做項目的時候寫了一個很笨的省市區三級聯動，還沒優化，先記錄一下：
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="jquery1.71/jquery-1.7.1.min.js"></script>
</head>
<body>
<div>
<select class="add-on" name="province" id="province"></select>
<select class="add-on" name="city" id="city"></select>
<select class="add-on" name="district" id="district"></select>
</div>
<script type="text/javascript">
data= new Object();
jQuery=$;
data.user_area={'province':[{'name_ch':'湖北','_id':100000},{'name_ch':'湖南','_id':200000}],
'city':[{'name_ch':'武漢','_id':101000,'fid':100000},
{'name_ch':'長沙','_id':201000,'fid':200000},
{'name_ch':'張家界','_id':200200,'fid':200000}],
'district':[{'name_ch':'武昌市','_id':100110,'fid':101000},
{'name_ch':'雨花區','_id':200210,'fid':201000},
{'name_ch':'桑植縣','_id':200220,'fid':200200},
{'name_ch':'慈利縣','_id':200210,'fid':200200}]};
console.log(data.user_area);
jQuery(document).ready(function(){
for (p in data.user_area['province']){
jQuery('#province').append('<option value='+data.user_area['province'][p]['_id']+'>'+data.user_area['province'][p]['name_ch']+'</option>')
}
for (c in data.user_area['city']){
if (data.user_area['city'][c]['fid'] == data.user_area['province'][0]['_id']){
jQuery('#city').append('<option value='+data.user_area['city'][c]['_id']+'>'+data.user_area['city'][c]['name_ch']+'</option>')
}
}
for (c in data.user_area['district']){
if (data.user_area['district'][c]['fid'] == data.user_area['city'][0]['_id']){
jQuery('#district').append('<option value='+data.user_area['district'][c]['_id']+'>'+data.user_area['district'][c]['name_ch']+'</option>')
}
}
selectArea(data);
function selectArea(data){
jQuery('#province').change(function(){
jQuery('#city').empty();
for (c in data.user_area['city']){
if (data.user_area['city'][c]['fid'] ==jQuery('#province').find('option:selected').val()) {
jQuery('#city').append('<option value='+data.user_area['city'][c]['_id']+'>'+data.user_area['city'][c]['name_ch']+'</option>')
}
}
jQuery('#district').empty();
for( d in data.user_area['district']){
if(data.user_area['district'][d]['fid']==jQuery('#city').find('option:selected').val()){
jQuery('#district').append('<option value='+data.user_area['district'][d]['_id']+'>'+data.user_area['district'][d]['name_ch']+'</option>')
}
}
});
jQuery('#city').change(function(){
jQuery('#district').empty();
for( d in data.user_area['district']){
if(data.user_area['district'][d]['fid']==jQuery('#city').find('option:selected').val()){
jQuery('#district').append('<option value='+data.user_area['district'][d]['_id']+'>'+data.user_area['district'][d]['name_ch']+'</option>')
}
}
});
}
});
</script>
</body>
</html>