同名radio的取值

http://www.ideagrace.com/html/doc/2005/08/04/00328.html

<input type=radio value="1" selected name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="???">

如何取sex的value?

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<script>
function aa()
{
l=document.getElementsByName("sex")
for(i=0;i<l.length;i++)
{
if(l[i].checked) alert(l[i].value)
}
}
</script>
<input type=radio value="1" selected name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="aa()">


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<input name=r type=radio value=1>
<input name=r type=radio value=2>
<input name=r type=radio value=3>
<input type=submit onclick="for(i=0;i<r.length;i++)alert(r[i].value)">

---------------------------------------------------------------

<input type=radio value="1" checked name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="for(var i=0;i<sex.length;i++){if(sex[i].checked)alert('your select:'+sex[i].value)}">
---------------------------------------------------------------

<input type=radio value="1" checked name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="for(i=0;i<sex.length;i++){if(sex[i].checked)alert(sex[i].value)}" value=sumit></body>

---------------------------------------------------------------

<input type=radio value="1" checked name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="for(i=0;i<sex.length;i++){if(sex[i].checked)alert(sex[i].value)}" value=sumit>

---------------------------------------------------------------

<input type=radio value="1" checked name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="for(i=0;i<sex.length;i++){if(sex[i].checked)alert(sex[i].value)}" value=submit>

---------------------------------------------------------------

<input type=radio value="1" selected name=sex>男
<input type=radio value="0" name=sex>女
<input type=button onclick="javascript:alert(sex.value)">