写了一个JS脚本.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0025)http://127.0.0.1/test.asp -->
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<STYLE type=text/css>.unnamed1 {
FONT-SIZE: 10pt; TEXT-DECORATION: none
}
</STYLE>
<FORM name=forms>
<META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD>
<BODY>
<CENTER>
<DIV align=center><SPAN class=unnamed1>考试时间: <INPUT size=9 name=input1>
<SCRIPT language=javascript><!--
var sec=0;var min=0;var hou=0;flag=0;idt=window.setTimeout("update();",1000);function update(){sec++;if(sec==60){sec=0;min+=1;}if(min==60){min=0;hou+=1;}if((min>0)&&(flag==0)){flag=1;}
document.forms.input1.value=hou+"时"+min+"分"+sec+"秒";idt=window.setTimeout("update();",1000);}
//-->
</SCRIPT>
</SPAN></DIV></CENTER></FORM>
<FORM id=FORM1 name=FORM1 action=result.asp method=post>
<P align=center><SPAN class=unnamed1></SPAN>
<P align=center><SPAN class=unnamed1>
可怜的小猪2 </SPAN></P>
<DIV align=center>
<TABLE borderColor=#0099ff cellSpacing=1 cellPadding=1 width="35%" align=center
border=1>
<TBODY>
<TR bgColor=#99ccff>
<TD class=unnamed1 style="WIDTH: 50%" width="49%"><INPUT type=radio
value=A name=ans1> 没有原因 </TD></TR>
<TR bgColor=#ccccff>
<TD class=unnamed1 width="49%"><INPUT type=radio value=B name=ans1> 原因错误
</TD></TR>
<TR bgColor=#99ccff>
<TD class=unnamed1 width="51%"><INPUT type=radio value=C name=ans1> 的确错误
</TD></TR>
<TR bgColor=#ccccff>
<TD class=unnamed1 width="49%"><INPUT type=radio value=D name=ans1> 真的错误
</TD></TR></TBODY></TABLE><SPAN class=unnamed1></SPAN>
<P align=center><SPAN class=unnamed1>
第二题 </SPAN></P>
<DIV align=center>
<TABLE borderColor=#0099ff cellSpacing=1 cellPadding=1 width="35%" align=center
border=1>
<TBODY>
<TR bgColor=#99ccff>
<TD class=unnamed1 style="WIDTH: 50%" width="49%"><INPUT type=radio
value=A name=ans2> 1 </TD></TR>
<TR bgColor=#ccccff>
<TD class=unnamed1 width="49%"><INPUT type=radio value=B name=ans2 ID=ans2> 2
</TD></TR>
<TR bgColor=#99ccff>
<TD class=unnamed1 width="51%"><INPUT type=radio value=C name=ans2 ID=ans2> 3
</TD></TR>
<TR bgColor=#ccccff>
<TD class=unnamed1 width="49%"><INPUT type=radio value=D name=ans2 ID=ans2> 4
</TD></TR></TBODY></TABLE><SPAN class=unnamed1></SPAN></DIV>
<DIV align=center><SPAN class=unnamed1>
<P></P></SPAN></DIV>
<P align=center> </P>
<P align=center><SPAN class=unnamed1><INPUT id=submit1 name=submit1 type=submit value="提交" onclick="return chkradio()"> <INPUT id=reset1 type=reset value=重填 name=reset1> </SPAN></P></FORM>
<DIV align=center><SPAN class=unnamed1></SPAN></DIV></DIV></BODY></HTML>
<script language="Javascript">
function chkradio(){
var p = 3;
for (j=1;j<p;j++){
var aa = document.getElementsByName("ans"+[j]);
var ischecked = 0;
for (i=0;i<aa.length;++i){
if (aa[i].checked==true){
ischecked = 1;
break;
}
}
if (ischecked ==0){
alert("第"+(j)+"题没有被选中")
return false;
}
}
return true;
}
</script>