ext 怎么通过radio的inputvalue得到boxlabel值

我想通过radio的inputvalue得到相应的boxlabel，应该怎么得呢

小例子代码 关键是找到 然后遍历[code="java"] <br> Ext.onReady(function(){</p> <pre><code>var form = new Ext.form.FormPanel({ labelAlign: &#39;right&#39;, title: &#39;form&#39;, labelWidth: 50, frame:true, width: 280, </code></pre> <p>defaults: {xtype:&#39;radio&#39;},<br> hideLabels: true,<br> items: [<br> {boxLabel: &#39;单选一&#39;, name: &#39;radio&#39;, inputValue: &#39;1&#39;, checked: true},<br> {boxLabel: &#39;单选二&#39;, name: &#39;radio&#39;, inputValue: &#39;2&#39;},<br> {boxLabel: &#39;单选三&#39;, name: &#39;radio&#39;, inputValue: &#39;3&#39;}<br> ],<br> buttons: [{<br> text: &#39;获得值是2的&#39;,<br> handler: function() {<br> var bl;<br><br> form.items.each(function(item){<br> if(item.getRawValue()==&quot;2&quot;){<br> bl=item.boxLabel;<br> }<br> })<br> alert(bl)<br> }<br> }]<br> });<br> form.render(&quot;form&quot;);</p> <p>});<br>