var temp=Ext.create('Ext.grid.Panel', {                            title: title.substring(0,10),                            iconCls: 'icon-grid-list',                            id:id,                            forceFit: true,                            region : 'center',                            store: repStore,                            columnLines:true,                            closable:true,                            columns: [{dataIndex:'usernam',text:'姓名',align:'center'},{dataIndex:'itemtypename',text:'类型',align:'center'},                                      {dataIndex:'itemcontent',text:'内容',width:500,renderer: function(value, meta, record) {                                          meta.style = 'overflow:auto;padding: 3px 6px;text-overflow: ellipsis;white-space: nowrap;white-space:normal;line-height:20px;';                                             return value;                                        }},{dataIndex:'itemstaname',text:'状态',align:'center'}]                        });