给你一段代码,你看一下吧
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
  <script type="text/javascript">
function checkdata(){
var obj_meisu = document.getElementsByName("meisu");
var obj_zirankexue = document.getElementsByName("zirankexue");
var is_meisu_Checked = false;
var is_zirankexue_Checked = false;
for(i=0;i<obj_meisu.length;i++){
if(obj_meisu[i].checked){
is_meisu_Checked = true;
break;
}
}
for(i=0;i<obj_zirankexue.length;i++){
if(obj_zirankexue[i].checked){
is_zirankexue_Checked = true;
break;
}
}
alert(is_meisu_Checked);
alert(is_zirankexue_Checked);
}
  </script>
 </HEAD> <BODY>
  <table>
  <tr> 
                                    <td   height= "30 "   align= "center "   bgcolor= "#FFFFFF "> <span   class= "STYLE6 "> 英语 </span> </td> 
                                    <td   height= "30 "   align= "center "   bgcolor= "#FFFFFF "> <input   name= "yingyu "   type= "text "   id= "yingyu "   size= "6 "   /> </td> 
                                    <td   align= "center "   bgcolor= "#FFFFFF "> <span   class= "STYLE6 "> 美术 </span> </td> 
                                    <td   align= "center "   bgcolor= "#FFFFFF "> <span   class= "STYLE6 "> 
                                        <input   type="radio"   name="meisu"   value= "radiobutton "   /> 
                                        优 
                                        <input   type="radio"   name="meisu"   value= "radiobutton "   /> 
                                        良 
                                        <input   type="radio"   name="meisu"   value= "radiobutton "   /> 
                                        及格 
                                        <input   type="radio"   name="meisu"   value= "radiobutton "   /> 
                                        不及格 </span> </td> 
                                </tr> 
                                <tr> 
                                    <td   height= "30 "   align= "center "   bgcolor= "#FFFFFF "> <span   class= "STYLE6 "> 语文 </span> </td> 
                                    <td   height= "30 "   align= "center "   bgcolor= "#FFFFFF "> <input   name= "yuwen "   type= "text "   id= "yuwen "   size= "6 "   /> </td> 
                                    <td   align= "center "   bgcolor= "#FFFFFF "> <span   class= "STYLE6 "> 自然科学 </span> </td> 
                                    <td   align= "center "   bgcolor= "#FFFFFF "> <span   class= "STYLE6 "> 
                                        <input   type="radio"   name="zirankexue"   value= "radiobutton "   /> 
                                        优 
                                        <input   type="radio"   name="zirankexue"   value= "radiobutton "   /> 
                                        良 
                                        <input   type="radio"   name="zirankexue"   value= "radiobutton "   /> 
                                        及格 
                                        <input   type="radio"   name="zirankexue"   value= "radiobutton "   /> 
                                        不及格 </span> </td> 
                                </tr>   </table>
  <input type="button" onclick="checkdata()" value="button" />
 </BODY>
</HTML>