HarmonyOS 如何返回系统桌面

可以在页面的onBackPress中通过windowStage获取主窗口对象，然后用minimize完成主窗口的最小化。参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-window-V5#minimize11参考demo：

import window from '@ohos.window'
import { BusinessError } from '@ohos.base';
@Entry
@Component
struct Page240605161307072 {
  @State message: string = 'Hello World';
  onBackPress() {
    const context = getContext(this)
    window.getLastWindow(getContext()).then((data) => {
      //获取窗口对象
      let windowClass = data;
      windowClass.minimize((err: BusinessError) => {
        const errCode: number = err.code;
        if (errCode) {
          console.error('Failed to minimize the window. Cause: ' + JSON.stringify(err));
          return;
        }
        console.info('Succeeded in minimizing the window.');
      });
      console.info('Succeeded in obtaining the top window. Data: ' + JSON.stringify(data));
    });
    return true;
  }
  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
        TextInput()
      }
      .width('100%')
    }
    .height('100%')
  }
}