How can I set session variable with JavaScript

By using below code on button click I get the href attribute value, until this everything is fine but when I got my href link on button click we want to store it in the session variable (i.e. var href) because we also use this variable elsewhere. Please suggest me how to store JavaScript variable in session.?

<script>
        $(document).ready(function(){
            $('.button').click(function(){
                var href = $(this).val();
                alert(href);
            })
        });
    </script>
<button value="<?php echo $value['3']; ?>" class="button" style="background-color:#ff8c21;">Buy Now</button>

Answer

Please try it if you want to use session using jquery First include jquery-1.9.1.js and jquery.session.js

$(document).ready(function(){ 
    $('.button').click(function(){
        var href = $(this).val();
        $.session.set("yoursessioname", "storevalue");
    }) 
});
alert($.session.get("yoursessioname"));

more detail http://phprocks.letsnurture.com/create-session-with-jquery/