从动态文本框读取值

// HTML
<input type="text" id="myInput" />

// JavaScript
var inputElement = document.getElementById("myInput");
inputElement.addEventListener("input", function() {
  var value = inputElement.value;
  console.log("用户输入的值为：" + value);
});

// 安装依赖：npm install express body-parser

// JavaScript
const express = require("express");
const bodyParser = require("body-parser");

const app = express();
app.use(bodyParser.urlencoded({ extended: true }));

app.post("/submit", function(req, res) {
  var value = req.body.myInput;
  console.log("用户输入的值为：" + value);
  res.send("提交成功！");
});

app.listen(3000, function() {
  console.log("服务器已启动，监听端口3000...");
});