正在等待所有HTTP请求返回，然后再继续执行其他函数

function httpRequest(url, callback) {
  // 发送HTTP请求并在请求完成后调用回调函数
  // ...
  callback(response);
}

function handleResponse(response) {
  // 处理HTTP请求的返回结果
  // ...
}

function waitForAllRequests(urls, callback) {
  var count = urls.length;
  var responses = [];

  urls.forEach(function(url, index) {
    httpRequest(url, function(response) {
      responses[index] = response;
      count--;

      if (count === 0) {
        callback(responses);
      }
    });
  });
}

waitForAllRequests(['url1', 'url2', 'url3'], function(responses) {
  // 所有HTTP请求返回后执行的逻辑
  // ...
});

function httpRequest(url) {
  return new Promise(function(resolve, reject) {
    // 发送HTTP请求并在请求完成后调用resolve或reject
    // ...
  });
}

function handleResponse(response) {
  // 处理HTTP请求的返回结果
  // ...
}

function waitForAllRequests(urls) {
  var promises = urls.map(function(url) {
    return httpRequest(url);
  });

  return Promise.all(promises);
}

waitForAllRequests(['url1', 'url2', 'url3'])
  .then(function(responses) {
    // 所有HTTP请求返回后执行的逻辑
    // ...
  })
  .catch(function(error) {
    // 处理错误情况
    // ...
  });

async function httpRequest(url) {
  // 发送HTTP请求并返回结果
  // ...
}

function handleResponse(response) {
  // 处理HTTP请求的返回结果
  // ...
}

async function waitForAllRequests(urls) {
  var responses = [];

  for (var url of urls) {
    var response = await httpRequest(url);
    responses.push(response);
  }

  return responses;
}

waitForAllRequests(['url1', 'url2', 'url3'])
  .then(function(responses) {
    // 所有HTTP请求返回后执行的逻辑
    // ...
  })
  .catch(function(error) {
    // 处理错误情况
    // ...
  });