JavaScript如何正确处理Node回调，导入函数时代码乱序

Question

我是JS和Node的新手，我一直在尝试编写用于人员管理的API，例如跟踪员工的缺勤情况，并且我将Node与express.js结合使用。

当我决定将功能放在自己的模块/文件中时，我遇到了排序问题。

当经理在 localhost：3000 / user / $ userId 上执行GET请求时，我基本上想检索员工缺席的情况，但是我的功能运行不正常，我一直在阅读有关节点回调，但我仍然无法弄清楚。

API调用的代码：

/* Returns for each employee find her/his absences */
app.get('/user/:userId', async (req, res) => {
  let employee = api.getEmployeeAbsences(req.params.userId);
  console.log(`Employee retrivied ${employee}`);
});

用于检索员工及其缺勤情况的API函数的代码。

const readJsonFile = (path) => new Promise((resolve) => fs.readFile(path, 'utf8', (_, data) => resolve(data)))
  .then((data) => JSON.parse(data))
  .then((data) => data.payload);

export const members = () => readJsonFile(MEMBERS_PATH);
export const absences = () => readJsonFile(ABSENCES_PATH);

var exports = module.exports = {};

/* Returns the employee(given by the userId) info and his last absence if she or he exists */
exports.getEmployeeAbsences = function(userId) {
  console.log('Start of Function');
  members().then((employees) => {
    console.log('Members');  
    let employee = employees.filter(emp => userId == emp.userId)[0];
    // If employee wasn't found
    if (!employee) {
      return undefined;
    } else {
      absences().then((absences) => {
        console.log('Absences');
        // Assigning employee absences
        employee = Object.assign(employee, { absences: absences.filter(abs => employee.userId == abs.userId) });
        console.log(employee);
        return employee;
      });
    }
  });
  console.log(`End of function ${userId}`);
}

乱序输出示例：