HarmonyOS 页面级的半透明可以如何实现

// Page1.ets  
import window from '@ohos.window';  
  
@Entry  
@Component  
struct Page2 {  
  @State message: string = 'page Page2';  
  
  onPageHide() {  
    console.log("pageHide")  
  }  
  
  build() {  
    Row() {  
      Column() {  
        Text(this.message)  
          .fontSize(50)  
          .fontWeight(FontWeight.Bold)  
        Button("pageB").onClick(() => {  
          let windowStege: window.WindowStage = AppStorage.get("windowStage") as window.WindowStage;  
          windowStege.createSubWindow("hello", (err, win) => {  
            win.setUIContent('pages/Page2');  
            win.showWindow();  
          })  
        })  
      }  
      .width('100%')  
    }  
    .height('100%')  
    .backgroundColor(Color.Pink)  
  }  
}  
// Page2.ets  
import window from '@ohos.window';  
  
@Entry  
@Component  
struct Index {  
  @State message: string = 'page Index';  
  
  aboutToAppear() {  
    window.findWindow("hello").setWindowBackgroundColor("#00000000")  
  }  
  
  onBackPress() {  
    window.findWindow("hello").destroyWindow().then((res) => {  
      console.log("destroyWindow success")  
    }).catch(() => {  
      console.log("destroyWindow fail")  
    })  
    return true  
  }  
  
  build() {  
    Row() {  
      Column() {  
        Text(this.message)  
          .fontSize(50)  
          .fontWeight(FontWeight.Bold)  
      }  
      .width('100%')  
      .backgroundColor(Color.Red)  
    }  
    .alignItems(VerticalAlign.Top)  
    .height('100%')  
    .backgroundColor("#80ffffff")  
  }  
}

onWindowStageCreate(windowStage: window.WindowStage): void {  
  // Main window is created, set main page for this ability  
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate');  
  
  windowStage.loadContent('pages/Page231206095213071', (err, data) => {  
  if (err.code) {  
  hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');  
  return;  
}  
AppStorage.setAndLink("windowStage", windowStage);// 关键代码  
hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');  
});  
}