Javascript重构-从异步函数结果或回退值中解构数据

async function fetchUserData(userId) {
  // 模拟异步操作，如从API获取数据
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (userId === '123') {
        resolve({ name: 'John Doe', age: 30, email: 'john@example.com' });
      } else {
        reject(new Error('User not found'));
      }
    }, 1000);
  });
}

async function getUserInfo(userId) {
  try {
    const { name, age, email } = await fetchUserData(userId);
    console.log(`Name: ${name}, Age: ${age}, Email: ${email}`);
  } catch (error) {
    const { message } = error;
    const fallbackUser = { name: 'Unknown', age: 0, email: 'none@example.com' };
    const { name, age, email } = fallbackUser;
    console.log(`Failed to fetch user info: ${message}. Using fallback values: Name: ${name}, Age: ${age}, Email: ${email}`);
  }
}

getUserInfo('123'); // 成功获取用户信息
getUserInfo('456'); // 使用回退值

async function getUserInfo(userId) {
  try {
    const { name, age, email } = await fetchUserData(userId);
    console.log(`Name: ${name}, Age: ${age}, Email: ${email}`);
  } catch (error) {
    console.error(`Failed to fetch user info: ${error.message}`);
    // 提供回退值并进行解构
    const fallbackUser = { name: 'Unknown', age: 0, email: 'none@example.com' };
    const { name, age, email } = fallbackUser;
    console.log(`Using fallback values: Name: ${name}, Age: ${age}, Email: ${email}`);
  }
}