如何在实体化中只从多个函数的返回值中获取必要的值？

function fetchUser() {
  return { id: 1, name: 'Alice', age: 25, email: 'alice@example.com' };
}

function fetchOrders() {
  return [
    { id: 101, userId: 1, product: 'Book', amount: 20 },
    { id: 102, userId: 1, product: 'Pen', amount: 5 }
  ];
}

// 获取用户信息
const user = fetchUser();
const userName = user.name;

// 获取订单信息并计算总金额
const orders = fetchOrders();
const totalAmount = orders.reduce((acc, order) => acc + order.amount, 0);

console.log(userName, totalAmount); // 输出: Alice 25

const getUserAndTotalAmount = () => {
  const user = fetchUser();
  const orders = fetchOrders();
  const totalAmount = orders.reduce((acc, order) => acc + order.amount, 0);
  return { userName: user.name, totalAmount };
};

const result = getUserAndTotalAmount();
console.log(result); // 输出: { userName: 'Alice', totalAmount: 25 }