如何使用Promise编写我的函数

function fetchData() {
  return new Promise((resolve, reject) => {
    // 异步操作
    setTimeout(() => {
      const data = "Hello, World!";
      if (data) {
        resolve(data); // 操作成功，将结果传递给 resolve
      } else {
        reject("Error: Data not found."); // 操作失败，传递错误信息给 reject
      }
    }, 2000);
  });
}

fetchData()
  .then((data) => {
    console.log("Success:", data);
  })
  .catch((error) => {
    console.log("Error:", error);
  });

function getUserInfo() {
  return getName()
    .then((name) => getAge(name))
    .then((age) => {
      console.log("User info:", { name, age });
    })
    .catch((error) => {
      console.log("Error:", error);
    });
}

function getName() {
  return new Promise((resolve) => {
    setTimeout(() => {
      const name = "John";
      resolve(name);
    }, 1000);
  });
}

function getAge(name) {
  return new Promise((resolve) => {
    setTimeout(() => {
      const age = 30;
      resolve(age);
    }, 1000);
  });
}