function hide(){
for(i=0;i<form.select1.length;i++) {
if(form.select1[i].checked)
alert(document.form.select1[i].value);
}
}
for(i=0;i<form.select1.length;i++) {
if(form.select1[i].checked)
alert(document.form.select1[i].value);
}
}
<input type=radio name=select1 value="dfa">
<input type=radio name=select1 value="adsdfa">
<input type=radio name=select1 value="dasfdfa">
<input type=button onclick="javascript:hide();">
</form>
<SCRIPT LANGUAGE="JavaScript">
<!--
function hide(){
//alert(document.form.select1.value);
for(i=0;i<document.form.select1.length;i++)
if(document.form.select1[i].checked==true)
alert(document.form.select1[i].value);
}
//-->
</SCRIPT>
<input type=radio name=select1 value="dfa">
<input type=radio name=select1 value="adsdfa">
<input type=radio name=select1 value="dasfdfa">
<input type=button onclick="javascript:hide();">
</form>
<SCRIPT LANGUAGE="JavaScript">
<!--
function hide(){
var obj = form.select1
for (i=0;i<obj.length;i++){
if (obj[i].checked){
alert(obj[i].value);
return;
}
}
alert('你没选!');
}
//-->
</SCRIPT>