示例代码缩进2空格；if(err!==undefined)等直接改为if(err)即可

Signed-off-by: NHollokin <taoyuxin2@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-inputmethod-extension-ability.md

@@ -38,9 +38,9 @@ Extension生命周期回调，在拉起Extension输入法应用时调用，执
 
 ```js
 class InputMethodExt extends InputMethodExtensionAbility {
-    onCreate(want) {
-        console.log('onCreate, want:' + want.abilityName);
-    }
+  onCreate(want) {
+    console.log('onCreate, want:' + want.abilityName);
+  }
 }
 ```
 
@@ -56,8 +56,8 @@ Extension生命周期回调，在销毁输入法应用时回调，执行资源
 
 ```js
 class InputMethodExt extends InputMethodExtensionAbility {
-    onDestroy() {
-        console.log('onDestroy');
-    }
+  onDestroy() {
+    console.log('onDestroy');
+  }
 }
 ```

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

@@ -21,9 +21,9 @@ import InputMethodExtensionContext from '@ohos.InputMethodExtensionContext';
 ```js
 import InputMethodExtensionAbility from '@ohos.InputMethodExtensionAbility';
 class EntryAbility extends InputMethodExtensionAbility {
-    onCreate() {
-        let context = this.context;
-    }
+  onCreate() {
+    let context = this.context;
+  }
 }
 ```
 
@@ -45,7 +45,7 @@ destroy(callback: AsyncCallback\<void>): void
 
 ```js
 this.context.destroy((err) => {
-    console.log('destroy result:' + JSON.stringify(err));
+  console.log('destroy result:' + JSON.stringify(err));
 });
 ```
 
@@ -67,8 +67,8 @@ destroy(): Promise\<void>;
 
 ```js
 this.context.destroy().then(() => {
-    console.log('Succeed in destoring context.');
+  console.log('Succeed in destoring context.');
 }).catch((error) => {
-    console.log('Failed to destory context: ' + JSON.stringify(error));
+  console.log('Failed to destory context: ' + JSON.stringify(error));
 });
 ```