ext radiogroup如何取值和设值

 var radios = Ext.create('Ext.form.Panel', {
     title: 'RadioGroup Example',
     width: 300,
     height: 125,
     bodyPadding: 10,
     renderTo: Ext.getBody(),
     items:[{
         xtype: 'radiogroup',
         fieldLabel: 'Two Columns',
         // Arrange radio buttons into two columns, distributed vertically
         columns: 2,
         vertical: true,
         items: [
             { boxLabel: 'Item 1', name: 'rb', inputValue: '1' },
             { boxLabel: 'Item 2', name: 'rb', inputValue: '2', checked: true},
             { boxLabel: 'Item 3', name: 'rb', inputValue: '3' },
             { boxLabel: 'Item 4', name: 'rb', inputValue: '4' },
             { boxLabel: 'Item 5', name: 'rb', inputValue: '5' },
             { boxLabel: 'Item 6', name: 'rb', inputValue: '6' }
         ]
     }]
 });

里面有设置项，把checked设为true，拿值的话用
var val = radios.down('radiogroup').getValue()['rb'];

摘自百度问答，地址:https://zhidao.baidu.com/question/981847790759065939.html