从单选按钮集中获取ID值

Question

我正在尝试获取一组单选按钮的ID.这是它的HTML.

<input id="1" type="radio" title="2" value="6/1/2010" name="vacationDay">
<input id="2" type="radio" title="2" value="6/2/2010" name="vacationDay">
<input id="3" type="radio" title="2" value="6/3/2010" name="vacationDay" checked='checked'>

这是我的Javascript.

var updateDay = $('input[name=vacationDay]:checked').val();

它返回所选单选按钮的值(6/3/2010).我想获得选中按钮(3)的ID.想法？

Answer 1

var $radio = $('input[name=vacationDay]:checked');
var updateDay = $radio.val();
var id = $radio.attr('id');

.attr()

Answer 2

   var btnId = $('input[name=vacationDay]:checked').attr('id');