call-wcf-ajax-jquery.js

function cityClickJQuery()
{
    $.ajax({
        type: "POST",
        url: "http://localhost:65424/CityService.svc/DoWork",
        data: '{"userName":"'+$get("txtName").value+'"}',
        processData:false,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(data)
        {
            alert(data.d);
        }
    });
}