Jquery: Como carregar um conteúdo ajax?

 var xhttp = new XMLHttpRequest();
        xhttp.onreadystatechange = function() {
          if (xhttp.readyState == 4 && xhttp.status == 200) {
             
              var response = xhttp.responseText; 
              
              document.getElementById("div-teste").innerHTML = response;
                    
                      };
                      xhttp.open("GET", "teste.php", true);
                      xhttp.send();
                }