// 示例代码
function sendEmail(to, subject, body) {
    var transporter = nodemailer.createTransport({
        service: 'qq',
        auth: {
            user: 'your-email@qq.com', 
            pass: 'your-auth-code' // QQ邮箱授权码
        }
    });

    var mailOptions = {
        from: 'your-email@qq.com',
        to: to,
        subject: subject,
        text: body
    };

    transporter.sendMail(mailOptions, function(error, info){
        if (error) {
            console.log(error);
        } else {
            console.log('Email sent: ' + info.response);
        }
    });
}