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                <button id="btn">Запрос</button>
<div id="output"></div>


                button { padding: 10px; font-size: 1.6rem;}


                //когда страница загрузиться - повесить на кнопку обработчик события клик
window.addEventListener("load", function() {
  var btn = document.getElementById("btn");

  btn.addEventListener("click", getInfo);

function getInfo() {
  var xhr = new XMLHttpRequest(); //создаём новый экземляр объекта
  var protocol = "http://";
  var host = "";
  var resourcePath = "/file/test.php";
  var uri = protocol + host + resourcePath;
  //метод запроса, адрес URL ресурса, асинхроность/синхроность"GET", uri, false);//синхроно

  //отправка тела сообщения - в данном случаии оно пустое