<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>test.html</title>
        <meta charset="utf-8" />
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

<script src="http://apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>

    
    <script type="text/javascript">
$(function() {
  $("input[name='radio_button']").click(function(){
    //alert("d");
    $("#result").text($(this).val());//获取值
  });
});
</script>

  </head>

  <body>
    <div>
      <input type="radio" name="radio_button" value="radio_button_1"
        checked="checked" />
      <input type="radio" name="radio_button" value="radio_button_2" />
      <input type="radio" name="radio_button" value="radio_button_3" />
    </div>
    <hr />
    <div id="result"></div>
  </body>
</html>


说明：

<input type="radio" name="radio_button"
 <input type="radio" name="radio_button"