Ext.form.RadioGroup

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

单选

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