xmlhttp入门简单例子

 Default.aspx 页中 <input id="Button1" type="button" value="button" onclick="return Button1_onclick()" />

<script type="text/javascript">
   function XmlPost()
       { 
        queryString="pwd=123&id=12345&UserName=张三&sex=nan";//参数
       
        //xmlhttp简单发送
        var xmlRequest = new ActiveXObject("Microsoft.XMLHTTP");//生成xmlhttp实例
        xmlRequest.open("POST","Default2.aspx",false);  //请求 fasle是同步执行
        xmlRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//发送头类型
        xmlRequest.send(queryString);//发送
       
        alert(xmlRequest.responseText); //显示返回的信息
       }

   function Button1_onclick() {
        XmlPost();
    
   }
      
    </script> 

Default2.aspx.cs中

 protected void Page_Load(object sender, EventArgs e)
    {
        //得到参数
        string strUserName = Request.Params["UserName"];
        string strPwd = Request.Params["pwd"];
        string strid = Request.Params["id"];
        string strsex=Request.Params["sex"];

        Response.Write("返回的信息： /n名字："+strUserName+"/n密码："+strPwd+"/n编号："+strid+"/n性别："+strsex);
        Response.Flush();
        Response.End();
    }