Ext.form.RadioGroup

      var radiogroup = new Ext.form.RadioGroup({
            id:'sex',
          parentColor : true,
          fieldLabel:'性别',
           100,
          items: [{
              name: 'status',
              inputValue: '0',
              boxLabel: '男',
              checked: true
          }, {
              name: 'status',
              inputValue: '1',
              boxLabel: '女'
          }]
      });

Ext.getCmp('sex').items.each(function (item) {
     if (item.checked) {
        var sex =item.inputValue;
     }
 });