如何在按下按钮后从javascript调用控制器

<button id="myButton">点击按钮</button>

var button = document.getElementById("myButton");
button.addEventListener("click", myFunction);

function myFunction() {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", "/controller-endpoint", true);
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      // 请求成功，执行相应操作
      var response = xhr.responseText;
      console.log(response);
    }
  };
  xhr.send();
}

const express = require("express");
const app = express();

app.get("/controller-endpoint", (req, res) => {
  // 执行相应的控制器逻辑
  res.send("控制器已成功调用");
});

app.listen(3000, () => {
  console.log("服务器已启动");
});