如何在mailer中使用模板变量

const nodemailer = require('nodemailer');
const emailTemplate = require('./emailTemplate'); // 假设这是一个包含模板变量的HTML文件

// 创建Nodemailer传输对象
let transporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: 'your-email@gmail.com',
        pass: 'your-email-password'
    }
});

// 邮件选项
let mailOptions = {
    from: 'your-email@gmail.com',
    to: 'recipient@example.com',
    subject: 'Test Email with Template Variables',
    html: emailTemplate.replace('{{username}}', 'John Doe').replace('{{orderNumber}}', '12345')
};

// 发送邮件
transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
        console.log(error);
    } else {
        console.log('Email sent: ' + info.response);
    }
});