如何根据敲除js中的ajax响应更新视图模型？

Question

我有一个状态的viewmodel，其中我有五个字段，其中五个字段是隐藏字段。我希望每当我触发ajax请求时都会更新。我的servlet响应一个值。我希望在ajax响应的基础上更新此值。这是我的viewmodel

var dummyData = [{ "nsc": "1", "name": "us", "bic": "united states", "identifier": "us" }, { "nsc": "2", "name": "europe", "bic": "europe", "identifier": "us" }, { "nsc": "3", "name": "aus", "bic": "aus", "identifier": "us" }];
function State(data) {
    this.nsc = ko.observable(data.nsc || "");
    this.nscto = ko.observable(data.nscto || "");
    this.bic = ko.observable(data.bic || "");
    this.name = ko.observable(data.name || "");
    this.hiddenField = ko.observable(data.identifier || "");
}
function StateViewModel() {
    var self = this;
    self.States = ko.observableArray([]);
    self.PopulateStates = ko.computed(function () {
        ko.utils.arrayForEach(dummyData, function (item) {
            self.States.push(new State(item));
        });
    });
    self.nsc = ko.observable();
    self.nscto = ko.observable();
    self.bic = ko.observable();
    self.hiddenField = ko.observable();
    self.name = ko.observable();
}

这是我正在制作ajax请求的addState函数

self.addState = function (state) {
    var stateData = ko.toJSON({ data: new State({ nsc: self.nsc(), nscto: self.nscto(), bic: self.bic(), name: self.name() }) });
    $.ajax
        ({
            data: "action=" + "addarea" + "&jsonData=" + stateData,
            url: '/bin/stateUpdate/add',
            dataType: 'json',
            type: 'GET',
            success: function (data) {
                var identifier = data['identifier'];
                alert(identifier); // checking servlet reponse
                self.hiddenField(identifier);
                self.States.push(new State({
                    nsc: self.nsc(),
                    nscto: self.nscto(),
                    bic: self.bic(),
                    name: self.name(),
                    hiddenField: self.hiddenField(identifier)
                }));
            },

            error: function (exception) {
                alert("fail");

            }
        });

    /* $.post("/bin/stateUpdate/add", stateData, function(returnedData) {
          bank.hiddenField(returnedData);
          })*/


};

我想根据从servlet获取的值来更新hiddenField.addstate函数在viewmodel中。当我尝试使用Knockout方法$ .post进行ajax请求时，我怎么能设置这个值，它不起作用。有人可以帮忙吗？