<script type="text/javascript">
        window.onload = function()
        {
            try
            {
                var xmlhttp = new XMLHttpRequest();
            }
            catch(e)
            {
                var xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
            }
            xmlhttp.open('GET','WebForm1.aspx',true);
            xmlhttp.setRequestHeader('COOKIE','author=Robin Chen');
            xmlhttp.onreadystatechange=function()
            {
                document.body.innerHTML+='<div>readyState:'+xmlhttp.readyState+'</div>';
                if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
                {
                    document.body.innerHTML+='<div>responseText:'+xmlhttp.responseText+'</div>';
                    //alert(xmlhttp.responseText);  //这句打印出来把前台页面都打印出来了
                }
            }
            xmlhttp.send();
        }
    </script>

string strName = HttpContext.Current.Request.QueryString["author"];  //这个author值得不到
string strRes = "This is the response from the server:\r\n" + "Hello, " + strName + "!";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Write(strRes);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();

    $(document).ready(function() {
        $.get("WebForm1.aspx",function(data){
            $("body").html(data);
        });
    });