使用NodeJS和MongoDB跟踪上次登录日期

const express = require('express');
const mongoose = require('mongoose');

// 连接MongoDB数据库
mongoose.connect('mongodb://localhost/myapp', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log('MongoDB connected'))
  .catch(err => console.log(err));

// 定义用户模型
const User = mongoose.model('User', {
  username: String,
  password: String,
  lastLoginDate: Date
});

const app = express();

// 用户注册
app.post('/register', async (req, res) => {
  const { username, password } = req.body;

  // 创建新用户
  const newUser = new User({
    username,
    password,
    lastLoginDate: new Date()
  });

  try {
    await newUser.save();
    res.status(200).send('User registered successfully');
  } catch (err) {
    res.status(500).send('Error registering user');
  }
});

// 用户登录
app.post('/login', async (req, res) => {
  const { username, password } = req.body;

  try {
    const user = await User.findOne({ username, password });

    if (user) {
      // 更新上次登录日期
      user.lastLoginDate = new Date();
      await user.save();
      res.status(200).send('User logged in successfully');
    } else {
      res.status(401).send('Invalid credentials');
    }
  } catch (err) {
    res.status(500).send('Error logging in');
  }
});

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