Nasıl bir AJAX çağrısı kullanarak JavaScript, jQuery kullanmadan yapmak?

"Vanilya" JavaScript:

<script type="text/javascript">
function loadXMLDoc() {
    var xmlhttp;

    if (window.XMLHttpRequest) {
        // code for IE7 , Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    } else {
        // code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == XMLHttpRequest.DONE ) {
           if(xmlhttp.status == 200){
               document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
           }
           else if(xmlhttp.status == 400) {
              alert('There was an error 400')
           }
           else {
               alert('something else other than 200 was returned')
           }
        }
    }

    xmlhttp.open("GET", "ajax_info.txt", true);
    xmlhttp.send();
}
</script>

JQuery ile:

$.ajax({
    url: "test.html",
    context: document.body,
    success: function(){
      $(this).addClass("done");
    }
});