HarmonyOS 鸿蒙Next 事件回调

//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,
}
};
      <span class="hljs-keyword">let</span> innerEvent: emitter.InnerEvent = {
        eventId: <span class="hljs-number">12222</span>,
        priority: emitter.EventPriority.HIGH
      };
      <span class="hljs-comment">//发布id为12222的事件</span>
      emitter.emit(innerEvent, eventData);
    })
}
.justifyContent(FlexAlign.Center)
.width(<span class="hljs-string">'100%'</span>)
.height(<span class="hljs-string">'100%'</span>)
}
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-emitter-0000001860296413#ZH-CN_TOPIC_0000001860296413__emitteremit