使用Web Workers，将 async/await 操作移至另一个线程，以便在主线程中不会阻塞浏览器。

示例代码：

worker.js

// 一个耗时的操作
function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

// 在这里使用 async/await
async function workerFunction() {
  console.log('Worker: Doing some work');
  await sleep(5000);
  console.log('Worker: Work complete');
}

// 监听来自主线程的消息
onmessage = async function(event) {
  console.log('Worker: Message received from main thread');
  await workerFunction();
  postMessage('Worker: Work complete');
}

main.js

// 创建 worker 实例
const myWorker = new Worker('worker.js');

// 向 worker 发送消息并收到响应
myWorker.onmessage = function(event) {
  console.log('Main thread: Message received from worker');
  console.log(event.data);
};

// 发送消息给 worker
console.log('Main thread: Sending message to worker');
myWorker.postMessage('Start work');