【IT168技术文档】
最近忙没时间详细解释，先把通用的源码贴出自己看。
出于对性能的考虑，把省市两级写成JS数组，把县区（镇）两级写在 Oracle 里。通过 JS 触发 C# 去读取数据库，然后将数据回传给 JS ，再绑定显示。
操作 <select> 采用更通用的 createElement() 而没有使用 options.add()
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Area.aspx.cs" Inherits="Area" %> <!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 runat="server"> <title>地区</title> </head> <body> <form id="form1" runat="server"> <table> <tr> <td> <select id="SF"> <option selected="selected">—请选择—</option> </select> </td> <td> <select id="CS"> <option selected="selected">—请选择—</option> </select> </td> <td> <select id="Xian"> <option selected="selected">—请选择—</option> </select> </td> <td> <select id="Zhen"> <option selected="selected">—请选择—</option> </select> </td> </tr> </table> <script type="text/javascript"> var aDQ=new Array(); aDQ[0]=["11","北京","0","bj"]; aDQ[1]=["12","天津","0","tj"]; aDQ[2]=["13","河北","0","hb"]; aDQ[3]=["14","山西","0","shang"]; aDQ[4]=["15","内蒙古","0","nmg"]; aDQ[5]=["21","辽宁","0","ln"]; aDQ[6]=["22","吉林","0","jl"]; aDQ[7]=["23","黑龙江","0","hlj"]; aDQ[8]=["31","上海","0","sh"]; 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