HarmonyOS 如何实现半透明的Page

onWindowStageCreate(windowStage: window.WindowStage): void {  
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate');  
  AppStorage.setOrCreate("windowStage", windowStage);  
  windowStage.loadContent('pages/APage', this.storage, (err, data) => {  
  if (err.code) {  
  hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');  
  return;  
}  
hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');  
});  
}
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import window from '@ohos.window';  
  
@Entry  
@Component  
struct APage {  
  build() {  
    Row() {  
      Column() {  
        Button("pageA").onClick(() => {  
          let windowStage_: window.WindowStage = AppStorage.get("windowStage") as window.WindowStage;  
          windowStage_.createSubWindow("subWindow", (err, win) => {//创建透明子窗口并打开  
            win.setUIContent('pages/BPage');  
            win.showWindow();  
          })  
        })  
      }  
      .width('100%')  
    }  
    .height('100%')  
    .backgroundColor(Color.Pink)  
  }  
}
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import window from '@ohos.window';  
  
@Entry  
@Component  
struct BPage {  
  @State message: string = 'BPage';  
  
  aboutToAppear() {  
    window.findWindow("subWindow").setWindowBackgroundColor("#00000000") //设置子窗口背景透明  
  }  
  
  onBackPress() { //关闭子窗口  
    window.findWindow("subWindow").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("#32ffffff") //组件背景，可以修改为#00000000透明  
    .height('100%')  
  }  
}
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