如何在Worker中开启多级子线程

const workerInstance = new worker.ThreadWorker("entry/ets/pages/worker.ets"); 
 
// 主线程向worker线程传递信息 
workerInstance.postMessage("123"); 
 
// 主线程接收worker线程信息 
workerInstance.onmessage = (e: MessageEvents): void => { 
  // data：worker线程发送的信息 
  let data: string = e.data; 
  console.log("main thread onmessage"); 
  const workerInstance1 = new worker.ThreadWorker("entry/ets/pages/work.ets"); 
  workerInstance1.postMessage("123"); 
  workerInstance1.onmessage = (e: MessageEvents): void => { 
    // data：worker线程发送的信息 
    let data: string = e.data; 
    console.log("main thread onmessage1"); 
    // 销毁Worker对象 
    workerInstance1.terminate(); 
  } 
  // 在调用terminate后，执行onexit 
  workerInstance1.onexit = (code) => { 
    console.log("main thread terminate"); 
  } 
  // 销毁Worker对象 
  workerInstance.terminate(); 
 
} 
// 在调用terminate后，执行onexit 
workerInstance.onexit = (code) => { 
  console.log("main thread terminate"); 
} 
 
workerInstance.onerror = (err: ErrorEvent) => { 
  console.log("main error message " + err.message); 
}

// 创建worker线程中与主线程通信的对象 
const workerPort = worker.workerPort 
 
// worker线程接收主线程信息 
workerPort.onmessage = (e: MessageEvents): void => { 
  // data：主线程发送的信息 
  let data: string = e.data; 
  console.log("worker.ets onmessage"); 
 
  // worker线程向主线程发送信息 
  workerPort.postMessage("123") 
} 
 
// worker线程发生error的回调 
workerPort.onerror = (err: ErrorEvent) => { 
  console.log("worker.ets onerror" + err.message); 
}

"buildOption": { 
  "sourceOption": { 
    "workers": [ 
    "./src/main/ets/pages/worker.ets", 
    "./src/main/ets/pages/work.ets" 
    ] 
  } 
}