HarmonyOS的进程模型：

• 应用中（同一包名）的所有UIAbility运行在同一个独立进程中。

• WebView拥有独立的渲染进程。

公共事件订阅

// 引入事件包
import commonEvent from '@ohos.commonEventManager'; 

const EVENT_NAME = "testEvent"
const TAG = "huxiubo"

let subscribeInfo = {
  events: [EVENT_NAME] // 指定订阅的事件名称
}

@Entry
@Component
struct Index {
  @State text: string = "";
  @State publish: string = "";
  private subscriber = null;

  /**创建订阅者*/
  private createSubscriber() {
    if (this.subscriber) {
      this.text = "subscriber already created";
    } else {
      commonEvent.createSubscriber(subscribeInfo, (err, subscriber) => { // 创建结果的回调
        if (err) {
          console.info(TAG, "Failure Create subscriber");
          this.text = "create subscriber failure"
        } else {
          console.info(TAG, "Successed  Create subscriber");
          this.subscriber = subscriber; // 创建订阅成功
          this.text = "create subscriber success";
        }
      })
    }
  }

  // 订阅
  private subscribe() {
    if (this.subscriber) {
      // 根据创建的subscriber开始订阅事件
      commonEvent.subscribe(this.subscriber, (err, data) => {
        if (err) {
          // 异常处理
          this.text = "subscribe event failure: " + err;
        } else {
          // 接收到事件
          this.text = "subscribe event success: " + JSON.stringify(data.event) + ", " + JSON.stringify(data);
        }
      })
    } else {
      this.text = "please create subscriber";
    }
  }

  // 取消订阅
  private unsubscribe() {
    if (this.subscriber) {
      commonEvent.unsubscribe(this.subscriber, (err) => { // 取消订阅事件
        if (err) {
          this.text = "unsubscribe event failure: " + err;
        } else {
          this.subscriber = null;
          this.text = "unsubscribe event success: ";
        }
      })
    } else {
      this.text = "already subscribed";
    }
  }


  // 发布事件，事件名称为testEvent
  private publishEvent() {
    commonEvent.publish(EVENT_NAME, (err) => {
      if (err) { // 结果回调
        this.publish = "publish event error: " + err.code + ", " + err.message + ", " + err.name + ", " + err.stack;
      } else {
        this.publish = "publish event success";
      }
    })
  }


  // 发布事件，事件名称为testEvent
  private publishEventWithData() {
    commonEvent.publish(EVENT_NAME, {
      code: 10086, // 事件携带的参数
      data: "publish with data",
      parameters: {
        id: 1,
        content: "坚果"
      }
      // 事件携带的参数
    }, (err) => { // 结果回调
      if (err) {
        this.publish = "publish event error: " + err.code + ", " + err.message + ", " + err.name + ", " + err.stack;
      } else {
        this.publish = "publish event with data success";
      }
    })
  }

  build() {
    Column({ space: 10 }) {
      Button("创建订阅者")
        .size({ width: 260, height: 50 })
        .onClick(() => {
          this.createSubscriber();
        })
      Button("订阅公共事件")
        .size({ width: 260, height: 50 })
        .onClick(() => {
          this.subscribe();
        })

      Button("取消订阅")
        .size({ width: 260, height: 50 })
        .onClick(() => {
          this.unsubscribe();
        })

      Text(this.text)
        .size({ width: 260, height: 260 })
        .fontSize(22)
        .backgroundColor("#dbdbdb")

      Divider()
        .size({ width: 260, height: 5 })

      Button("发布公共事件")
        .size({ width: 260, height: 50 })
        .onClick(() => {
          this.publishEvent();
        })

      Button("发布公共事件指定公共信息")
        .size({ width: 260, height: 50 })
        .onClick(() => {
          this.publishEventWithData();
        })

      Text(this.publish)
        .size({ width: 260, height: 150 })
        .fontSize(22)
        .backgroundColor("#dbdbdb")

    }
    .padding(10)
    .size({ width: "100%", height: '100%' })
  }
}