1. Reading Website Data with XMLHttpRequest

      var xhttp = new XMLHttpRequest();
      xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
          document.getElementById("output").innerHTML = this.responseText;
        }
      };
      xhttp.open("GET", "data/simpleMenu.json", true);
      xhttp.send();