如何在navigation跳转页面时返回传参

@Entry 
@Component 
struct Index { 
  @Provide('pathInfos') pathInfos: NavPathStack = new NavPathStack(); 
 
  @Builder 
  myRouter(name: string) { 
    if (name === 'MyFirstNavDestination') { 
      MyFirstNavDestination() 
    } else if (name === 'MySecondNavDestination') { 
      MySecondNavDestination() 
    } 
  } 
 
  build() { 
    Navigation(this.pathInfos) { 
      Row() { 
        Column() { 
          Text('hello world') 
        } 
        .height('100%') 
      } 
      .onClick(() => { 
        this.pathInfos.pushPathByName('MyFirstNavDestination', { paramA: 'test1' }); 
      }) 
    } 
    .navDestination(this.myRouter) 
  } 
} 
 
@Component 
export struct MyFirstNavDestination { 
  @Consume('pathInfos') pathInfos: NavPathStack; 
 
  getParamsPrint() { 
    console.info('xuerui', 'param is ' + JSON.stringify(this.pathInfos.getParamByName('MyFirstNavDestination'))); 
  } 
 
  build() { 
    NavDestination() { 
      Row() { 
        Column() { 
          Text('MyFirstNavDestination') 
        } 
        .width('100%') 
      } 
      .height('100%') 
      .onClick(() => { 
        this.pathInfos.pushPathByName('MySecondNavDestination', null); 
      }) 
    }.onShown(() => { 
      this.getParamsPrint(); 
    }) 
  } 
} 
 
@Component 
export struct MySecondNavDestination { 
  @Consume('pathInfos') pathInfos: NavPathStack; 
  private routerParams: string = 'test 2'; 
 
  build() { 
    NavDestination() { 
      Row() { 
        Text('MySecondNavDestination') 
      } 
      .height('100%') 
    }.onBackPressed(() => { 
      // pop B页面 
      this.pathInfos.pop(); 
 
      //获取当前栈顶页面名字（A页面） 
      let allPathName: Array<string> = this.pathInfos.getAllPathName(); 
      let pathNameA: string = allPathName[allPathName.length - 1]; 
 
      // pop A页面 
      this.pathInfos.pop(); 
 
      // 重新PUSH A页面 
      this.pathInfos.pushPath(new NavPathInfo(pathNameA, { paramA: this.routerParams })) 
      return true; 
    }) 
  } 
}
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