How to change URL without refreshing?

You can change the URL without refreshing  with  location.hash  .

For ex: facebook and twitter use this method.

http://twitter.com/#!/username

Browsers use the # symbol as page anchors and you create your own prefix to catch the URL like #!
You can  listen to URL with  window.onhaschange  to send a XHTTP request when it changes.

Example:

<script type="text/javascript"> 

window.onhashchange = function() {

    var link = location.hash.replace('#!','');

// add  your XHTTP request code here

    alert('URL changed. Your link is "'+ link +'"');

}

</script>

<a href="#!/en/home/">change url</a>

If you wish to check browsers' onhaschange capability, you can use the code below:

<script type="text/javascript">
if ("onhashchange" in window) { alert('location hash is enable!'); } 

</script>