如何优化代码以并行运行每个fetch

const urls = ['url1', 'url2', 'url3']; // 假设有三个URL需要请求

// 使用Promise.all并行执行多个fetch请求
Promise.all(urls.map(url => fetch(url)))
  .then(responses => {
    // 处理每个fetch请求的响应
    responses.forEach(response => {
      // 处理响应数据
    });
  })
  .catch(error => {
    // 处理错误
  });

const urls = ['url1', 'url2', 'url3']; // 假设有三个URL需要请求

// 创建多个Web Worker
const workers = urls.map(url => {
  const worker = new Worker('fetch-worker.js');
  worker.postMessage(url); // 向Web Worker发送消息
  return worker;
});

// 监听Web Worker的消息
workers.forEach(worker => {
  worker.onmessage = event => {
    const response = event.data; // 获取Web Worker返回的响应
    // 处理响应数据
  };
});

// 销毁Web Worker
workers.forEach(worker => worker.terminate());

const urls = ['url1', 'url2', 'url3']; // 假设有三个URL需要请求

// 使用Parallel.js并行执行多个fetch请求
const parallel = new Parallel(urls, {
  evalPath: 'parallel.js' // 并行代码的路径
});

parallel.map(fetch)
  .then(responses => {
    // 处理每个fetch请求的响应
    responses.forEach(response => {
      // 处理响应数据
    });
  })
  .catch(error => {
    // 处理错误
  });