exttreenode

<script type="text/javascript">
        Ext.require([
            'Ext.tree.*',
            'Ext.data.*'
        ]);
        Ext.onReady(function () {
            var data = window.sessionStorage.getItem("data");
            if (data == null) {
                // 这里我自己做处理 这里为后台生成的树结构的json
                var json = "[{'id':'root','text':'所有车辆','leaf':false,'checked':false,'expanded':true,'icon':null,'children':[{'id':'G_161','text':'东风日产','leaf':false,'checked':false,'expanded':false,'icon':null,'children':[{'id':'V_1082','text':'24000001510','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]},{'id':'V_1064','text':'24000001350','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]}]},{'id':'G_160','text':'临沂','leaf':false,'checked':false,'expanded':false,'icon':null,'children':[{'id':'V_3274','text':'24000002013','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]},{'id':'V_2129','text':'24000003582','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]},{'id':'V_2128','text':'24000003644','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]},{'id':'V_2127','text':'24000003273','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]}]},{'id':'G_159','text':'美之高','leaf':false,'checked':false,'expanded':false,'icon':null,'children':[{'id':'V_1968','text':'24000001588','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]},{'id':'V_645','text':'24000001799','leaf':true,'checked':false,'expanded':false,'icon':'Images/car/car2_blue.png','children':[]}]}]}]";
                window.sessionStorage.setItem("data", json);
            }
            var newData = Ext.decode(data); // 这里为对象类型的数据，但不知道如何转化为自定义的node

            //这里需要你帮我看下如何处理获得store，用MemoryProxy，SessionStorageProxy还是LocalStorageProxy？
            var store = Ext.create('Ext.data.TreeStore', {
                root: {
                    expanded: true,
                    children: newData
                }
            });

            Ext.create('Ext.tree.Panel', {
                title: 'Simple Tree',
                width: 500,
                store: store,
                autoScroll: true,
                rootVisible: false,
                enableDD: true,

                renderTo: Ext.getBody()
            });
        });
    </script>