How to change title dynamically via ajax request?

Question

JavaScript

Here is a JS example :

<br>
var url = "test.html";<br>
$('title').load('/'+url+' title');<br>

Outcome: nothing happens (
Help me figure it out)

Answer 1

var x=XMLHttpRequest();
x.open("get","test.html",true);
x.onload=function(){
document.title=x.responseText;
};
x.send(null);

If jQuery is included:
But connecting just for this is a crazy idea.