mvc c#中全局验证的问题

public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var cook = HttpContext.Current.Request.Cookies["cc"];
            if (IsLogin == false)
            {
                // 异步
                var res = HttpContext.Current.Response;
                if (HttpContext.Current.Request.Headers["X-Requested-With"] == "XMLHttpRequest")
                {
                    if (cook == null)
                    {
                                        //？？？？这里要怎么触发 父窗体的 js事件呢？？ 这样写毫无效果，一直纠结。
                        HttpContext.Current.Response.Write("<script>top.getElementById('ajaxon').onclick();</script>");
                        HttpContext.Current.Response.End();
                    }
                }
                // 同步
                if (HttpContext.Current.Request.Headers["X-Requested-With"] == null)
                {

                }
                return;
            }
        }

试试parent.document.getElementById("ajaxon");