If you want to just test the output of a service .Use fiddler and check the output or add a testclient and check the output.
If you want to call the service using Jquery. You could use something like this. You could change the type to "POST" if you are posting something to the server.
function CallService() {
var ajaxRequest = $.ajax({
type: "GET",
url: "http://localhost:36161/Service1.svc/EmployeeDetailsByEmpNoJson",
contentType: false,
processData: false
});
ajaxRequest.done(function (xhr, textStatus) {
alert(textStatus);
});
ajaxRequest.fail(function (xhr, textStatus) {
alert(textStatus);
});
}