update docs against 7460

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

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

@@ -19,5 +19,5 @@ import StartOptions from '@ohos.application.StartOptions';
 
 | Name| Readable| Writable| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- | -------- | -------- |
-| windowMode | Yes| No| number | No| Window mode.|
+| [windowMode](js-apis-application-abilityConstant.md#AbilityConstant.WindowMode) | Yes| No| number | No| Window mode.|
 | displayId | Yes| No| number | No| Display ID.|

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

@@ -62,3 +62,17 @@ Enumerates ability continuation results.
 | AGREE           | 0    | Continuation agreed.|
 | REJECT           | 1    | Continuation denied.|
 | MISMATCH  | 2    | Mismatch.|
+
+## AbilityConstant.WindowMode
+
+Enumerates the window modes when an ability is started.
+
+**System capability**: SystemCapability.Ability.AbilityRuntime.Core
+
+| Name                       | Value| Description                |
+| ---                         | --- | ---                  |
+| WINDOW_MODE_UNDEFINED       | 0   | Undefined window mode.      |
+| WINDOW_MODE_FULLSCREEN      | 1   | The ability is displayed in full screen.           |
+| WINDOW_MODE_SPLIT_PRIMARY   | 100 | The ability is displayed in the primary window in split-screen mode.  |
+| WINDOW_MODE_SPLIT_SECONDARY | 101 | The ability is displayed in the secondary window in split-screen mode.  |
+| WINDOW_MODE_FLOATING        | 102 | The ability is displayed in a floating window.|