如何在Node.js中获取post参数

const http = require('http');
const url = require('url');
const querystring = require('querystring');

http.createServer((req, res) => {
  // 处理请求
}).listen(3000);

http.createServer((req, res) => {
  if (req.method === 'POST') {
    let postData = '';
    req.on('data', chunk => {
      postData += chunk;
    });
    req.on('end', () => {
      // 解析POST参数
      const params = querystring.parse(postData);
      // 处理参数
      // ...
      // 返回响应
      res.writeHead(200, { 'Content-Type': 'text/plain' });
      res.end('POST参数获取成功');
    });
  } else {
    res.writeHead(405, { 'Content-Type': 'text/plain' });
    res.end('只支持POST请求');
  }
}).listen(3000);