<script type="text/javascript">
function doTest(){
var value = $("input[name='dizhi'][type='radio']:checked").val();//獲得選中項的值
$('#a1').attr('href','shoppeisong.php?addid='+value+'');
}
</script>

<a id="a1" href="" class="bt" onclick="xx()">　下一步　</a>