EXTJS表格行提示信息

										listeners: {
								            render: function(g){
								                    var view = g.getView();   
								                	var store = g.getStore();
								               		var rowTip = new Ext.ToolTip({
									                    target: view.mainBody,   
									                    delegate: '.x-grid3-row',
									                    trackMouse: true,     
									                    renderTo: document.body,
									                    listeners: {
									                        beforeshow: function updateTipBody(tip){
									                            var rowIndex = view.findRowIndex(tip.triggerElement);
									                            var record = store.getAt(rowIndex);
									                            tip.body.dom.innerHTML = record.data.measure;
									                        }
								                    }
								                });
								            }
								        }