学习和实现异步等待

// 模拟一个异步操作，如网络请求
function fetchData() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('Data fetched successfully!');
    }, 2000);
  });
}

// 使用async/await等待异步操作完成
async function getData() {
  try {
    const data = await fetchData();
    console.log(data);
  } catch (error) {
    console.error('Error fetching data:', error);
  }
}

getData();

// 使用Promise链
fetchData()
  .then(data => processData(data))
  .then(result => console.log(result))
  .catch(error => console.error(error));

// 使用async/await
async function processData() {
  try {
    const data = await fetchData();
    const result = await processData(data);
    console.log(result);
  } catch (error) {
    console.error(error);
  }
}

async function fetchMultipleData() {
  try {
    const [data1, data2] = await Promise.all([fetchData1(), fetchData2()]);
    console.log(data1, data2);
  } catch (error) {
    console.error(error);
  }
}