Extjs4.2 選擇器 Ext.ComponentQuery.query

1.基於xtype查找組件: var panels = Ext.ComponentQuery.query(‘panel’);
2.查找二級xtype：var buttons = Ext.ComponentQuery.query(‘panel button’);
3.基於屬性值檢索組件：var saveButton = Ext.ComponentQuery.query(‘button[action=”saveUser”]’);
4.混合查找組件：var buttonsAndTextfields = Ext.ComonentQuery.query(‘button, textfield’);
5.基於ID查找組件：var usersPanel = Ext.ComponentQuery.query(‘#usersPanel’);
6.基於組件的presence（不太明白這個應該怎麼翻譯）：var extraOptionsComponents = 7.Ext.ComponentQuery.query(‘component[extraOptions]’);
8.使用組件的成員方法查找：var validField = Ext.ComponentQuery.query(‘form > textfield{isValid()}’);

   1: var panels = Ext.ComponentQuery.query('panel');
   2: var buttons = Ext.ComponentQuery.query('panel button'); 
   3: var saveButton = Ext.ComponentQuery.query('button[action="saveUser"]');
   4: var buttonsAndTextfields = Ext.ComonentQuery.query('button, textfield');
   5: var usersPanel = Ext.ComponentQuery.query('#usersPanel');
   6: var extraOptionsComponents = Ext.ComponentQuery.query('component[extraOptions]');
   7: var validField = Ext.ComponentQuery.query('form > textfield{isValid()}');

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