HarmonyOS 如何区分一般手机和折叠屏手机？

API参考如下：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-display-V5#displayonfoldstatuschange10

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-display-V5#displayisfoldable10

import { display } from '@kit.ArkUI';

@Entry({ routeName: 'FoldPage' })
@Component
export struct FoldPage {
  @State isFoldable: boolean = false;
  @State FoldStatus: number = display.FoldStatus.FOLD_STATUS_UNKNOWN;
  private onFoldStateChange: Callback<display.FoldStatus> = (data: display.FoldStatus) => {
    this.FoldStatus = data;
    // 在这里处理折叠屏的监听
    switch (this.FoldStatus) {
      case display.FoldStatus.FOLD_STATUS_EXPANDED:
        console.info('FoldPage::onFoldStateChange, 当前处于展开态');
        break;
      case display.FoldStatus.FOLD_STATUS_FOLDED:
        console.info('FoldPage::onFoldStateChange, 当前处于折叠态');
        break;
      case display.FoldStatus.FOLD_STATUS_HALF_FOLDED:
        console.info('FoldPage::onFoldStateChange, 当前处于半折叠态');
        break;
      default:
        console.info('FoldPage::onFoldStateChange, 当前处于未知态');
        break;
    }
  };

  aboutToAppear(): void {
    console.debug('FoldPage::aboutToAppear')
  }

  onPageShow(): void {
    console.debug('FoldPage::onPageShow')
    this.isFoldable = display.isFoldable();
    if (this.isFoldable) {
      this.FoldStatus = display.getFoldStatus();
      display.on('foldStatusChange', this.onFoldStateChange);
    }
  }

  onPageHide(): void {
    console.debug('FoldPage::onPageHide')
    if (this.isFoldable) {
      display.off('foldStatusChange', this.onFoldStateChange);
    }
  }

  aboutToDisappear(): void {
    console.debug('FoldPage::aboutToDisappear')
  }

  build() {
    Navigation() {
      Column() {
        Text('当前设备是否为折叠屏：' + this.isFoldable).TextStyle()
        Text('当前折叠屏的状态：' + this.FoldStatus.toString()).TextStyle()

      }
    }
    .width('100%')
    .mode(NavigationMode.Stack)
    .title('har包折叠屏测试') // 设置标题文字
  }
}

@Extend(Text)
function TextStyle() {
  .fontSize(28).margin({ top: 26 })
}
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