从导出的异步函数返回

function asyncFunction(callback) {
  setTimeout(() => {
    const result = '异步操作结果';
    callback(result);
  }, 1000);
}

asyncFunction((result) => {
  console.log(result); // 输出：异步操作结果
});

function asyncFunction() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      const result = '异步操作结果';
      resolve(result);
    }, 1000);
  });
}

asyncFunction().then((result) => {
  console.log(result); // 输出：异步操作结果
});

async function asyncFunction() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      const result = '异步操作结果';
      resolve(result);
    }, 1000);
  });
}

(async () => {
  const result = await asyncFunction();
  console.log(result); // 输出：异步操作结果
})();