update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/reference/apis/js-apis-medialibrary.md

@@ -20,6 +20,7 @@ Obtains a **MediaLibrary** instance, which is used to access and modify personal
 This API can be used only in the stage model.
 
 > **NOTE**
+>
 > This API is deprecated since API version 9. Use [getPhotoAccessHelper](js-apis-photoAccessHelper.md#photoaccesshelpergetphotoaccesshelper) instead.
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
@@ -44,7 +45,7 @@ const context = getContext(this);
 let media = mediaLibrary.getMediaLibrary(context);
 ```
 
-**Example (API version 8)**
+**Example (from API version 8)**
 
 ```js
 import featureAbility from '@ohos.ability.featureAbility';
@@ -62,6 +63,7 @@ Obtains a **MediaLibrary** instance, which is used to access and modify personal
 This API can be used only in the FA model.
 
 > **NOTE**
+>
 > This API is deprecated since API version 9. There is no substitute API.
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
@@ -344,7 +346,7 @@ Creates a media asset. This API uses a promise to return the result.
 | ------------ | ------------------------ | ---- | ------------------------------------------------------------ |
 | mediaType    | [MediaType](#mediatype8) | Yes  | Media type.                                                    |
 | displayName  | string                   | Yes  | File name to display.                                                  |
-| relativePath | string                   | Yes  | Relative path of the file, which can be obtained by [getPublicDirectory](#getpublicdirectory8).|
+| relativePath | string                   | Yes  | Relative path of the file, which can be obtained by **getPublicDirectory**.|
 
 **Return value**
 
@@ -557,7 +559,7 @@ Obtains albums. This API uses an asynchronous callback to return the result.
 > **NOTE**
 >
 > - This API is deprecated since API version 9. Use [getAlbums](js-apis-photoAccessHelper.md#getalbums) instead.
-> - From the SDK of API version 10, **relativePath** is no longer associated with an album. Therefore, **relativePath** cannot be used as a search criterion in **getAlbums**. Currently, only **Camera** and **ScreenShots** albums are supported. For more details, see [changelogs-mediaLibrary.md](../../../release-notes/changelogs/OpenHarmony_4.0.8.2/changelogs-mediaLibrary.md).
+> - From the SDK of API version 10, **relativePath** is no longer associated with an album. Therefore, **relativePath** cannot be used as a search criterion in **getAlbums**. Currently, only **Camera** and **ScreenShots** albums are supported. For details, see [changelogs-mediaLibrary.md](../../../release-notes/changelogs/OpenHarmony_4.0.8.2/changelogs-mediaLibrary.md).
 
 **Required permissions**: ohos.permission.READ_MEDIA
 
@@ -597,7 +599,7 @@ Obtains albums. This API uses a promise to return the result.
 > **NOTE**
 >
 > - This API is deprecated since API version 9. Use [getAlbums](js-apis-photoAccessHelper.md#getalbums-2) instead.
-> - From the SDK of API version 10, **relativePath** is no longer associated with an album. Therefore, **relativePath** cannot be used as a search criterion in **getAlbums**. Currently, only **Camera** and **ScreenShots** albums are supported. For more details, see [changelogs-mediaLibrary.md](../../../release-notes/changelogs/OpenHarmony_4.0.8.2/changelogs-mediaLibrary.md).
+> - From the SDK of API version 10, **relativePath** is no longer associated with an album. Therefore, **relativePath** cannot be used as a search criterion in **getAlbums**. Currently, only **Camera** and **ScreenShots** albums are supported. For details, see [changelogs-mediaLibrary.md](../../../release-notes/changelogs/OpenHarmony_4.0.8.2/changelogs-mediaLibrary.md).
 
 **Required permissions**: ohos.permission.READ_MEDIA
 
@@ -666,6 +668,7 @@ Releases this **MediaLibrary** instance.
 Call this API when you no longer need to use the APIs in the **MediaLibrary** instance.
 
 > **NOTE**
+>
 > This API is deprecated since API version 9. Use [release](js-apis-photoAccessHelper.md#release-1) instead.
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core

en/application-dev/reference/apis/js-apis-userFileManager.md

@@ -1433,37 +1433,35 @@ For details about the error codes, see [Universal Error Codes](../errorcodes/err
 import dataSharePredicates from '@ohos.data.dataSharePredicates';
 
 async function example() {
-  console.info('getPhotoIndexDemo');
-  let predicatesForGetAsset = new dataSharePredicates.DataSharePredicates();
-  let fetchOp = {
-    fetchColumns: [],
-    predicates: predicatesForGetAsset
-  };
-  //Obtain the uri of the album
-  let albumFetchResult = await mgr.getAlbums(userFileManager.AlbumType.SYSTEM, userFileManager.AlbumSubtype.FAVORITE, fetchOp);
-  let album = await albumFetchResult.getFirstObject();
-
-  let predicates = new dataSharePredicates.DataSharePredicates();
-  predicates.orderByAsc("add_modified");
-  let fetchOptions = {
-    fetchColumns: [],
-    predicates: predicates
-  };
-  let photoFetchResult = await album.getPhotoAssets(fetchOptions);
-  let expectIndex = 1;
-  //Obtain the uri of the second file
-  let photoAsset = await photoFetchResult.getPositionObject(expectIndex);
-
-  mgr.getPhotoIndex(photoAsset.uri, album.albumUri, fetchOptions, (err, index) => {
-    try {
+  try {
+    console.info('getPhotoIndexDemo');
+    let predicatesForGetAsset = new dataSharePredicates.DataSharePredicates();
+    let fetchOp = {
+      fetchColumns: [],
+      predicates: predicatesForGetAsset
+    };
+    // Obtain the uri of the album
+    let albumFetchResult = await mgr.getAlbums(userFileManager.AlbumType.SYSTEM, userFileManager.AlbumSubType.FAVORITE, fetchOp);
+    let album = await albumFetchResult.getFirstObject();
+    let predicates = new dataSharePredicates.DataSharePredicates();
+    predicates.orderByAsc(userFileManager.ImageVideoKey.DATE_MODIFIED);
+    let fetchOptions = {
+      fetchColumns: [userFileManager.ImageVideoKey.DATE_MODIFIED],
+      predicates: predicates
+    };
+    let photoFetchResult = await album.getPhotoAssets(fetchOptions);
+    let expectIndex = 1;
+    // Obtain the uri of the second file
+    let photoAsset = await photoFetchResult.getPositionObject(expectIndex);
+    mgr.getPhotoIndex(photoAsset.uri, album.albumUri, fetchOptions, (err, index) => {
       if (err == undefined) {
         console.info(`getPhotoIndex successfully and index is : ${index}`);
       } else {
         console.info(`getPhotoIndex failed;`);
       }
-    } catch (error) {
-      console.info(`getPhotoIndex failed; error: ${error}`);
-    }
+    });
+  } catch (error) {
+    console.info(`getPhotoIndex failed; error: ${error}`);
   }
 }
 ```
@@ -1508,33 +1506,34 @@ For details about the error codes, see [Universal Error Codes](../errorcodes/err
 import dataSharePredicates from '@ohos.data.dataSharePredicates';
 
 async function example() {
-  console.info('getPhotoIndexDemo');
-  let predicatesForGetAsset = new dataSharePredicates.DataSharePredicates();
-  let fetchOp = {
-    fetchColumns: [],
-    predicates: predicatesForGetAsset
-  };
-  //Obtain the uri of the album
-  let albumFetchResult = await mgr.getAlbums(userFileManager.AlbumType.SYSTEM, userFileManager.AlbumSubtype.FAVORITE, fetchOp);
-  let album = await albumFetchResult.getFirstObject();
-
-  let predicates = new dataSharePredicates.DataSharePredicates();
-  predicates.orderByAsc("add_modified");
-  let fetchOptions = {
-    fetchColumns: [],
-    predicates: predicates
-  };
-  let photoFetchResult = await album.getPhotoAssets(fetchOptions);
-  let expectIndex = 1;
-  //Obtain the uri of the second file
-  let photoAsset = await photoFetchResult.getPositionObject(expectIndex);
-
-  mgr.getPhotoIndex(photoAsset.uri, album.albumUri, fetchOptions)
-    .then((index) => {
-        console.info(`getPhotoIndex successfully and index is : ${index}`);
-      }).catch((err) => {
+  try {
+    console.info('getPhotoIndexDemo');
+    let predicatesForGetAsset = new dataSharePredicates.DataSharePredicates();
+    let fetchOp = {
+      fetchColumns: [],
+      predicates: predicatesForGetAsset
+    };
+    // Obtain the uri of the album
+    let albumFetchResult = await mgr.getAlbums(userFileManager.AlbumType.SYSTEM, userFileManager.AlbumSubType.FAVORITE, fetchOp);
+    let album = await albumFetchResult.getFirstObject();
+    let predicates = new dataSharePredicates.DataSharePredicates();
+    predicates.orderByAsc(userFileManager.ImageVideoKey.DATE_MODIFIED);
+    let fetchOptions = {
+      fetchColumns: [userFileManager.ImageVideoKey.DATE_MODIFIED],
+      predicates: predicates
+    };
+    let photoFetchResult = await album.getPhotoAssets(fetchOptions);
+    let expectIndex = 1;
+    // Obtain the uri of the second file
+    let photoAsset = await photoFetchResult.getPositionObject(expectIndex);
+    mgr.getPhotoIndex(photoAsset.uri, album.albumUri, fetchOptions).then((index) => {
+      console.info(`getPhotoIndex successfully and index is : ${index}`);
+    }).catch((err) => {
       console.info(`getPhotoIndex failed; error: ${err}`);
-    })
+    });
+  } catch (error) {
+    console.info(`getPhotoIndex failed; error: ${error}`);
+  }
 }
 ```
 
@@ -2565,15 +2564,18 @@ async function example() {
   try {
     console.info('getExifDemo');
     let predicates = new dataSharePredicates.DataSharePredicates();
+    predicates.isNotNull('all_exif') 
     let fetchOptions = {
-      fetchColumns: [ 'all_exif',  ImageVideoKey.USER_COMMENT],
+      fetchColumns: ['all_exif', userFileManager.ImageVideoKey.USER_COMMENT],
       predicates: predicates
     };
     let fetchResult = await mgr.getPhotoAssets(fetchOptions);
     let fileAsset = await fetchResult.getFirstObject();
+    console.info('getExifDemo fileAsset displayName: ' + JSON.stringify(fileAsset.displayName));
     let exifMessage = await fileAsset.getExif();
     let userCommentKey = 'UserComment';
     let userComment = JSON.stringify(JSON.parse(exifMessage), [userCommentKey]);
+    console.info('getExifDemo userComment: ' + JSON.stringify(userComment));
     fetchResult.close();
   } catch (err) {
     console.error('getExifDemoCallback failed with error: ' + err);
@@ -2651,16 +2653,19 @@ async function example() {
   try {
     console.info('getExifDemo');
     let predicates = new dataSharePredicates.DataSharePredicates();
+    predicates.isNotNull('all_exif')
     let fetchOptions = {
-      fetchColumns: [ 'all_exif',  ImageVideoKey.USER_COMMENT],
+      fetchColumns: ['all_exif', userFileManager.ImageVideoKey.USER_COMMENT],
       predicates: predicates
     };
     let fetchResult = await mgr.getPhotoAssets(fetchOptions);
     let fileAsset = await fetchResult.getFirstObject();
+    console.info('getExifDemo fileAsset displayName: ' + JSON.stringify(fileAsset.displayName));
     let userCommentKey = 'UserComment';
     fileAsset.getExif((err, exifMessage) => {
       if (exifMessage != undefined) {
         let userComment = JSON.stringify(JSON.parse(exifMessage), [userCommentKey]);
+        console.info('getExifDemo userComment: ' + JSON.stringify(userComment));
       } else {
         console.error('getExif failed, message = ', err);
       }