Can we use jquery ajax call in master page?

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ASP.NET

I Want Ajax Request In Master page. But its doesn't called the ajax Call.Can u please advice me.

What I have tried:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="http://cdn.jsdelivr.net/json2/0.1/json2.js"></script>
<script type="text/javascript">
$(function () {
$("[id*=btnSignup]").bind("click", function () {
var user = {};
user.Firstname = $("[id*=txtFName]").val();
user.Lastname = $("[id*=txtLname]").val();
user.Email = $("[id*=txtEmail]").val();
user.Mobile = $("[id*=txtMobile]").val();
user.Password = $("[id*=txtPassword]").val();
$.ajax({
type: "POST",
url: "EventFront.Master/SaveUser",
data: '{user: ' + JSON.stringify(user) + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
alert("User has been added successfully.");
window.location.reload();
}
});
return false;
});
});
</script>