HarmonyOS 通过pushNamedRoute跳转到新页面，如何在页面返回的时候拿到结果

可以使用AppStorage来获取返回结果，参考示例如下：

import router from '@ohos.router';
import { BusinessError } from '@ohos.base';

import('@ohos/library/src/main/ets/pages/Index'); // 引入共享包中的命名路由页面

@Entry
@Component
struct Index {
  @StorageLink('params') @Watch('getData') params: string = ''

  getData() {
    let res = AppStorage.get("params") as string
    console.log(`页面跳转返回的参数为：${res}`)
  }

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Text('Hello World')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .margin({ top: 20 })
        .backgroundColor('#ccc')
        .onClick(() => { // 点击跳转到其他共享包中的页面
          try {
            router.pushNamedRoute({
              name: 'myPage',
              params: {
                data1: 'message',
                data2: {
                  data3: [123, 456, 789]
                }
              }
            })
          } catch (err) {
            let message = (err as BusinessError).message
            let code = (err as BusinessError).code
            console.error(`pushNamedRoute failed, code is ${code}, message is ${message}`);
          }
        })
    }
    .width('100%')
    .height('100%')
  }
}

// library/src/main/ets/pages/Index.ets
import { router } from '@kit.ArkUI'

// library为新建共享包自定义的名字
@Entry({ routeName: 'myPage' })
@Component
export struct MyComponent {
  build() {
    Row() {
      Column() {
        Text('Library Page')
          .fontSize(50)
          .fontWeight(FontWeight.Bold)

        Button('返回').onClick(() => {
          router.back()
          AppStorage.set('params', '666')
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

AppStorage官方参考链接如下：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/arkts-appstorage-V5#从ui内部使用appstorage和localstorage