学生考勤管理系统

import React, { useState } from 'react';
import axios from 'axios';

function AttendanceSystem() {
  const [studentId, setStudentId] = useState('');
  const [attendanceStatus, setAttendanceStatus] = useState('');

  const markAttendance = async () => {
    try {
      const response = await axios.post('/api/attendance', { studentId });
      setAttendanceStatus(response.data.status);
    } catch (error) {
      console.error('Error marking attendance:', error);
    }
  };

  return (
    <div>
      <h1>学生考勤管理系统</h1>
      <input
        type="text"
        placeholder="输入学生ID"
        value={studentId}
        onChange={(e) => setStudentId(e.target.value)}
      />
      <button onClick={markAttendance}>打卡</button>
      {attendanceStatus && <p>考勤状态: {attendanceStatus}</p>}
    </div>
  );
}

export default AttendanceSystem;

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

app.use(bodyParser.json());

const attendanceRecords = {};

app.post('/api/attendance', (req, res) => {
  const { studentId } = req.body;
  const timestamp = new Date().toISOString();

  if (!attendanceRecords[studentId]) {
    attendanceRecords[studentId] = [];
  }

  attendanceRecords[studentId].push(timestamp);
  res.json({ status: '出勤成功' });
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});