如何在node js中检查textbox id是否为空

const http = require('http');
const url = require('url');
const express = require('express');
const app = express();

app.post('/check-textbox', (req, res) => {
  const textboxId = req.body.textboxId; // 假设你使用了body-parser中间件来解析请求体
  if (textboxId) {
    res.send('文本框ID不为空');
  } else {
    res.send('文本框ID为空');
  }
});

const server = http.createServer(app);
const port = 3000;
server.listen(port, () => {
  console.log(`服务器正在监听端口 ${port}`);
});