extjs最普通的grid

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<script>
Ext.onReady(function () {
    //1.定义Model
    Ext.define("MyApp.model.User", {
        extend: "Ext.data.Model",
        fields: [
            { name: 'name', type: 'string' },
            { name: 'age', type: 'int' },
            { name: 'phone', type: 'string' }
        ]
    });

    //2.创建store
    var store = Ext.create("Ext.data.Store", {
        model: "MyApp.model.User",
        data: [
            { name: "Tom", age: 5, phone: "123456" },
            { name: "Jerry", age: 3, phone: "654321" }
        ]
    });

    //3.创建grid
    var viewport = Ext.create("Ext.container.Viewport", {
        layout: "fit",
        items: {
            xtype: "grid",
            model: "MyApp.model.User",
            store: store,
            columns: [
                { text: '姓名', dataIndex: 'name' },
                { text: '年龄', dataIndex: 'age', xtype: 'numbercolumn', format: '0' },
                { text: '电话', dataIndex: 'phone' }
            ]
        }
    });

    //4.添加双击编辑
    var grid = viewport.down("grid");
    grid.on("itemdblclick", function (me, record, item, index, e, eopts) {
        //5.创建编辑表单
        var win = Ext.create("Ext.window.Window", {
            title: "编辑用户",
             300,
            height: 200,
            layout: "fit",
            items: {
                xtype: "form",
                margin: 5,
                border: false,
                fieldDefaults: {
                    labelAlign: 'left',
                    labelWidth: 60
                },
                items: [
                    { xtype: "textfield", name: "name", fieldLabel: "姓名" },
                    { xtype: "numberfield", name: "age", fieldLabel: "年龄" },
                    { xtype: "textfield", name: "phone", fieldLabel: "电话" }
                ]
            },
            buttons: [
                {
                    text: "保存", handler: function () {
                        win.down("form").updateRecord();
                        record.commit();
                        win.close();
                    }
                }
            ]
        });
        win.down("form").loadRecord(record);
        win.show();
    });
});
</script>