alert不弹出提示

public class BasePage:Page

{

    public BasePage()

    {

        //

        // TODO: 在此处添加构造函数逻辑

        //

    }

    /// <summary>

    /// 判断是否登录

    /// </summary>

    /// <param name="e"></param>

    protected override void OnInit(EventArgs e)

    {

        if (Request.Cookies["LOGUID"] == null)

        {

            Response.Write("<script language=javascript>alert('请先登录！!')</script>");

            Response.Redirect("~/login.aspx");

        }

        base.OnInit(e);

    }

}