Ext Grid 相关有关问题，求指点，拜托

Ext.onReady(function(){
    var path = $("input[name=path]").val();
    
    var sm = new Ext.grid.CheckboxSelectionModel({
        
    });



    //问题在此处！！！          javascript代码没找到办法标红，请各位伤眼细看一下。谢谢
    //此函数的三个参数不清楚，求解释
    var oper = function( val, cellmeta, record ){
        alert(val + "     ---     " + record + "     ===     " + cellmeta);
        //var templateId = record.get('id');
        var delBtn="<button onclick='delFloatIp()'>删除</button>";
        var assignBtn="<button onclick='assignFloatIp()'>分配</button>";
        return delBtn + "&emsp;" + assignBtn;
    };



    var cm= new Ext.grid.ColumnModel([
        //sm,
         {header: 'IP', dataIndex: 'ip', width: 250, align:'center', sortable: true},
         {header: 'Instance', dataIndex: 'instance', width: 300, align:'center', sortable: true},
         {header: '操作', dataIndex: 'oper', width: 300, align:'center', renderer:oper}
     ]);
    var store = new Ext.data.JsonStore({
        url: path+'/internet/floating_list.action',
        autoLoad: true,
        totalProperty: 'totalCount',
           successProperty: 'success',
           root: 'list',
           baseParams: {start: 0, limit: 10},
           fields: [{name: 'id'},{name: 'ip'},{name: 'instance'}]
    });
    //页面布局部分
    var globalPanel = new Ext.Panel({
        height: 395,
        layout: 'border',
        border: false,
        items:[{
            split: true,
            width: 200,
            height: 200,
            split: true,
            region:'center',
            contentEl: 'queryGrid',                             
            border: false                              
        }]
    });
    var grid = new Ext.grid.GridPanel({
        title: '',
        stripeRows: true,
        loadMask: true,
        border: true,
        height: 395,
        cm: cm,
        //sm: sm,
        store: store,
        bbar: new Ext.PagingToolbar({   
            pageSize: 10,
            store: store,   
            displayInfo: true,   
            displayMsg: '<s:text name="iros.common.grid.record.note"/>',//'当前第 {0} - {1} 条记录 / 共 {2} 条',
            emptyMsg: '<s:text name="iros.common.grid.emptyMsg.note"/>'//目前无相关数据
        })
    });
    grid.render('queryGrid');
});