在javascript中我想判断用户选择了哪个radio应该怎么写？

[fys_syf]

在javascript中我想判断用户选择了哪个radio应该怎么写？

[karma]

<form name="frmtest">
<input type="radio" name="rdo" value="1">1<br>
<input type="radio" name="rdo" value="2">2<br>
<input type="radio" name="rdo" value="3">3<br>
<input type="radio" name="rdo" value="4">4<br>
<input type="radio" name="rdo" value="5">5<br>
<input type="button" value="Get Radio Value" onclick="getRadio()">
</form>
<script language="javascript">
function getRadio()
{
var radios = document.frmtest.rdo;
if (radios)
{
var len = radios.length;
if (len)
{
for (var i=0; i < len; i++)
{
if (radios[i].checked)
{
alert("checked radio has a value of " + radios[i].value);
break;
}
}

if (i==len)
alert("no radio is checked");
}
else
{
if (radios.checked)
alert("checked radio has a value of " + radios.value);
else
alert("not checked");
}
}
else
alert("No radios");

}
</script>

[fys_syf]

谢谢我明白了。（：