fix white space problem

Signed-off-by: Nzhangxin_T <zhangxin312@huawei.com>

zh-cn/application-dev/background-task-management/background-task-dev-guide.md

@@ -34,34 +34,34 @@ import backgroundTaskManager from '@ohos.backgroundTaskManager';
 
 1. 申请延迟挂起
 
-```js
-import backgroundTaskManager from '@ohos.backgroundTaskManager';
+    ```js
+    import backgroundTaskManager from '@ohos.backgroundTaskManager';
 
-let myReason = 'test requestSuspendDelay';
-let delayInfo = backgroundTaskManager.requestSuspendDelay(myReason, () => {
-    console.info("Request suspension delay will time out.");
-});
+    let myReason = 'test requestSuspendDelay';
+    let delayInfo = backgroundTaskManager.requestSuspendDelay(myReason, () => {
+        console.info("Request suspension delay will time out.");
+    });
 
-var id = delayInfo.requestId;console.info("requestId is: " + id);
-```
+    var id = delayInfo.requestId;console.info("requestId is: " + id);
+    ```
 
 
 2. 获取进入挂起前的剩余时间
 
-```js
-backgroundTaskManager.getRemainingDelayTime(id).then( res => {
-    console.log('promise => Operation succeeded. Data: ' + JSON.stringify(res));
-}).catch( err => {
-    console.log('promise => Operation failed. Cause: ' + err.data);
-});
-```
+    ```js
+    backgroundTaskManager.getRemainingDelayTime(id).then( res => {
+        console.log('promise => Operation succeeded. Data: ' + JSON.stringify(res));
+    }).catch( err => {
+        console.log('promise => Operation failed. Cause: ' + err.data);
+    });
+    ```
 
 
 3. 取消延迟挂起
 
-```js
-backgroundTaskManager.cancelSuspendDelay(id);
-```
+    ```js
+    backgroundTaskManager.cancelSuspendDelay(id);
+    ```
 
 
 ## 开发实例
@@ -127,67 +127,67 @@ ohos.permission.KEEP_BACKGROUND_RUNNING
 
 1. 在config.json文件中配置长时任务权限
 
-```json
-"module": {
-  "package": "com.example.myapplication",
-  ...,
-  "reqPermissions": [
-    {
-      "name": "ohos.permission.KEEP_BACKGROUND_RUNNING"
+    ```json
+    "module": {
+        "package": "com.example.myapplication",
+        ...,
+        "reqPermissions": [
+            {
+            "name": "ohos.permission.KEEP_BACKGROUND_RUNNING"
+            }
+        ]
     }
-  ]
-}
-```
+    ```
 
-1. 申请长时任务
+2. 申请长时任务
 
-```js
-import backgroundTaskManager from '@ohos.backgroundTaskManager';
-import featureAbility from '@ohos.ability.featureAbility';
-import wantAgent from '@ohos.wantAgent';
+    ```js
+    import backgroundTaskManager from '@ohos.backgroundTaskManager';
+    import featureAbility from '@ohos.ability.featureAbility';
+    import wantAgent from '@ohos.wantAgent';
 
-let wantAgentInfo = {
-    wants: [
-        {
-            bundleName: "com.example.myapplication",
-            abilityName: "com.example.myapplication.MainAbility"
-        }
-    ],
-    operationType: wantAgent.OperationType.START_ABILITY,
-    requestCode: 0,
-    wantAgentFlags: [wantAgent.WantAgentFlags.UPDATE_PRESET_FLAG]
-};
+    let wantAgentInfo = {
+        wants: [
+            {
+                bundleName: "com.example.myapplication",
+                abilityName: "com.example.myapplication.MainAbility"
+            }
+        ],
+        operationType: wantAgent.OperationType.START_ABILITY,
+        requestCode: 0,
+        wantAgentFlags: [wantAgent.WantAgentFlags.UPDATE_PRESET_FLAG]
+    };
 
-// 通过wantAgent模块的getWantAgent方法获取WantAgent对象
-wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj) => {
-    backgroundTaskManager.startBackgroundRunning(featureAbility.getContext(),
-        backgroundTaskManager.BackgroundMode.DATA_TRANSFER, wantAgentObj).then(() => {
-        console.info("Operation succeeded");
-    }).catch((err) => {
-        console.error("Operation failed Cause: " + err);
+    // 通过wantAgent模块的getWantAgent方法获取WantAgent对象
+    wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj) => {
+        backgroundTaskManager.startBackgroundRunning(featureAbility.getContext(),
+            backgroundTaskManager.BackgroundMode.DATA_TRANSFER, wantAgentObj).then(() => {
+            console.info("Operation succeeded");
+        }).catch((err) => {
+            console.error("Operation failed Cause: " + err);
+        });
     });
-});
-
-```
+    ```
 
-2. 停止长时任务
+3. 停止长时任务
 
-```js
-import backgroundTaskManager from '@ohos.backgroundTaskManager';
-import featureAbility from '@ohos.ability.featureAbility';
+    ```js
+    import backgroundTaskManager from '@ohos.backgroundTaskManager';
+    import featureAbility from '@ohos.ability.featureAbility';
 
-backgroundTaskManager.stopBackgroundRunning(featureAbility.getContext()).then(() => {
-    console.info("Operation succeeded");
-}).catch((err) => {
-    console.error("Operation failed Cause: " + err);
-});
+    backgroundTaskManager.stopBackgroundRunning(featureAbility.getContext()).then(() => {
+        console.info("Operation succeeded");
+    }).catch((err) => {
+        console.error("Operation failed Cause: " + err);
+    });
 
-```
+    ```
 
 ## 开发实例
 
 当服务启动后，在serviceAbility的onStart回调方法中，调用长时任务的申请接口，声明此服务需要在后台长时运行。在onStop回调方法里，调用长时任务取消接口，声明取消长时任务。
-在service.js文件中：
+在service.js文件中:
+
 ```js
 import backgroundTaskManager from '@ohos.backgroundTaskManager';
 import featureAbility from '@ohos.ability.featureAbility';

zh-cn/application-dev/background-task-management/background-task-overview.md

@@ -59,4 +59,4 @@ OpenHarmony提供了九种后台模式，供需要在后台做长时任务的业
 - 如果任务结束，应用应主动退出后台模式。若在后台运行期间，系统检测到应用并未使用对应后台模式的资源，则会被挂起（Suspend）。
 - 避免不合理地申请后台长时任务，长时任务类型要与应用的业务类型匹配。如表1所示。如果执行的任务和申请的类型不匹配，也会被系统检测到并被挂起（Suspend）。
 - 长时任务是为了真正在后台长时间执行某个任务，如果一个应用申请了长时任务，但在实际运行过程中，并未真正运行或执行此类任务时，也会被系统检测到并被挂起（Suspend）。
-- 每个元能力同一时刻只能申请运行一个长时任务。
+- 每个Ability同一时刻只能申请运行一个长时任务。
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