ExtJS 4.0 gridPanel 分页控件Ext.toolbar.Paging点击传参问题

Store.on('beforeload', function (s) {
            s.baseParams['Year'] = Ext.getCmp("year").getValue();
            s.baseParams['Month'] = Ext.getCmp("month").getValue();
            s.baseParams['fcno'] = Ext.getCmp("ruleid").getValue();
            var params = s.getProxy().extraParams;
            var p = { fcno: Ext.getCmp("ruleid").getValue(), Year: Ext.getCmp("year").getValue(), Month: Ext.getCmp("month").getValue() };
            Ext.apply(params, p);
        });
//在数据源加上beforeload方法，把参数合并下