使用 vanilla JS ajax 發送數據並使用 Node api 讀取數據

Question

我的客戶端有這個代碼：

sendMail(e) {
    e.preventDefault();
    var name = document.getElementById('name').value;
    var contactReason = document.getElementById('contactReason').value;
    var email = document.getElementById('email').value;
    var additionalInfo = document.getElementById('additionalInfo').value;
    var body = {
        name: name,
        contactReason: contactReason,
        email: email,
        additionalInfo: additionalInfo,
    };
    console.log(body);
    fetch('http://localhost:4000/', {
        method: 'POST',
        body: body.toString(),
    }).then(r => console.log(r)).catch(e => console.log(e));
}

而這種作品。 它將對象記錄到控制台，並向后端發送一些內容。

這是我的節點調用：

var express = require('express');
var router = express.Router();
var cors = require('cors');
var app = express();
var bodyParser = require('body-parser');
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({extended: true}));
app.use(cors());
app.options('*', cors());

var a = '=';
router.post('/', (req, res, next) => {
        console.log('mailing');
        console.log(a);
        console.log(req.body);
        a += '=';
        var nodemailer = require('nodemailer');

        var transporter = nodemailer.createTransport({
            host: "smtp.gmail.com", // hostname
            auth: {
                user: '******',
                pass: '******'
            }
        });

        let mailOptions = {
            from: `${req.body.name} ${req.body.email}`, // sender address
            to: 'alexander.ironside@mygeorgian.ca', // list of receivers
            subject: 'Email from UczSieApp contact form', // Subject line
            text: 'Hello world ', // plaintext body
            html: `
                        <h4>Imie: ${req.body.name}</h4>
                        <h4>Email: ${req.body.email}</h4>
                        <h4>Powod kontaktu: ${req.body.contactReason}</h4>
                        <p>Wiadomosc: ${req.body.additionalInfo}</p>
                        `
        };

        // send mail with defined transport object
        transporter.sendMail(mailOptions, function (error, info) {
            if (error) {
                return console.log(error);
            }

            console.log('Message sent: ' + info.response);
        });
    }
);
module.exports = router;

那么代碼現在做了什么：

正在創建對象，一些東西（不確定到底是什么）正在發送到 Node 后端，並且正在發送一封電子郵件。 但是req.body被記錄為{} 。

我想做的事：

將發送到后端的值作為body讀取，並發送包含此數據的電子郵件。

我錯過了什么？

Answer 1

我使用 GET 而不是 POST 這解決了我的問題。 這是一種作弊，但它有效。

Answer 2

應該添加到獲取

            headers: {
              'Accept': 'application/json',
              'Content-Type': 'application/json'
            },

            body: JSON.stringify(body),

所有正確的代碼

前端

sendMail(e) {
    e.preventDefault();
    var name = document.getElementById('name').value;
    var contactReason = document.getElementById('contactReason').value;
    var email = document.getElementById('email').value;
    var additionalInfo = document.getElementById('additionalInfo').value;
    var body = {
        name: name,
        contactReason: contactReason,
        email: email,
        additionalInfo: additionalInfo,
    };
    console.log(body);
    fetch('http://localhost:4000/', {
        headers: {
          'Accept': 'application/json',
          'Content-Type': 'application/json'
        },

        body: JSON.stringify(body),
        method: 'POST',
    }).then(r => console.log(r)).catch(e => console.log(e));
}

后端

var express = require('express');
var router = express.Router();
var cors = require('cors');
var app = express();
var bodyParser = require('body-parser');
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({extended: true}));
app.use(cors());
app.options('*', cors());

var a = '=';
router.post('/', (req, res, next) => {
        console.log('mailing');
        console.log(a);
        console.log(req.body);
        a += '=';
        var nodemailer = require('nodemailer');

        var transporter = nodemailer.createTransport({
            host: "smtp.gmail.com", // hostname
            auth: {
                user: '******',
                pass: '******'
            }
        });

        let mailOptions = {
            from: `${req.body.name} ${req.body.email}`, // sender address
            to: 'alexander.ironside@mygeorgian.ca', // list of receivers
            subject: 'Email from UczSieApp contact form', // Subject line
            text: 'Hello world ', // plaintext body
            html: `
                        <h4>Imie: ${req.body.name}</h4>
                        <h4>Email: ${req.body.email}</h4>
                        <h4>Powod kontaktu: ${req.body.contactReason}</h4>
                        <p>Wiadomosc: ${req.body.additionalInfo}</p>
                        `
        };

        // send mail with defined transport object
        transporter.sendMail(mailOptions, function (error, info) {
            if (error) {
                return console.log(error);
            }

            console.log('Message sent: ' + info.response);
        });
    }
);
module.exports = router;