IIS hosted WCF, How to call in AJAX javascript

I am trying to call a IIS hosted Ajax Enabled WCF service from ASp.net page using javascript.

But I am not able to get the reference of the WCF service I have created and already hosted on IIS.  

If I try to access the WCF service by providing the URL of WCF i can get the correct result page but I can not get  reference in Javascipt.

my script manager code look like this

<asp:ScriptManager ID="ScriptManager1" runat="server">       <Services>         <asp:ServiceReference Path="http://localhost:8084/AjaxService.svc" />       Services>            asp:ScriptManager>