1# ArkUI Subsystem Changelog 2 3## cl.arkui.1 Return Value Type Change of getInspectorTree 4 5**Change Impact** 6 7The code that uses the **getInspectorTree** API in versions earlier than OpenHarmony 4.0.3.2 must be adapted. 8 9**Key API/Component Changes** 10 11The return value of the **getInspectorTree** API is changed from the string type to the Object type. 12 13**Adaptation Guide** 14 15Adapt the code that takes the return value of **getInspectorTree** as a string.The sample code is as follows: 16 17- Before change: 18 19```typescript 20console.info(getInspectorTree()) 21``` 22 23- After change: 24 25```typescript 26console.info(JSON.stringify(getInspectorTree())) 27``` 28 29## cl.arkui.2 Deprecation the forceRebuild Attribute of \<GridItem> 30 31**Change Impact** 32 33None. The attribute has no effect. 34 35**Key API/Component Changes** 36 37Deprecate the **forceRebuild** attribute of the **\<GridItem>** component. 38 39**Adaptation Guide** 40 41Delete the code that uses the **forceRebuild** attribute. This will not affect the functionality of the **\<GridItem>** component. 42 43 44## cl.arkui.1 API Changes of the Router Module in API Version 9 45 46Replaced the **enableAlertBeforeBackPage**, **enableBackPageAlert**, **disableAlertBeforeBackPage** APIs in **ohos.router** to **showAlertBeforeBackPage** and **hideAlertBeforeBackPage** to facilitate development. 47 48**Change Impact** 49 50The **enableAlertBeforeBackPage** and **enableBackPageAlert** APIs must be replaced with **showAlertBeforeBackPage**. 51 52The **disableAlertBeforeBackPage** API must be replaced with **hideAlertBeforeBackPage**. 53 54**Key API/Component Changes** 55 56**router.enableAlertBeforeBackPage**, **router.enableBackPageAlert**, and **router.disableAlertBeforeBackPage** 57 58* Before change: 59 60```ts 61router.enableAlertBeforeBackPage(); 62router.enableBackPageAlert() 63``` 64 65* After change: 66 67```ts 68router.showAlertBeforeBackPage() 69``` 70 71* Before change: 72 73```ts 74router.disableAlertBeforeBackPage() 75``` 76 77* After change: 78 79```ts 80router.hideAlertBeforeBackPage() 81``` 82 83**Adaptation Guide** 84 85Replace **enableAlertBeforeBackPage** and **enableBackPageAlert** with **showAlertBeforeBackPage**. 86 87Replace **disableAlertBeforeBackPage** with **hideAlertBeforeBackPage**. 88