new Ext.data.JsonStore 加载后没有数据显示提示

var myData = {

            records : [

                { name : "Record 0", column1 : "0", column2 : "0" },

                { name : "Record 1", column1 : "1", column2 : "1" },

                { name : "Record 2", column1 : "2", column2 : "2" },

                { name : "Record 3", column1 : "3", column2 : "3" },

                { name : "Record 4", column1 : "4", column2 : "4" },

                { name : "Record 5", column1 : "5", column2 : "5" },

                { name : "Record 6", column1 : "6", column2 : "6" },

                { name : "Record 7", column1 : "7", column2 : "7" },

                { name : "Record 8", column1 : "8", column2 : "8" },

                { name : "Record 9", column1 : "9", column2 : "9" }

            ]

        };

        // Generic fields array to use in both store defs.

        var fields = [

            {name: 'name', mapping : 'name'},

            {name: 'column1', mapping : 'column1'},

            {name: 'column2', mapping : 'column2'}

        ];

        // create the data store

        var gridStore = new Ext.data.JsonStore({

            url:'http://localhost/extjs/examples/test/test.php', //使用远程的数据源。 如果使用url 则需要autoLoad一下。或者 store.load()

            autoLoad : true,

            fields : fields,

            // data : myData,    //使用上面的数据源。

            root : 'records'

        });

// gridStore.load();

// console.log(gridStore);

 

        // Column Model shortcut array

        var cols = [

            { id : 'name', header: "Record Name", width: 160, sortable: true, dataIndex: 'name'},

            {header: "column1", width: 50, sortable: true, dataIndex: 'column1'},

            {header: "column2", width: 50, sortable: true, dataIndex: 'column2'}

        ];

// console.log(gridStore,store) ;

        // declare the source Grid

        return new Ext.grid.GridPanel({

 

            ddGroup : 'gridDDGroup',

            store : gridStore,

            columns : cols,

            enableDragDrop : true,

            stripeRows : true,

            autoExpandColumn : 'name',

            width : 325,

            region : 'west',

            title : '参数列表',

            selModel : new Ext.grid.RowSelectionModel({singleSelect : true})

        });