示範地址：http://wlog.cn/code/jquery/liandong/demo.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>jQuery 二級聯動</title><script src="http://wlog.cn/lib/jquery/jquery-1.3.2.js" type="text/javascript"></script><script type="text/javascript"> $(document).ready(function(){ $("#province").change(function(){ $("#province option").each(function(i,o){ if($(this).attr("selected")) { $(".city").hide(); $(".city").eq(i).show(); } }); }); $("#province").change(); });</script></head><body> <select id="province"> <option>----請選擇省份----</option> <option>北京</option> <option>上海</option> <option>江蘇</option> </select> <select class="city"> <option>----請選擇城市----</option> </select> <select class="city" name="beijing"> <option>東城</option> <option>西城</option> <option>崇文</option> <option>宣武</option> <option>朝陽</option> </select> <select class="city" name="shanghai"> <option>黃浦</option> <option>盧灣</option> <option>徐匯</option> <option>長寧</option> <option>靜安</option> </select> <select class="city" name="jiangsu"> <option>南京</option> <option>鎮江</option> <option>蘇州</option> <option>南通</option> <option>揚州</option> </select></body></html>
原文地址：http://wlog.cn/javascript/jquery-select.html
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