Update docs against 13792

Signed-off-by: wusongqing<wusongqing@huawei.com>

en/application-dev/task-management/continuous-task-dev-guide.md

@@ -89,6 +89,7 @@ struct Index {
     };
 
     // Obtain the WantAgent object by using the getWantAgent API of the wantAgent module.
+    try {
         wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj) => {
             try {
                 backgroundTaskManager.startBackgroundRunning(this.context,
@@ -101,6 +102,9 @@ struct Index {
                 console.error(`Operation startBackgroundRunning failed. code is ${error.code} message is ${error.message}`);
             }
         });
+    } catch (error) {
+        console.error(`Operation getWantAgent failed. code is ${error.code} message is ${error.message}`);
+    }
   }
 
   stopContinuousTask() {
@@ -176,9 +180,10 @@ function startContinuousTask() {
     };
 
     // Obtain the WantAgent object by using the getWantAgent API of the wantAgent module.
+    try {
         wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj) => {
             try {
-            backgroundTaskManager.startBackgroundRunning(featureAbility.getContext(),
+                backgroundTaskManager.startBackgroundRunning(mContext,
                     backgroundTaskManager.BackgroundMode.DATA_TRANSFER, wantAgentObj).then(() => {
                     console.info("Operation startBackgroundRunning succeeded");
                 }).catch((error) => {
@@ -188,13 +193,16 @@ function startContinuousTask() {
                 console.error(`Operation startBackgroundRunning failed. code is ${error.code} message is ${error.message}`);
             }
         });
+    } catch (error) {
+        console.error(`Operation getWantAgent failed. code is ${error.code} message is ${error.message}`);
+    }
 }
 
 function stopContinuousTask() {
     try {
-        backgroundTaskManager.stopBackgroundRunning(featureAbility.getContext()).then(() => {
+        backgroundTaskManager.stopBackgroundRunning(mContext).then(() => {
             console.info("Operation stopBackgroundRunning succeeded");
-        }).catch((err) => {
+        }).catch((error) => {
             console.error(`Operation stopBackgroundRunning failed. code is ${error.code} message is ${error.message}`);
         });
     } catch (error) {
@@ -335,6 +343,7 @@ function startContinuousTask() {
     };
 
     // Obtain the WantAgent object by using the getWantAgent API of the wantAgent module.
+    try {
         wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj) => {
             try {
                 backgroundTaskManager.startBackgroundRunning(featureAbility.getContext(),
@@ -347,6 +356,9 @@ function startContinuousTask() {
                 console.error(`Operation startBackgroundRunning failed. code is ${error.code} message is ${error.message}`);
             }
         });
+    } catch (error) {
+        console.error(`Operation getWantAgent failed. code is ${error.code} message is ${error.message}`);
+    }
 }
 
 function stopContinuousTask() {
@@ -396,7 +408,7 @@ class MyStub extends rpc.RemoteObject {
 }
 
 export default {
-    onStart(want) {
+    onStart() {
         console.info('ServiceAbility onStart');
         mMyStub = new MyStub("ServiceAbility-test");
         // Call the API to start the task.
@@ -416,7 +428,7 @@ export default {
     onDisconnect() {
         console.info('ServiceAbility onDisconnect');
     },
-    onCommand(want, restart, startId) {
+    onCommand(want, startId) {
         console.info('ServiceAbility onCommand');
     }
 };