HarmonyOS 鸿蒙Next：Column给了宽高100%，为何仍无法铺满整个页面？

HarmonyOS NEXT中Column给了宽高100%，为何仍无法铺满整个页面？，需要设置 沉浸式状态栏，要真机或者模拟器调试

参考：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-window-V5 沉浸式状态栏

    let windowClass: window.Window | undefined = undefined;
    windowStage.getMainWindow((err: BusinessError, data) => {
      windowClass=data
      let promise = windowClass.setWindowLayoutFullScreen(true);
      promise.then(() => {
        //设置状态栏透明背景
        windowStage.getMainWindowSync().setWindowSystemBarEnable(['status']).then(() => {
          const systemBarProperties: window.SystemBarProperties = {
            statusBarColor: '#00000000'
          };
          //设置窗口内导航栏、状态栏的属性
          windowStage.getMainWindowSync().setWindowSystemBarProperties(systemBarProperties)
            .then(() => {
              console.info('Succeeded in setting the system bar properties.');
            }).catch((err:object) => {
            console.error('Failed to set the system bar properties. Cause: ' + JSON.stringify(err));
          });
        })
      }).catch((err: BusinessError) => {
        console.error(`Failed to set the window layout to full-screen mode. Cause code: ${err.code}, message: ${err.message}`);
      });
    })