这篇文章用XMLHTTP来实现Form的Method=Post.

ClientPost.htm

<script language="JavaScript">
function AddDataPost(sUserId,sUserName)
{
/*
 *--------------- AddDataPost(sUserId,sUserName) -----------------
 * AddDataPost(sUserId,sUserName)
 * 功能:通过XMLHTTP添加数据.相当于Form的Method=Post.
 * 参数:sUserId,字符串,发送条件.
 * 参数:sUserName,字符串,发送条件.
 * 实例:AddDataPost(document.all.userid.value,document.all.username.value);
 *--------------- AddDataPost(sUserId,sUserName) -----------------
 */
    var oBao = new ActiveXObject("Microsoft.XMLHTTP");
    //特殊字符：+,%,&,=,?等的传输解决办法.
    //Update:2004-6-1 12:22
    //escape(sUserId),escape(sUserName);
    sUserId = escape(sUserId);
    sUserName = escape(sUserName);
    var userInfo = "userid="+sUserId+"&username="+sUserName;
    oBao.open("POST","Server.asp",false);
    oBao.setRequestHeader("Content-Type","application/x-www-form-urlencoded")
    oBao.send(userInfo);
    //清空输入框数据.
    document.all.userid.value="";
    document.all.username.value="";
    //服务器端处理返回的是经过escape编码的字符串.
    alert(unescape(oBao.responseText))
}
</script>
<input type="button" onclick="AddDataPost(document.all.userid.value,document.all.username.value)" value="AddDataPost"><br>
userid:<input type="text" name="userid"><br>
username:<input type="text" name="username">

Server.asp  服务器端处理.

<% @Language="JavaScript" %>
<%
function OpenDB(sdbname)
{
/*
 *--------------- OpenDB(sdbname) -----------------
 * OpenDB(sdbname)
 * 功能:打开数据库sdbname,返回conn对象.
 * 参数:sdbname,字符串,数据库名称.
 * 实例:var conn = OpenDB("database.mdb");
 *--------------- OpenDB(sdbname) -----------------
 */
    var connstr = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source="+Server.MapPath(sdbname);
    var conn = Server.CreateObject("ADODB.Connection");
    conn.Open(connstr);
    return conn;
}
var sResult = "";
var oConn = OpenDB("data.mdb");
//相当于Form的Method=Post.
//相当于Form的Method=Post.
//特殊字符：+,%,&,=,?等的传输解决办法.客户端传输过来是经过escape编码的.
//所以服用器端应该先unescape解码.
//Update:2004-6-1 12:22
//unescape(Request.Form("userid")).....
//var userid = unescape(Request("userid"));
var userid = unescape(Request.Form("userid"));
var username = unescape(Request.Form("username"));
sResult = "userid:"+userid+"\nusername:"+username+"\n 添加成功."
var sql = "Insert into users(userid,username)Values('"+userid+"','"+username+"')";
oConn.Execute(sql);
Response.Write(escape(sResult));
%>

数据库设计
data.mdb
表users.
字段
id              自动编号
userid          文本
username        文本

表:users 数据:
id      userid          username