Ext.Data.Json

Code
 1             var dd = [["a", "BeiJing"], ["b", "ShangHai"], ["c", "Changsha"], ["d", "Changchun"], ["e", "Kunming"]];
 2             var data = new Ext.data.SimpleStore({
 3                 fields: ["name", "nick"],
 4                 data: dd
 5             });
 6             //alert(data.getAt(0).get("nick"));
 7 
 8             var json = { total: 2, rows: [{ name: "gzb", age: 20 }, { name: "gjh", age: 3}] };
 9 
10             var ds = new Ext.data.Store({
11                 //data: json,
12                 proxy: new Ext.data.MemoryProxy(json),
13                 reader: new Ext.data.JsonReader({
14                     totalProperty: "total",
15                     root: "rows",
16                     id: "id",
17                     fields: [{ name: "name" }, { name: "age"}]
18                 }
19                 )
20             });
21             ds.load();
22             //alert(ds.getCount());
23             var combobox = new Ext.form.ComboBox({ displayField: "name", forceSelection: true, triggerAction: 'all', mode: "local", store: ds, title: "Select City", selectOnFocus: true, valueNotFoundText: "NotFoundText", id: "abc" });
24             combobox.render(document.body);
25             var combobox2 = combobox.cloneConfig();
26             combobox2.title = "ad";
27             combobox2.render(document.body);