Component XTypes

//Explicit creation of contained Components:
var panel = new Ext.Panel({
   ...
   items: [
      new Ext.Button({
         text: 'OK'
      })
   ]
};   //Implicit creation using xtype:
var panel = new Ext.Panel({
   ...
   items: [{
      xtype: 'button',
      text: 'OK'
   }]

转载于:https://www.cnblogs.com/fanzi2009/archive/2009/12/01/1614941.html