嵌套ajax调用的最佳实践

function makeAjaxRequest(url) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.onload = () => {
      if (xhr.status === 200) {
        resolve(xhr.responseText);
      } else {
        reject(xhr.statusText);
      }
    };
    xhr.onerror = () => {
      reject(xhr.statusText);
    };
    xhr.send();
  });
}

async function fetchData() {
  try {
    const data1 = await makeAjaxRequest('url1');
    const data2 = await makeAjaxRequest('url2');
    const data3 = await makeAjaxRequest('url3');

    // 处理数据

  } catch (error) {
    console.error(error);
  }
}