如何配置express-handlebars将其与nodemailer链接？

npm install express-handlebars nodemailer

const express = require('express');
const exphbs = require('express-handlebars');
const nodemailer = require('nodemailer');

app.engine('handlebars', exphbs());
app.set('view engine', 'handlebars');

const transporter = nodemailer.createTransport({
  host: 'smtp.example.com',
  port: 587,
  secure: false, // true for 465, false for other ports
  auth: {
    user: 'your-email@example.com',
    pass: 'your-password'
  }
});

app.post('/send-email', (req, res) => {
  const { to, subject, body } = req.body;
  
  const html = template.render(body); // 使用express-handlebars渲染邮件内容

  const mailOptions = {
    from: 'your-email@example.com',
    to: to,
    subject: subject,
    html: html
  };

  transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
      console.log(error);
      res.status(500).send('邮件发送失败');
    } else {
      console.log('邮件已发送：' + info.response);
      res.status(200).send('邮件已成功发送');
    }
  });
});

app.listen(3000, () => {
  console.log('应用程序已启动，监听端口3000');
});