HTML code

 <script type="text/javascript">
        Ext.onReady(function () {
            var myData = [
        ['Apple', 29.89, 0.24, 0.81, '9/1 12:00am'],
        ['Ext', 83.81, 0.28, 0.34, '9/12 12:00am'],
        ['Google', 71.72, 0.02, 0.03, '10/1 12:00am'],
        ['Microsoft', 52.55, 0.01, 0.02, '7/4 12:00am'],
        ['Yahoo!', 29.01, 0.42, 1.47, '5/22 12:00am']
    ];

            var ds = new Ext.data.Store({
                proxy: new Ext.data.MemoryProxy(myData),
                reader: new Ext.data.ArrayReader({ id: 0 }, [
            { name: 'company' },
            { name: 'price', type: 'float' },
            { name: 'change', type: 'float' },
            { name: 'pctChange', type: 'float' },
            { name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia' }
    ])
            });
            ds.load();

            var colModel = new Ext.grid.ColumnModel([
        { header: "Company", width: 120, sortable: true, dataIndex: 'company' },
        { header: "Price", width: 90, sortable: true, dataIndex: 'price' },
        { header: "Change", width: 90, sortable: true, dataIndex: 'change' },
        { header: "% Change", width: 90, sortable: true, dataIndex: 'pctChange' },
        { header: "Last Updated", width: 120, sortable: true,

            renderer: Ext.util.Format.dateRenderer('m/d/Y'), dataIndex: 'lastChange'
        }
    ]);

            var grid = new Ext.grid.Grid('grid-example', { ds: ds, cm: colModel });
            grid.render();
            grid.getSelectionModel().selectFirstRow();
        });

    </script>

确实对象…….???怎么回事？！！！