HarmonyOS 让app回到后台(桌面)的系统方法

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%') 
  } 
}