extjs 事件监听 三种方式

xtype : 'textarea',
name : 'dataSetField',
labelSeparator:'',
fieldLabel:'',
hideLabel: true,
allowBlank: true,
height: mainPanelHeight*0.8,
anchor:'99%',
listeners:{'blur':function(){
   alert(1);
}}

gridPanel.on('rowdblclick',function(gridPanel,_rowIndex,e){
  alert(2);
} 

gridPanel.addListener('rowclick',function(){
 alert(3)}
);