{
   xtype: 'gridpanel',
   columns: [
       {text: 'NAME', dataIndex: 'name', width: 100},
       {text: 'SURNAME', dataIndex: 'surname', width: 100},
       {
           text: 'DELETE',
           align: 'center',
           xtype: 'actioncolumn',
           items: [
               {
                  xtype: 'button',
                  text: 'DELETE ME',
                  scale: 'small',
                  handler: function() {
                      alert("Hello World!");
                  }
               }
           ]
       }
   ]
}

下一次尝试:

{
   xtype: 'gridpanel',
   columns: [
       {text: 'NAME', dataIndex: 'name', width: 100},
       {text: 'SURNAME', dataIndex: 'surname', width: 100},
       {
          renderer: function(val,meta,rec) {
             // generate unique id for an element
             var id = Ext.id();
             Ext.defer(function() {
                Ext.widget('button', {
                   renderTo: Ext.query("#"+id)[0],
                   text: 'DELETE',
                   scale: 'small',
                   handler: function() {
                      Ext.Msg.alert("Hello World")
                   }
                });
             }, 50);
             return Ext.String.format('<div id="{0}"></div>', id);
          }
       }
   ]
}