利用window.location.href取URL值及Session来判断是否满足条件

前台页面的后台加载时给个Session ，

Session["keycode"] = "Guankan";

    protected void Page_Load(object sender, EventArgs e)
    {
        Session["keycode"] = "Guankan";
        lblSum.Text = Application["count"].ToString();
        if (Convert.ToInt32(lblSum.Text) >= 100)
        {
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script languge='javascript'>alert('已经有"+lblSum.Text+"位同事在观看了，请稍候在观看，谢谢配合！');window.location.href='menu_sc.html'</script>");
        }
        
    }

后台页面的后台来判断是否有接收到Session,
没有就返回，有就继续执行语句。

    protected void Page_Load(object sender, EventArgs e)
    {
        

        if (Session["keycode"] == null || Session["keycode"].ToString() != "Guankan")
        {
            Response.Redirect("index.html");
        }
    }

前台Javascript判断URL路径，

<script type="text/JavaScript">
    setTimeout(detectEnd, 3000);

    function detectEnd() {
        if (document.getElementsByTagName("video")[0].src == "") {
            setTimeout(detectEnd, 3000);
        }
        else {
            if (document.getElementsByTagName("video")[0].addEventListener) {
                document.getElementsByTagName("video")[0].addEventListener('ended', myHandler, false);
            }
            else {
                document.getElementsByTagName("video")[0].attachEvent('ended', myHandler, false);
            }
            function myHandler(e) {
                window.location.href = "sign.aspx?success=1";
            }
        }
    }
</script>

录入页面获取后判断是否有含字段，

<script language="javascript" type="text/javascript">
        var url = window.location.href;
        if (url.toString().indexOf("success") == -1) {
            alert("您还没有观看视频，请重新观看再录入，谢谢！");
            window.location.href = "index.html";
        }
 </script>