!18607 增加FA模式下得pathDir获取

Merge pull request !18607 from lvyuanyuan/myfeature

zh-cn/application-dev/reference/apis/js-apis-file-fileuri.md

@@ -14,6 +14,8 @@ import fileuri from "@ohos.file.fileuri";
 
 使用该功能模块前，需要先获取其应用沙箱路径，开发示例如下：
 
+**Stage模型**
+
  ```js
 import UIAbility from '@ohos.app.ability.UIAbility';
 
@@ -25,6 +27,19 @@ export default class EntryAbility extends UIAbility {
 }
  ```
 
+**FA模型**
+
+ ```js
+ import featureAbility from '@ohos.ability.featureAbility';
+ 
+ let context = featureAbility.getContext();
+ context.getFilesDir().then((data) => {
+      let pathDir = data;
+ })
+ ```
+
+FA模型context的具体获取方法参见[FA模型](js-apis-inner-app-context.md#Context模块)。
+
 ## fileUri.getUriFromPath
 
 getUriFromPath(path: string): string