updated docs

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

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

@@ -968,7 +968,7 @@ close(fd: number, callback: AsyncCallback<void>): void
 
 Closes this file asset. This API uses an asynchronous callback to return the result.
 
-**Required permissions**: ohos.permission.READ_MEDIA ('r' enabled) and ohos.permission.WRITE_MEDIA ('w' enabled)
+**Required permissions**: ohos.permission.READ_MEDIA (when **mode** is set to **r**) and ohos.permission.WRITE_MEDIA (when **mode** is set to **w**)
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
 
@@ -1009,7 +1009,7 @@ close(fd: number): Promise<void>
 
 Closes this file asset. This API uses a promise to return the result.
 
-**Required permissions**: ohos.permission.READ_MEDIA ('r' enabled) and ohos.permission.WRITE_MEDIA ('w' enabled)
+**Required permissions**: ohos.permission.READ_MEDIA (when **mode** is set to **r**) and ohos.permission.WRITE_MEDIA (when **mode** is set to **w**)
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
 
@@ -2128,7 +2128,7 @@ Enumerates media types.
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
 
-| Name | Default Value | Description|
+| Name | Default Value| Description|
 | ----- | ------ | ---- |
 | FILE  | 1      | File.|
 | IMAGE | 3      | Image.|
@@ -2169,7 +2169,7 @@ Enumerates directory types.
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
 
-| Name         | Default Value | Description              |
+| Name         | Default Value| Description              |
 | ------------- | ------ | ------------------ |
 | DIR_CAMERA    | 0      | Directory of camera files.|
 | DIR_VIDEO     | 1      | Directory of video files.      |
@@ -2184,7 +2184,7 @@ Enumerates device types.
 
 **System capability**: SystemCapability.Multimedia.MediaLibrary.Core
 
-| Name        | Default Value | Description      |
+| Name        | Default Value| Description      |
 | ------------ | ------ | ---------- |
 | TYPE_UNKNOWN | 0      | Unknown.|
 | TYPE_LAPTOP  | 1      | Laptop.|

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

+# Media Query
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif)**NOTE**
+> The APIs of this module are supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.
+
+
+## Modules to Import
+
+```
+import mediaquery from '@ohos.mediaquery'
+```
+
+
+## Required Permissions
+
+None.
+
+
+## mediaquery.matchMediaSync
+
+matchMediaSync(condition: string): MediaQueryListener
+
+Sets the media query criteria and returns the corresponding listening handle.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | condition | string | Yes| Matching condition of a media event.| 
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | MediaQueryListener | Listening handle to a media event, which is used to register or unregister the listening callback.| 
+
+- Example
+  ```
+  listener = mediaquery.matchMediaSync('(orientation: landscape)'); // Listen for landscape events.
+  ```
+
+
+## MediaQueryListener
+
+Media query handle, including the first query result when the handle is applied for.
+
+
+### Attributes
+
+| Name| Type| Readable| Writable| Description| 
+| -------- | -------- | -------- | -------- | -------- |
+| matches | boolean | Yes| No| Whether the match condition is met.| 
+| media | string | Yes| No| Matching condition of a media event.| 
+
+
+### on
+
+on(type: 'change', callback: Callback<MediaQueryResult>): void
+
+Registers a callback with the corresponding query condition by using the handle. This callback is triggered when the media attributes change.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | type | string | Yes| Must enter the string **change**.| 
+  | callback | Callback<MediaQueryResult> | Yes| Callback registered with media query.| 
+
+- Example
+  For details, see [off Example](#off).
+
+
+### off
+
+off(type: 'change', callback?: Callback<MediaQueryResult>): void
+
+Unregisters a callback with the corresponding query condition by using the handle, so that no callback is triggered when the media attributes change.
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | type | boolean | Yes| Must enter the string **change**.| 
+  | callback | Callback<MediaQueryResult> | No| Callback to be unregistered. If the default value is used, all callbacks of the handle are unregistered.| 
+
+- Example
+  ```
+    import mediaquery from '@ohos.mediaquery'
+    
+    listener = mediaquery.matchMediaSync('(orientation: landscape)'); // Listen for landscape events.
+    function onPortrait(mediaQueryResult) {
+        if (mediaQueryResult.matches) {
+            // do something here
+        } else {
+            // do something here
+        }
+    }
+    this.listener.on('change', this.onPortrait) // Registration callback.
+    this.listener.off('change', this.onPortrait) // Deregistration callback.
+  ```
+
+
+## MediaQueryResult
+
+
+### Attributes
+
+| Name| Type| Readable| Writable| Description| 
+| -------- | -------- | -------- | -------- | -------- |
+| matches | boolean | Yes| No| Whether the match condition is met.| 
+| media | string | Yes| No| Matching condition of a media event.| 
+
+
+### Example
+
+```
+import mediaquery from '@ohos.mediaquery'
+
+let portraitFunc = null
+
+@Entry
+@Component
+struct MediaQueryExample {
+  @State color: string = '#DB7093'
+  @State text: string = 'Portrait'
+  listener = mediaquery.matchMediaSync('(orientation: landscape)')
+
+  onPortrait(mediaQueryResult) {
+    if (mediaQueryResult.matches) {
+      this.color = '#FFD700'
+      this.text = 'Landscape'
+    } else {
+      this.color = '#DB7093'
+      this.text = 'Portrait'
+    }
+  }
+
+  aboutToAppear() {
+    portraitFunc = this.onPortrait.bind(this) //bind current js instance
+    this.listener.on('change', portraitFunc)
+  }
+
+  build() {
+    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
+      Text(this.text).fontSize(24).fontColor(this.color)
+    }
+    .width('100%').height('100%')
+  }
+}
+```