<%
for (int j = 0; userList != null && j < userList.size(); j++) {
DynaBean user = (DynaBean) userList.get(j);
String userId = StringUtil.getStr(user.get("pk"));
String userName = StringUtil.getStr(user.get("cname"));
%>
<TR class="tr_form">
<TD height="24" class="txt">
<INPUT type="radio" name="userId" checked id="userId<%=j %>" value="<%=userId %>">
<%=userName %></TD>
</TR>
<%
}
%>
怎么让第一个默认选中