一个获取单选按钮值的简单代码

<script language="javascript">
function x()
{
    var group = document.getElementsByName('RadioGroup1');
    for(var i = 0; i< group.length; i++)
       if(group[i].checked)
           alert(group[i].value);
}
</script>

<form id="form1" name="form1" method="post" action="">
  <p>
    <label>
      <input name="RadioGroup1" type="radio" value="1" checked="checked" />
      一</label>
    <br />
    <label>
      <input type="radio" name="RadioGroup1" value="2" />
      二</label>
    <br />
    <label>
      <input type="radio" name="RadioGroup1" value="3" />
      三</label>
    <br />
  </p>
<input type="button" value="点我" onclick="x();" />
</form>