Javascript 树没有节点持久性

在我的ASP.NET项目中，我尝试使用一些DojoUI元素。我的第一次尝试是一个类似于dojo文档中所示的树。但在刷新浏览器页面后，树拒绝保留扩展节点的状态

require([
            "dojo/ready", "dojo/_base/window", "dojo/store/Memory",
            "dijit/tree/ObjectStoreModel", "dijit/Tree"
        ], function (ready, win, Memory, ObjectStoreModel, Tree) {

            // Create test store, adding the getChildren() method required by ObjectStoreModel
            var myStore = new Memory({
                data: [
                    { id: 'world', name: 'The earth', type: 'planet', population: '6 billion' },
                    { id: 'AF', name: 'Africa', type: 'continent', parent: 'world'
                    },
                        { id: 'EG', name: 'Egypt', type: 'country', parent: 'AF' },
                        { id: 'KE', name: 'Kenya', type: 'country', parent: 'AF' },
                            { id: 'Nairobi', name: 'Nairobi', type: 'city', parent: 'KE' },
                            { id: 'Mombasa', name: 'Mombasa', type: 'city', parent: 'KE' },
                        { id: 'SD', name: 'Sudan', type: 'country', parent: 'AF' },
                            { id: 'Khartoum', name: 'Khartoum', type: 'city', parent: 'SD' },
                    { id: 'AS', name: 'Asia', type: 'continent', parent: 'world' },
                        { id: 'CN', name: 'China', type: 'country', parent: 'AS' },
                        { id: 'IN', name: 'India', type: 'country', parent: 'AS' },
                        { id: 'RU', name: 'Russia', type: 'country', parent: 'AS' },
                        { id: 'MN', name: 'Mongolia', type: 'country', parent: 'AS' },
                    { id: 'OC', name: 'Oceania', type: 'continent', population: '21 million', parent: 'world' },
                    { id: 'EU', name: 'Europe', type: 'continent', parent: 'world' },
                        { id: 'DE', name: 'Germany', type: 'country', parent: 'EU' },
                        { id: 'FR', name: 'France', type: 'country', parent: 'EU' },
                        { id: 'ES', name: 'Spain', type: 'country', parent: 'EU' },
                        { id: 'IT', name: 'Italy', type: 'country', parent: 'EU' },
                    { id: 'NA', name: 'North America', type: 'continent', parent: 'world' },
                    { id: 'SA', name: 'South America', type: 'continent', parent: 'world' }
                ],
                getChildren: function (object) {
                    return this.query({ parent: object.id });
                }
            });

            // Create the model
            var myModel = new ObjectStoreModel({
                store: myStore,
                query: { id: 'world' }
            });

            // Create the Tree.   Note that all widget creation should be inside a dojo.ready().
            ready(function () {
                var tree = new Tree({
                    model: myModel,
                    persist: true
                });
                tree.placeAt("tree2");
                tree.startup();
            });
        });
    </script>

    <div id="tree2"></div>

需要([
“dojo/ready”、“dojo/_base/window”、“dojo/store/Memory”，
“dijit/tree/ObjectStoreModel”、“dijit/tree”
]，函数（就绪、win、内存、ObjectStoreModel、树）{
//创建测试存储，添加ObjectStoreModel所需的getChildren（）方法
var myStore=新内存({
数据：[
{id:'世界'，名称：'地球'，类型：'行星'，人口：'60亿'}，
{id:'AF'，name:'Africa'，type:'constance'，parent:'world'
},
{id:'EG'，name:'埃及'，type:'country'，parent:'AF'}，
{id:'KE'，name:'Kenya'，type:'country'，parent:'AF'}，
{id:'Nairobi'，name:'Nairobi'，type:'city'，parent:'KE'}，
{id:'Mombasa'，name:'Mombasa'，键入：'city'，父项：'KE'}，
{id:'SD'，name:'Sudan'，type:'country'，parent:'AF'}，
{id:'Khartoum'，name:'Khartoum'，键入：'city'，父项：'SD'}，
{id:'AS'，name:'Asia'，type:'constance'，parent:'world'}，
{id:'CN'，name:'China'，type:'country'，parent:'AS'}，
{id:'IN'，name:'India'，键入：'country'，parent:'AS'}，
{id:'RU'，name:'rusia'，键入：'country'，父项：'AS'}，
{id:'MN'，name:'蒙古'，type:'country'，parent:'AS'}，
{id:'OC'，名称：'Oceania'，类型：'Continental'，人口：'2100万'，父母：'world'}，
{id:'EU'，name:'Europe'，type:'continent'，parent:'world'}，
{id:'DE'，name:'dermany'，type:'country'，parent:'EU'}，
{id:'FR'，name:'France'，type:'country'，parent:'EU'}，
{id:'ES'，name:'spaine'，type:'country'，parent:'EU'}，
{id:'IT'，name:'Italy'，type:'country'，parent:'EU'}，
{id:'NA'，name:'North America'，type:'constance'，parent:'world'}，
{id:'SA'，name:'South America'，键入：'Continental'，父级：'world'}
],
getChildren:函数（对象）{
返回this.query（{parent:object.id}）；
}
});
//创建模型
var myModel=新的ObjectStoreModel({
商店：myStore，
查询：{id:'world'}
});
//创建树。注意，所有小部件的创建都应该在dojo.ready（）中。
就绪（函数（）{
var-tree=新树({
型号：myModel，
坚持：对
});
tree.placeAt（“tree2”）；
tree.startup（）；
});
});

---

Cookies被激活。我希望这一切发生在客户方。使用chrome、firefox和IE进行了尝试。

树的id丢失。有了id，它就可以工作了：

var tree = new Tree({
    id: "yourtree",
    model: myModel,
    ....

---

是什么让您认为在页面刷新后，树将保持展开/收缩状态？您是否有指向该功能的链接？