一个ajax无刷新的例子或者原理

//创建对象
function create_obj(){
    var http_request = false;    //开始初始化XMLHttpRequest对象
    if(window.XMLHttpRequest) { //Mozilla 浏览器
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {//设置MiME类别
            http_request.overrideMimeType("text/xml");
        }
    }
    else if (window.ActiveXObject) { // IE浏览器
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }    if (!http_request) { // 异常，创建对象实例失败
        return false;
    }    return http_request;
}//初始化、指定处理函数、发送请求的函数
//var postStr = "ACT=reply&bookid="+bookid+"&book_content="+ book_content;
//type:post or get
function send_request(http_request,url) {
    // 确定发送请求的方式和URL以及是否同步执行下段代码
    http_request.open("POST", url, true);
    http_request.send(null);
}function InsertFav(uid){
    var http_request = create_obj();
    var obj_Yz=document.getElementById('user_id');
    if(obj_Yz){
        if(obj_Yz.value.length>0){
           http_request.onreadystatechange = function(){
            if (http_request.readyState == 4) {
                if (http_request.status == 200) {
     var http_result = http_request.responseText;
     alert(http_result);
                 }
            }
        }
        send_request(http_request,"../../Ajax/Fav_Com_Shop.aspx?com_loginName="+uid);
    }
  }
}
protected void Page_Load(object sender, EventArgs e)
    {
        string com_loginName = string.Empty;
        if (Request.QueryString["com_loginName"] != null) com_loginName = Request.QueryString["com_loginName"].ToString();
        MyWebService myWebService = new MyWebService();
        if (Session["user_id"]!=null)
        {
            if (!myWebService.isExistFavCompany(com_loginName, Session["user_id"].ToString()))
            {
                if (myWebService.insertFavourite(com_loginName, 0, 0, 0, 0, 0, Session["user_id"].ToString(),0) > 0)
                {
                    Response.Write("收藏成功！");
                    Response.End();
                }
            }
            else
            {
                Response.Write("该商家已经在你的收藏中了！");
                Response.End();
            }
        }
        else
        {
            Response.Write("您还没有登陆，请先登陆！");
            Response.End();
        }
    }这是一个ajax无刷新插入数据的例子。
http://www.cnblogs.com/singlepine/articles/434373.html
小山的ajax无刷新树
用client-callack无刷新更新服务器Session。Default3.aspxpublic partial class Default3 : System.Web.UI.Page, ICallbackEventHandler //必须实现ICallbackEventHandler
{
    private string s;
    protected void Page_PreRender(object sender, EventArgs e)
    {
        string sb = "function changeSession(arg, context) {" + Page.ClientScript.GetCallbackEventReference(this, "arg", "clientCallback", "context", true) + "}";        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "callServerScript", sb, true);
        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "callbackScript", "function clientCallback(result) { alert(result); }", true);    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            Session["Test"] = "Original";
    }    #region ICallbackEventHandler 成员    public string GetCallbackResult()
    {
        return s;
    }    public void RaiseCallbackEvent(string eventArgument)
    {
        Session["Test"] = eventArgument;
        s = "Session change to " + eventArgument;
    }    #endregion
    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Write(Session["Test"].ToString()); //用于测试
    }
}<head runat="server">
    <title>无标题页</title>
<script language="javascript" type="text/javascript">
// <!CDATA[function Button1_onclick() {
    changeSession(document.getElementById('Text1').value, null);
}// ]]>
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Text1" type="text" /><input id="Button1" type="button" value="button" onclick="return Button1_onclick()" />
        <asp:Button ID="Button2" runat="server" Text="测试Session是否改变" OnClick="Button2_Click" />
    </div>
    </form>
</body>

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一个ajax无刷新的例子或者原理

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