c# cookie的使用，以及与javascript cookie的交互

C#:
创建：
　　　　HttpCookie cookie = new HttpCookie("regID");
            cookie .Value = username;
            cookie .Expires = DateTime.Now.AddDays(1);
            Response.Cookies.Add(cookie);
创建有子键的：
Response.Cookies["user"]["userName"] = Server.UrlEncode("大西瓜");//使用UrlEncode是为了使用javascript取出时不是乱码
或： 
   HttpCookie cookie=new HttpCookie("user"); 
   cookie.Values["userName"] = "aaa";  //cookie.Values.Add("userName","aaa");
   cookie .Expires = DateTime.Now.AddDays(1);  
   Response.Cookies.Add(cookie) //Response.AppendCookie(cookie)  ;
消除：直接删除没法删，因为COOKIE创建以后就保存在用户机器上了而不是在服务端
       这样全部删除：     
　　 private HttpCookie cookie = null;
       private string cookieName = string.Empty;
       for (int i = 0; i < Request.Cookies.Count; i++)
        {
            cookieName = Request.Cookies[i].Name; 
            cookie = new HttpCookie(cookieName); 
            cookie .Expires = DateTime.Now.AddDays(-1);
            Response.Cookies.Add(cookie );
        }
      删除子键： 
   HttpCookie cookie; 
   cookie = Request.Cookies["userInfo"]; &nbs