попробуйте этот код:
function CallService() {
jQuery.support.cors = true;
$.ajax({
type: "POST",
url: "url/Service1.asmx/servicename",
dataType: "json",
data: "{}",
contentType: "application/json; charset=utf-8",
success: OnSuccess,
error: OnError
});
}
function OnSuccess(data, status) {
alert("success");
alert(data.d);
}
function OnError(request, status, error) {
alert(status);
}
$(document).ready(function () {
CallService();
});