宿主线程如何接收子线程发送的消息？

import worker, { MessageEvents } from '@ohos.worker';
workerInstance: worker.ThreadWorker = new worker.ThreadWorker('entry/ets/workers/Myworker.ets');
aboutToAppear(): void {
  this.workerInstance.onmessage = ((e: MessageEvents) => {
      //宿主线程接收子线程发来的消息
    console.log("======"+JSON.stringify(e))
  })
}