JAVASCRIPT

AJAX - The XMLHttpRequest Object

// Create an XMLHttpRequest object
const xhttp = new XMLHttpRequest();

// Define a callback function
xhttp.onload = function() {
  // Here you can use the Data
}

// Send a request
xhttp.open("GET", "ajax_info.txt");
xhttp.send();

AJAX - XMLHttpRequest

xhttp.open("GET", "demo_get.asp");
xhttp.send();