javascript和asp.net操作cookie

　　javascript的cookie和asp.net的cookie都是指向同一個東西。廢話不多說看例子。

1.用asp.net在後台寫入cookie，javascript前台讀取

    protected void Page_Load(object sender, EventArgs e)    {        HttpCookie cookie = new HttpCookie("MyCook");//初使化並設定Cookie的名稱        DateTime dt = DateTime.Now;        TimeSpan ts = new TimeSpan(0, 0, 1, 0, 0);//到期時間為1分鐘        cookie.Expires = dt.Add(ts);//設定到期時間        //string tmp = System.Web.HttpUtility.UrlEncode("中文", System.Text.Encoding.UTF8);        cookie.Values.Add("userid", "123");        cookie.Values.Add("userid2", "456");        Response.AppendCookie(cookie);    }

在前台javascript用javascript讀取

    <script type="text/javascript">        var allcookies = document.cookie;        function test() {            //alert(decodeURIComponent(allcookies));            alert(allcookies);        }    </script>

前端可以正常擷取資料

　　上面的例子彈出框的內容Mybook=userid=123&userid2=456

 但要注意在asp.net輸入中文的時候要轉成UTF-8碼

    protected void Page_Load(object sender, EventArgs e)    {        HttpCookie cookie = new HttpCookie("MyCook");//初使化並設定Cookie的名稱        DateTime dt = DateTime.Now;        TimeSpan ts = new TimeSpan(0, 0, 1, 0, 0);//到期時間為1分鐘        cookie.Expires = dt.Add(ts);//設定到期時間        string tmp = System.Web.HttpUtility.UrlEncode("中文", System.Text.Encoding.UTF8);        cookie.Values.Add("userid", tmp);        cookie.Values.Add("userid2", "中文");        Response.AppendCookie(cookie);    }

在前台用javascript直接讀取會獲得亂碼！

MyCook=userid=%e4%b8%ad%e6%96%87&userid2=涓枃

所以輸入中文時要

 

System.Web.HttpUtility.UrlEncode("中文", System.Text.Encoding.UTF8);

 

用javascript讀取時

decodeURIComponent(allcookies)

看例子（通過decodeURIComponent可以把中文正確的讀出來

decodeURIComponent(document.cookie);

MyCook=userid=中文&userid2=涓枃

2.用javascript在前台寫入cookie，asp.net後台讀取

前台代碼

 

document.cookie = "MyCook=userid=123&userid2=456"

 

後台代碼

        if (Request.Cookies["MyCook"] != null)        {            //Response.Write("Cookie中索引值為userid的值:" + Request.Cookies["MyCook"]["userid"]);//整行            //Response.Write("Cookie中索引值為userid2的值" + Request.Cookies["MyCook"]["userid2"]);            Response.Write(Request.Cookies["MyCook"].Value);//輸出全部的值        }