Extjs添加悬浮提示

{
             configIndex: '2',
             dataIndex: 'RPT_NAME',
             align: 'left',
             width: 200,
             text: '名称',
             //flex: 1
             renderer: function (value, metaData, record, rowIndex, colIndex) {
                 metaData.tdAttr = 'qclass="x-tip" data-qtitle="名称：" data-qwidth="300" data-qtip="'
                         + value + '"';
                 return value;
             }
         }