前天面试的复试题中gird

Ext.onReady(function(){
    var cm = new Ext.grid.ColumnModel([
        new Ext.grid.RowNumberer(),
        {header:'employeeId',dataIndex:'employeeId',sortable:true },
        {header:'employeeName',dataIndex:'employeeName',sortable:true},
        {header:'employeebType',dataIndex:'employeebType',sortable:true },
        {header:'employeePhoto',dataIndex:'employeePhoto',sortable:true },
        {header:'employeeDate',dataIndex:'employeeDate',sortable:true },
        {header:'employeePlace',dataIndex:'employeePlace',sortable:true },
        {header:'employeeMarriage',dataIndex:'employeeMarriage',sortable:true },
        {header:'employeeIdCard',dataIndex:'employeeIdCard',sortable:true },
        {header:'employeeBirthPlace',dataIndex:'employeeBirthPlace',sortable:true },
        {header:'hireDate',dataIndex:'hireDate',sortable:true },
        {header:'outDate',dataIndex:'outDate',sortable:true },
        {header:'state',dataIndex:'state',sortable:true },
        {header:'position',dataIndex:'position',sortable:true },
        {header:'salary',dataIndex:'salary',sortable:true },
        {header:'account',dataIndex:'account',sortable:true},
        {header:'address',dataIndex:'address',sortable:true },
        {header:'telephone',dataIndex:'telephone',sortable:true },
        {header:'phone',dataIndex:'phone',sortable:true },
        {header:'email',dataIndex:'email',sortable:true }
    ]);

    var store= new Ext.data.Store({

        proxy:new Ext.data.HttpProxy({url:'GridServlet?method=list'}),
       //这里url不能用struts的方法，struts方法mapping forward会使out.print(jsonData)的数据无法被找到，而用servlet方法无返回值直接out.print(jsonData)就OK了，这问问题我搞了两天，害的我没完工
        reader:new Ext.data.JsonReader({}, //这里的root、totalProperty没搞定，加这俩参数就不显示数据了，真是的Ext的文档也够详细，网上也没有具体的例子看，如果哪位看到了帮忙解决一下啊
                [
                {name:'employeeId'},
                {name:'employeeName'},
                {name:'employeebType'},
                {name:'employeePhoto'},
                {name:'employeeDate'},
                {name:'employeePlace'},
                {name:'employeeMarriage'},
                {name:'employeeIdCard'},
                {name:'employeeBirthPlace'},
                {name:'hireDate'},
                {name:'outDate'},
                {name:'state'},
                {name:'position'},
                {name:'salary'},
                {name:'account'},
                {name:'address'},
                {name:'telephone'},
                {name:'phone'},
                {name:'email'}

            ])
        });
    store.load();
    var grid =  new Ext.grid.GridPanel({
        renderTo:'grid',
        title:'ExtJs TEST',
        store:store,
        cm:cm,
        loadMask:{msg:'正在加载数据……'},
        width:800,
        height:200


    });
    grid.render();

});