HarmonyOS 子窗口弹出popup问题

窗口内的页面只能显示在窗口内。适配场景demo修改如下：

EntryAbility.ets

import { window } from '@kit.ArkUI';
import UIAbility from '@ohos.app.ability.UIAbility';


export default class EntryAbility extends UIAbility {
  windowClass: window.Window | null = null
  windowStaSge_: window.WindowStage | null = null
  sub_windowClass: window.Window | null = null
  onWindowStageCreate(windowStage: window.WindowStage): void {
    AppStorage.setOrCreate('windowStage', windowStage);
    this.windowStaSge_ = windowStage
    windowStage.getMainWindow((err, data) => {
      if (err.code) {
        return;
      }
      this.windowClass = data;
      this.windowClass.setWindowTouchable(true)
    })

    windowStage.loadContent('pages/Index', (err) => {
      if (err.code) {
        return;
      }
    });
  }
}

index.ets

import { router, window } from '@kit.ArkUI';

@Entry
@Component
struct Page5 {
  @State message: string = 'Hello World';
  @State windowStage: window.WindowStage = AppStorage.get("windowStage") as window.WindowStage
  onPageShow(): void {}

  onPageHide(): void {
    if (window.findWindow("mySubWindow4").isWindowShowing()) {
      window.findWindow("mySubWindow4").destroyWindow()
    }
  }

  showSubWindow(){
    this.windowStage.createSubWindow("mySubWindow4", (err, windowClass) => {
      if (err.code > 0) {
        console.error("failed to create subWindow Cause:" + err.message)
        return;
      }
      // 设置子窗口加载页
      try {
        windowClass.setUIContent("pages/SubWindow", () => {
          windowClass.setWindowBackgroundColor("#00000000")
        });
        // 设置子窗口左上角坐标
        windowClass.moveWindowTo(0, 200)
        // 设置子窗口大小
        windowClass.resize(vp2px(400), vp2px(400))
        // 展示子窗口
        windowClass.showWindow();
        // 设置子窗口全屏化布局不避让安全区
        windowClass.setWindowLayoutFullScreen(true);
      } catch (err) {
        console.error("failed to create subWindow Cause:" + err)
      }
    })
  }
  build() {
    Column({ space: 5 }) {
      Button('测试虚拟定位功能').onClick(() => {
        this.showSubWindow()
      })

      Button('跳转页面').onClick(() => {
        router.pushUrl({
          url: "pages/TestPage",
          params: {
            name: '我是来自页面Index的数据',
            count: 100
          }
        }, router.RouterMode.Single)
      })

      Button('跳轉頁面 ').onClick(() => {
        router.pushUrl({
          url: "pages/TestPage",
          params: {
            name: '我是来自页面Index的数据',
            count: 100
          }
        }, router.RouterMode.Single)
      })
    }
    .justifyContent(FlexAlign.Center)
    .width('100%')
    .height('100%')
  }
}