jsp页面循环中对radio赋初值

循环中动态生成radio按钮：

<logic:iterate id="list" name="tempList" >
       <tr >         
        <td class="input_td" align="center" width="3%">
              <input type = "radio" name="index" value = '<bean:write name="list" property="id" />' style="border:0" onclick="checkSelect()">
        </td></tr></logic:iterate>

 

 写在html之后：

<script language="javascript">
   if (window.document.forms[0].index[0] != undefined){
     window.document.forms[0].index[0].checked = true; 
     var selectValue = window.document.forms[0].index[0].value;
   }  
 </script>