update docs against 6392

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

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

 # Page Routing
 
+The **Router** module provides APIs to access pages through URLs. You can use the APIs to navigate to a specified page in an application, replace the current page with another one in an application, and return to the previous page or a specified page.
+
 > **NOTE**
 >
 > - The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
-> - Page routing APIs can be invoked only after page rendering is complete. Do not call the APIs in **onInit** and **onReady** when the page is still in the rendering phase.
+> 
+> - Page routing APIs can be invoked only after page rendering is complete. Do not call these APIs in **onInit** and **onReady** when the page is still in the rendering phase.
 
 ## Modules to Import
 
@@ -11,10 +14,6 @@
 import router from '@ohos.router'
 ```
 
-## Required Permissions
-
-None.
-
 ## router.push
 
 push(options: RouterOptions): void
@@ -24,84 +23,98 @@ Navigates to a specified page in the application.
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
 **Parameters**
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| options | [RouterOptions](#routeroptions) | Yes| Page routing parameters.|
+| Name | Type                           | Mandatory| Description              |
+| ------- | ------------------------------- | ---- | ------------------ |
+| options | [RouterOptions](#routeroptions) | Yes  | Page routing parameters.|
 
 
 **Example**
   ```js
-  // Current page
-  export default {
-    pushPage() {
-      router.push({
-        url: 'pages/routerpage2/routerpage2',
-        params: {
-  	data1: 'message',
-          data2: {
-            data3: [123, 456, 789]
-  	},
-        },
-      });
-    }
-  }
+router.push({
+  url: 'pages/routerpage2',
+  params: {
+    data1: 'message',
+    data2: {
+      data3: [123, 456, 789]
+    },
+  },
+});
   ```
+## router.push<sup>9+</sup>
+
+push(options: RouterOptions, mode: RouterMode): void
+
+Navigates to a specified page in the application.
+
+**System capability**: SystemCapability.ArkUI.ArkUI.Full
+
+**Parameters**
+| Name           | Type                           | Mandatory| Description                |
+| ----------------- | ------------------------------- | ---- | -------------------- |
+| options           | [RouterOptions](#routeroptions) | Yes  | Page routing parameters.  |
+| mode<sup>9+</sup> | [RouterMode](#routermode9)      | Yes  | Routing mode.|
+
+
+**Example**
   ```js
-  // routerpage2 page
-  export default {
-    data: {
-      data1: 'default',
-      data2: {
-        data3: [1, 2, 3]
-      }
+router.push({
+  url: 'pages/routerpage2/routerpage2',
+  params: {
+    data1: 'message',
+    data2: {
+      data3: [123, 456, 789]
     },
-    onInit() {
-      console.info('showData1:' + this.data1);
-      console.info('showData3:' + this.data2.data3);
-    }
-  }
+  },
+},router.RouterMode.Standard);
   ```
 
-
 ## router.replace
 
-replace(options: RouterOptions): void
+replace(options: RouterOptions, mode?: RouterMode): void
 
 Replaces the current page with another one in the application and destroys the current page.
 
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
 **Parameters**
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| options | [RouterOptions](#routeroptions) | Yes| Description of the new page.|
+| Name | Type                           | Mandatory| Description              |
+| ------- | ------------------------------- | ---- | ------------------ |
+| options | [RouterOptions](#routeroptions) | Yes  | Description of the new page.|
 
 **Example**
 
   ```js
-  // Current page
-  export default {
-    replacePage() {
-      router.replace({
-        url: 'pages/detail/detail',
-        params: {
-          data1: 'message',
-        },
-      });
-    }
-  }
+router.replace({
+  url: 'pages/detail',
+  params: {
+    data1: 'message',
+  },
+});
   ```
 
+  ## router.replace<sup>9+</sup>
+
+replace(options: RouterOptions, mode: RouterMode): void
+
+Replaces the current page with another one in the application and destroys the current page.
+
+**System capability**: SystemCapability.ArkUI.ArkUI.Full
+
+**Parameters**
+| Name           | Type                           | Mandatory| Description                |
+| ----------------- | ------------------------------- | ---- | -------------------- |
+| options           | [RouterOptions](#routeroptions) | Yes  | Description of the new page.  |
+| mode<sup>9+</sup> | [RouterMode](#routermode9)      | Yes  | Routing mode.|
+
+**Example**
+
   ```js
-  // detail page
-  export default {
-    data: {
-      data1: 'default'
-    },
-    onInit() {
-      console.info('showData1:' + this.data1)
-    }
-  }
+router.replace({
+  url: 'pages/detail/detail',
+  params: {
+    data1: 'message',
+  },
+}, router.RouterMode.Standard);
   ```
 
 ## router.back
@@ -113,58 +126,14 @@ Returns to the previous page or a specified page.
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
 **Parameters**
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| options | [RouterOptions](#routeroptions) | Yes| Description of the page. The **url** parameter indicates the URL of the page to return to. If the specified page does not exist in the page stack, the application does not respond. If this parameter is not set, the application returns to the previous page.|
+| Name | Type                           | Mandatory| Description                                                        |
+| ------- | ------------------------------- | ---- | ------------------------------------------------------------ |
+| options | [RouterOptions](#routeroptions) | No  | Description of the page. The **url** parameter indicates the URL of the page to return to. If the specified page does not exist in the page stack, the application does not respond. If this parameter is not set, the application returns to the previous page.|
 
 **Example**
-  ```js
-  // index page
-  export default {    
-    indexPushPage() {        
-      router.push({            
-        url: 'pages/detail/detail',        
-      });        
-    }
-  }
-  ```
-
-  ```js
-  // detail page
-  export default {    
-    detailPushPage() {        
-      router.push({            
-        url: 'pages/mall/mall',        
-      });    
-    }
-  }
-  ```
-
-  ```js
-  // Navigate from the mall page to the detail page through router.back().
-  export default {    
-    mallBackPage() {        
-      router.back();    
-    }
-  }
-  ```
 
   ```js
-  // Navigate from the detail page to the index page through router.back().
-  export default {    
-    defaultBack() {        
-      router.back();    
-    }
-  }
-  ```
-
-  ```js
-  // Return to the detail page through router.back().
-  export default {    
-    backToDetail() {        
-      router.back({uri:'pages/detail/detail'});    
-    }
-  }
+router.back({uri:'pages/detail'});    
   ```
 
 ## router.clear
@@ -176,12 +145,9 @@ Clears all historical pages in the stack and retains only the current page at th
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
 **Example**
+
   ```js
-  export default {    
-    clearPage() {        
-      router.clear();    
-    }
-  }js
+router.clear();    
   ```
 
 ## router.getLength
@@ -193,18 +159,14 @@ Obtains the number of pages in the current stack.
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
 **Return value**
-| Type| Description|
-| -------- | -------- |
+| Type  | Description                              |
+| ------ | ---------------------------------- |
 | string | Number of pages in the stack. The maximum value is **32**.|
 
 **Example**
   ```js
-  export default {     
-    getLength() {        
-      var size = router.getLength();        
-      console.log('pages stack size = ' + size);    
-    }
-  }
+var size = router.getLength();        
+console.log('pages stack size = ' + size);    
   ```
 
 ## router.getState
@@ -220,28 +182,26 @@ Obtains state information about the current page.
 | Type                       | Description          |
 | --------------------------- | -------------- |
 | [RouterState](#routerstate) | Page routing state.|
+**Example**
+
+```js
+var page = router.getState();
+console.log('current index = ' + page.index);
+console.log('current name = ' + page.name);
+console.log('current path = ' + page.path);
+```
+
 ## RouterState
+
 Describes the page routing state.
 
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
-| Name| Type| Description|
-| -------- | -------- | -------- |
-| index | number | Index of the current page in the stack.<br>>&nbsp;![icon-note.gif](public_sys-resources/icon-note.gif)&nbsp;**NOTE**<br>>&nbsp;The index starts from 1 from the bottom to the top of the stack.|
-| name | string | Name of the current page, that is, the file name.|
-| path | string | Path of the current page.|
-
-**Example**
-  ```js
-  export default {     
-    getState() {        
-      var page = router.getState();
-      console.log('current index = ' + page.index);
-      console.log('current name = ' + page.name);
-      console.log('current path = ' + page.path);
-    }
-  }
-  ```
+| Name | Type  | Description                                                        |
+| ----- | ------ | ------------------------------------------------------------ |
+| index | number | Index of the current page in the stack. The index starts from 1 from the bottom to the top of the stack.|
+| name  | string | Name of the current page, that is, the file name.                          |
+| path  | string | Path of the current page.                                        |
 
 ## router.enableAlertBeforeBackPage
 
@@ -252,26 +212,16 @@ Enables the display of a confirm dialog box before returning to the previous pag
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
 **Parameters**
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| options | [EnableAlertOptions](#enablealertoptions) | Yes| Description of the dialog box.|
+| Name | Type                                     | Mandatory| Description              |
+| ------- | ----------------------------------------- | ---- | ------------------ |
+| options | [EnableAlertOptions](#enablealertoptions) | Yes  | Description of the dialog box.|
 
 **Example**
 
-  ```js
-  export default {    
-    enableAlertBeforeBackPage() {        
-      router.enableAlertBeforeBackPage({            
-        message: 'Message Info',            
-        success: function() {                
-          console.log('success');            
-        },            
-        fail: function() {                
-          console.log('fail');            
-        },        
-      });    
-    }
-  }
+  ```js        
+  router.enableAlertBeforeBackPage({            
+    message: 'Message Info'        
+  });    
   ```
 ## EnableAlertOptions
 
@@ -279,9 +229,9 @@ Describes the confirm dialog box.
 
 **System capability**: SystemCapability.ArkUI.ArkUI.Full
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| message | string | Yes| Content displayed in the confirm dialog box.|
+| Name   | Type  | Mandatory| Description            |
+| ------- | ------ | ---- | ---------------- |
+| message | string | Yes  | Content displayed in the confirm dialog box.|
 
 ## router.disableAlertBeforeBackPage
 
@@ -293,11 +243,7 @@ Disables the display of a confirm dialog box before returning to the previous pa
 
 **Example**
   ```js
-  export default {    
-    disableAlertBeforeBackPage() {        
-      router.disableAlertBeforeBackPage();    
-    }
-  }
+router.disableAlertBeforeBackPage();    
   ```
 
 ##  router.getParams
@@ -316,122 +262,141 @@ Obtains the parameters passed from the page that initiates redirection to the cu
 
 **Example**
 
-- Web-like example
-  ```js
-  // Current page
-  export default {
-    pushPage() {
-      router.push({
-        url: 'pages/detail/detail',
-        params: {
-          data1: 'message',
-        },
-      });
-    }
+```
+router.getParams();
+```
+
+## RouterOptions
+
+Describes the page routing options.
+
+**System capability**: SystemCapability.ArkUI.ArkUI.Full
+
+| Name  | Type  | Mandatory| Description                                                        |
+| ------ | ------ | ---- | ------------------------------------------------------------ |
+| url    | string | Yes  | URI of the destination page, in either of the following formats:<br>- Absolute path of the page. The value is available in the pages list in the **config.json** file, for example:<br>- pages/index/index<br>- pages/detail/detail<br>- Particular path. If the URI is a slash (/), the home page is displayed. |
+| params | Object | No  | Data that needs to be passed to the destination page during redirection. After the destination page is displayed, it can use the passed data, for example, **this.data1** (**data1** is a key in **params**). If there is the same key (for example, **data1**) on the destination page, the passed **data1** value will replace the original value on the destination page.|
+
+
+  > **NOTE**
+  >
+  > The page routing stack supports a maximum of 32 pages.
+
+## RouterMode<sup>9+</sup>
+
+Enumerates the routing modes.
+
+**System capability**: SystemCapability.ArkUI.ArkUI.Full
+
+| Name    | Description                                                        |
+| -------- | ------------------------------------------------------------ |
+| Standard | Standard mode.                                                  |
+| Single   | Singleton mode.<br>If the URL of the target page already exists in the page stack, the page closest to the top of the stack is moved as a new page to the top of the stack.<br>If the URL of the target page does not exist in the page stack, the page is redirected to in standard mode.|
+
+## Examples
+
+### JavaScript-based Web-like Development Paradigm
+
+```js
+// Current page
+export default {
+  pushPage() {
+    router.push({
+      url: 'pages/detail/detail',
+      params: {
+        data1: 'message',
+      },
+    });
   }
-  ```
-  ```js
-  // detail page
-  export default {
-    onInit() {
-      console.info('showData1:' + router.getParams().data1);
-    }
+}
+```
+```js
+// detail page
+export default {
+  onInit() {
+    console.info('showData1:' + router.getParams().data1);
   }
-  ```
+}
+```
 
-- Declarative example
+### TypeScript-based Declarative Development Paradigm
 
-  ```ts
-  // Navigate to the target page through router.push with the params parameter carried.
-  import router from '@ohos.router'
-  
-  @Entry
-  @Component
-  struct Index {
-    async  routePage() {
-      let options = {
-        url: 'pages/second',
-        params: {
-          text: 'This is the value on the first page.',
-          data: {
-            array: [12, 45, 78]
-          },
-        }
-      }
-      try {
-        await router.push(options)
-      } catch (err) {
-        console.info(` fail callback, code: ${err.code}, msg: ${err.msg}`)
+```ts
+// Navigate to the target page through router.push with the params parameter carried.
+import router from '@ohos.router'
+
+@Entry
+@Component
+struct Index {
+  async  routePage() {
+    let options = {
+      url: 'pages/second',
+      params: {
+        text: 'This is the value on the first page.',
+        data: {
+          array: [12, 45, 78]
+        },
       }
     }
-  
-    build() {
-      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
-          Text('This is the first page.')
-            .fontSize(50)
-            .fontWeight(FontWeight.Bold)
-        Button() {
-          Text('next page')
-            .fontSize(25)
-            .fontWeight(FontWeight.Bold)
-        }.type(ButtonType.Capsule)
-            .margin({ top: 20 })
-            .backgroundColor('#ccc')
-            .onClick(() => {
-              this.routePage()
-        })
-      }
-      .width('100%')
-      .height('100%')
+    try {
+      await router.push(options)
+    } catch (err) {
+      console.info(` fail callback, code: ${err.code}, msg: ${err.msg}`)
     }
   }
-  ```
 
-  ```ts
-  // Receive the transferred parameters on the second page.
-  import router from '@ohos.router'
-  
-  @Entry
-  @Component
-  struct Second {
-    private content: string = "This is the second page."
-    @State text: string = router.getParams()['text']
-    @State data: any = router.getParams()['data']
-    @State secondData : string = ''
-    
-    build() {
-      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
-        Text(`${this.content}`)
+  build() {
+    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
+        Text('This is the first page.')
           .fontSize(50)
           .fontWeight(FontWeight.Bold)
-        Text(this.text)
-          .fontSize(30)
-          .onClick(()=>{
-            this.secondData = (this.data.array[1]).toString()
-          })
-        .margin({top:20})
-        Text('Value from the first page '+'' + this.secondData)
-          .fontSize(20)
-          .margin({top:20})
-          .backgroundColor('red')      
-      }
-      .width('100%')
-      .height('100%')
+      Button() {
+        Text('next page')
+          .fontSize(25)
+          .fontWeight(FontWeight.Bold)
+      }.type(ButtonType.Capsule)
+          .margin({ top: 20 })
+          .backgroundColor('#ccc')
+          .onClick(() => {
+            this.routePage()
+      })
     }
+    .width('100%')
+    .height('100%')
   }
-  ```
-
-## RouterOptions
-
-Describes the page routing options.
-
-**System capability**: SystemCapability.ArkUI.ArkUI.Lite
-
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| url | string | Yes| URI of the destination page, in either of the following formats:<br>-&nbsp; Absolute path of the page. The value is available in the pages list in the config.json file, for example:<br>&nbsp;&nbsp;-&nbsp;pages/index/index<br>&nbsp;&nbsp;-&nbsp;pages/detail/detail<br>-&nbsp; Particular path. If the URI is a slash (/), the home page is displayed.|
-| params | Object | No| Data that needs to be passed to the destination page during redirection. After the destination page is displayed, it can use the passed data, for example, **this.data1** (**data1** is a key in **params**). If there is the same key (for example, **data1**) on the destination page, the passed **data1** value will replace the original value on the destination page.|
+}
+```
 
+```ts
+// Receive the transferred parameters on the second page.
+import router from '@ohos.router'
 
-  > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
-  > The page routing stack supports a maximum of 32 pages.
+@Entry
+@Component
+struct Second {
+  private content: string = "This is the second page."
+  @State text: string = router.getParams()['text']
+  @State data: any = router.getParams()['data']
+  @State secondData : string = ''
+  
+  build() {
+    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
+      Text(`${this.content}`)
+        .fontSize(50)
+        .fontWeight(FontWeight.Bold)
+      Text(this.text)
+        .fontSize(30)
+        .onClick(()=>{
+          this.secondData = (this.data.array[1]).toString()
+        })
+      .margin({top:20})
+      Text('Value from the first page '+'' + this.secondData)
+        .fontSize(20)
+        .margin({top:20})
+        .backgroundColor('red')      
+    }
+    .width('100%')
+    .height('100%')
+  }
+}
+```