fix sample code problems in accessibility docs

Signed-off-by: Nzaki <zhoujun141@huawei.com>
Change-Id: Idf1970f0033252f02cb403a52551fad072594c20

zh-cn/application-dev/reference/apis/js-apis-accessibility-config.md

@@ -64,6 +64,7 @@ enableAbility(name: string, capability: Array<accessibility.Capability>):
 **示例：**
 
 ```ts
+import accessibility from '@ohos.accessibility';
 let name = 'com.ohos.example/axExtension';
 let capability : accessibility.Capability[] = ['retrieve'];
 try {
@@ -105,6 +106,7 @@ enableAbility(name: string, capability: Array<accessibility.Capability>, c
 **示例：**
 
 ```ts
+import accessibility from '@ohos.accessibility';
 let name = 'com.ohos.example/axExtension';
 let capability : accessibility.Capability[] = ['retrieve'];
 try {

zh-cn/application-dev/reference/apis/js-apis-accessibility-extension-context.md

@@ -210,6 +210,7 @@ getFocusElement(callback: AsyncCallback\<AccessibilityElement>): void;
 **示例：**
 
 ```ts
+let focusElement;
 try {
     axContext.getFocusElement((err, data) => {
         if (err) {
@@ -242,6 +243,7 @@ getFocusElement(isAccessibilityFocus: boolean, callback: AsyncCallback\<Accessib
 **示例：**
 
 ```ts
+let focusElement;
 try {
     axContext.getFocusElement(isAccessibilityFocus, (err, data) => {
     if (err) {
@@ -324,6 +326,7 @@ getWindowRootElement(callback: AsyncCallback\<AccessibilityElement>): void;
 **示例：**
 
 ```ts
+let rootElement;
 try {
     axContext.getWindowRootElement((err, data) => {
     if (err) {
@@ -364,6 +367,7 @@ getWindowRootElement(windowId: number, callback: AsyncCallback\<AccessibilityEle
 **示例：**
 
 ```ts
+let rootElement;
 try {
     axContext.getWindowRootElement(windowId, (err, data) => {
     if (err) {
@@ -536,10 +540,11 @@ injectGesture(gesturePath: GesturePath): Promise\<void>;
 
 ```ts
 import GesturePath from "@ohos.accessibility.GesturePath";
-let gesturePath = new GesturePath(100);
+import GesturePoint from '@ohos.accessibility.GesturePoint';
+let gesturePath = new GesturePath.GesturePath(100);
 try {
     for (let i = 0; i < 10; i++) {
-        let gesturePoint = new GesturePoint(100, i * 200);
+        let gesturePoint = new GesturePoint.GesturePoint(100, i * 200);
         gesturePath.points.push(gesturePoint);
     }
     axContext.injectGesture(gesturePath).then(() => {
@@ -578,10 +583,11 @@ injectGesture(gesturePath: GesturePath, callback: AsyncCallback\<void>): void
 
 ```ts
 import GesturePath from "@ohos.accessibility.GesturePath";
-let gesturePath = new GesturePath(100);
+import GesturePoint from '@ohos.accessibility.GesturePoint';
+let gesturePath = new GesturePath.GesturePath(100);
 try {
     for (let i = 0; i < 10; i++) {
-        let gesturePoint = new GesturePoint(100, i * 200);
+        let gesturePoint = new GesturePoint.GesturePoint(100, i * 200);
         gesturePath.points.push(gesturePoint);
     }
     axContext.injectGesture(gesturePath, (err, data) => {
@@ -687,6 +693,8 @@ attributeValue\<T extends keyof ElementAttributeValues>(attributeName: T): Promi
 
 ```ts
 let attributeName = 'name';
+let attributeValue;
+let rootElement;
 try {
     rootElement.attributeValue(attributeName).then((data) => {
         console.log('get attribute value by name success');