如何实现一个页面显示子窗口

// WindowModel.ets
createSubWindow() {
  if (this.windowStage === undefined) {
    Logger.error('Failed to create the subWindow.');
    return;
  }
创建子窗口
  this.windowStage.createSubWindow(CommonConstants.SUB_WINDOW_NAME, (err, data: window.Window) => {
    if (err.code) {
      Logger.error(`Failed to create the window. Code:${err.code}, message:${err.message}`);
      return;
    }
获取子窗口实例
    this.subWindowClass = data;
获取屏幕宽高
    let screenWidth = display.getDefaultDisplaySync().width;
    let screenHeight = display.getDefaultDisplaySync().height;
根据子窗口宽高比计算子窗口宽高
    let windowWidth = screenWidth * CommonConstants.SUB_WINDOW_WIDTH_RATIO;
    let windowHeight = windowWidth / CommonConstants.SUB_WINDOW_ASPECT_RATIO;
计算子窗口起始坐标
    let moveX = (screenWidth - windowWidth) / 2;
    let moveY = screenHeight - windowHeight;
将子窗口移动到起始坐标处
    this.subWindowClass.moveWindowTo(moveX, moveY, (err) => {
      if (err.code) {
        Logger.error(`Failed to move the window. Code:${err.code}, message:${err.message}`);
        return;
      }
    });
设置子窗口的宽高
    this.subWindowClass.resize(windowWidth, windowHeight, (err) => {
      if (err.code) {
        Logger.error(`Failed to change the window size. Code:${err.code}, message:${err.message}`);
        return;
      }
    });
设置子窗口展示的页面内容
    this.subWindowClass.setUIContent(CommonConstants.VERIFY_PAGE_URL, (err) => {
      if (err.code) {
        Logger.error(`Failed to load the content. Code:${err.code}, message:${err.message}`);
        return;
      }
      if (this.subWindowClass === undefined) {
        Logger.error('subWindowClass is undefined.');
        return;
      }
设置子窗口背景颜色
      this.subWindowClass.setWindowBackgroundColor('#00000000');
显示子窗口
      this.subWindowClass.showWindow((err) => {
        if (err.code) {
          Logger.error(`Failed to show the window. Code:${err.code}, essage:${err.message}`);
          return;
        }
      });
    });
   });
}