Try this
<script type="text/javascript">
function getsession(){
var name = "<%= Session["test"]%>";
alert('Session value = >' + name );
};
</script>
OR you can try this
// To Read
$(function() {
//Set the value to session
$.session.set("userName", $("#uname").val());
//Get the value to session
alert($.session.get("myVar"));
});