HarmonyOS 事件回调

使用自定义订阅事件的方式来实现该功能：参考demo：

//index.ets
import display from '@ohos.display';
import emitter from '@ohos.events.emitter';
import { router } from '@kit.ArkUI';
import { JSON } from '@kit.ArkTS';

@Entry
@Component
struct DisplayTest {

  build() {
    Column({space:20}){
      Button('Test')
        .type(ButtonType.Capsule)
        .onClick(() => {
          let innerEvent: emitter.InnerEvent = {
            eventId: 12222
          };
          //触发id为12222的事件
          emitter.on(innerEvent, (data) => {
            console.info('once callback' + JSON.stringify(data));
          });
          router.pushUrl({
            url:'pages/PageOne'
          })
        })
        .width('50%')
    }
    .width("100%")
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}

//PageOne.ets
import emitter from '@ohos.events.emitter';

@Entry
@Component
struct PageOne {



  build() {
    Column(){
      Text('PageOne')
        .width('50%')
      Button('send')
        .type(ButtonType.Capsule)
        .width('50%')
        .onClick(() => {
          let eventData: emitter.EventData = {
            data: {
              "content": "c",
              "id": 1,
            }
          };

          let innerEvent: emitter.InnerEvent = {
            eventId: 12222,
            priority: emitter.EventPriority.HIGH
          };
          //发布id为12222的事件
          emitter.emit(innerEvent, eventData);
        })
    }
    .justifyContent(FlexAlign.Center)
    .width('100%')
    .height('100%')
  }
}
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参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-emitter-V5#emitteremit