;
         console.info("Succeeded in getting preferences.");
     }).catch((err) => {
-        console.log("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+        console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.log("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
 Stage模型示例：
 
 ```ts
-// 获取context
 import UIAbility from '@ohos.app.ability.UIAbility';
 
-let context = null;
+let preferences = null;
 
 class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context;
+    onWindowStageCreate(windowStage) {
+        try {
+            let promise = data_preferences.getPreferences(this.context, 'mystore');
+            promise.then((object) => {
+                preferences = object;
+                console.info("Succeeded in getting preferences.");
+            }).catch((err) => {
+                console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            })
+        } catch(err) {
+            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+        }
     }
 }
-
-let preferences = null;
-try {
-    let promise = data_preferences.getPreferences(context, 'mystore');
-    promise.then((object) => {
-        preferences = object;
-        console.info("Succeeded in getting preferences.");
-    }).catch((err) => {
-        console.log("Failed to get preferences. code =" + err.code + ", message =" + err.message);
-    })
-} catch(err) {
-    console.log("Failed to get preferences. code =" + err.code + ", message =" + err.message);
-}
 ```
 
 ## data_preferences.deletePreferences
@@ -218,27 +210,22 @@ try {
 Stage模型示例：
 
 ```ts
-// 获取context
 import UIAbility from '@ohos.app.ability.UIAbility';
 
-let context = null;
-
 class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context;
-    }
-}
-
-try {
-    data_preferences.deletePreferences(context, 'mystore', function (err, val) {
-        if (err) {
+    onWindowStageCreate(windowStage) {
+        try {
+            data_preferences.deletePreferences(this.context, 'mystore', function (err, val) {
+                if (err) {
+                    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+                    return;
+                }
+                console.info("Succeeded in deleting preferences." );
+            })
+        } catch (err) {
             console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
-            return;
         }
-        console.info("Succeeded in deleting preferences." );
-    })
-} catch (err) {
-    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+    }
 }
 ```
 
@@ -299,27 +286,22 @@ try {
 Stage模型示例：
 
 ```ts
-// 获取context
 import UIAbility from '@ohos.app.ability.UIAbility';
 
-let context = null;
-
 class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context;
+    onWindowStageCreate(windowStage) {
+        try{
+            let promise = data_preferences.deletePreferences(this.context, 'mystore');
+            promise.then(() => {
+                console.info("Succeeded in deleting preferences.");
+            }).catch((err) => {
+                console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            })
+        } catch(err) {
+            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+        }
     }
 }
-
-try{
-    let promise = data_preferences.deletePreferences(context, 'mystore');
-    promise.then(() => {
-        console.info("Succeeded in deleting preferences.");
-    }).catch((err) => {
-        console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
-    })
-} catch(err) {
-    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
-}
 ```
 
 ## data_preferences.removePreferencesFromCache
@@ -365,27 +347,22 @@ try {
 Stage模型示例：
 
 ```ts
-// 获取context
 import UIAbility from '@ohos.app.ability.UIAbility';
 
-let context = null;
-
 class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context;
-    }
-}
-
-try {
-    data_preferences.removePreferencesFromCache(context, 'mystore', function (err, val) {
-        if (err) {
+    onWindowStageCreate(windowStage) {
+        try {
+            data_preferences.removePreferencesFromCache(this.context, 'mystore', function (err, val) {
+                if (err) {
+                    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                    return;
+                }
+                console.info("Succeeded in removing preferences.");
+            })
+        } catch (err) {
             console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
-            return;
         }
-        console.info("Succeeded in removing preferences.");
-    })
-} catch (err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+    }
 }
 
 ```
@@ -437,25 +414,22 @@ try {
 Stage模型示例：
 
 ```ts
-// 获取context
 import UIAbility from '@ohos.app.ability.UIAbility';
-let context = null;
+
 class EntryAbility extends UIAbility {
-    onWindowStageCreate(windowStage){
-        context = this.context;
+    onWindowStageCreate(windowStage) {
+        try {
+            let promise = data_preferences.removePreferencesFromCache(this.context, 'mystore');
+            promise.then(() => {
+                console.info("Succeeded in removing preferences.");
+            }).catch((err) => {
+                console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            })
+        } catch(err) {
+            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+        }
     }
 }
-
-try {
-    let promise = data_preferences.removePreferencesFromCache(context, 'mystore');
-	promise.then(() => {
-    	console.info("Succeeded in removing preferences.");
-    }).catch((err) => {
-        console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
-    })
-} catch(err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
-}
 ```
 
 ## Preferences
@@ -804,10 +778,10 @@ try {
 	promise.then(() => {
         console.info("Succeeded in deleting the key 'startup'.");
     }).catch((err) => {
-        console.log("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
+        console.info("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
     })
 } catch(err) {
-    console.log("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
+    console.info("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
 }
 ```