AJAX - 如何将值传递回服务器

// 创建一个新的 XMLHttpRequest 对象
var xhr = new XMLHttpRequest();

// 准备发送请求
xhr.open("POST", "your_server_url_here", true);

// 设置请求头
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

// 发送请求
xhr.send("key1=value1&key2=value2");

const express = require('express');
const bodyParser = require('body-parser');

const app = express();

app.use(bodyParser.urlencoded({ extended: false }));

app.post('/your_server_url_here', (req, res) => {
  const key1 = req.body.key1;
  const key2 = req.body.key2;

  // 处理数据并返回响应
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});