在post路由上，使用nodemailer发送电子邮件，并使用passport.authenticate将用户保存到mongodb

npm install nodemailer passport

const nodemailer = require('nodemailer');
const passport = require('passport');

const transporter = nodemailer.createTransport({
  host: 'smtp.exmail.qq.com',
  port: 465,
  secure: true,
  auth: {
    user: 'your-email@example.com',
    pass: 'your-email-password'
  }
});

app.post('/route', (req, res) => {
  const { name, email } = req.body;

  // 创建邮件内容
  const mailOptions = {
    from: 'your-email@example.com',
    to: email,
    subject: 'Welcome to our website',
    text: `Dear ${name}, welcome to our website!`
  };

  // 发送邮件
  transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
      console.log(error);
      res.status(500).send('Error sending email');
    } else {
      console.log('Email sent: ' + info.response);
      res.status(200).send('Email sent successfully');
    }
  });
});

npm install passport-local mongoose

const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;
const mongoose = require('mongoose');

const User = mongoose.model('User', new mongoose.Schema({
  username: String,
  password: String
}));

passport.use(new LocalStrategy(
  function(username, password, done) {
    User.findOne({ username: username }, function(err, user) {
      if (err) { return done(err); }
      if (!user) { return done(null, false); }
      if (!user.validPassword(password)) { return done(null, false); }
      return done(null, user);
    });
  }
));

app.post('/route', passport.authenticate('local', {
  successRedirect: '/success',
  failureRedirect: '/failure'
}));