轉自 司徒白的部落格 http://hkstb.blog.163.com/blog/static/4609679320091121102919550/
public class Alert
{
    public static void ShowAlert(string message)
    {
        if (message == null)
            message = "";
        //ljj
        //2005-12-9
        message = message.Replace("  ", "");
        System.Web.HttpContext.Current.Response.Write("<script>alert('" + message + "');</script>");
    }
    public static void ShowAlert(string message, string url)
    {
        if (message == null)
            message = "";
        message = message.Replace("  ", "");
        System.Web.HttpContext.Current.Response.Write("<script>alert(" + message + ");location='" + url + "';</script>");
    }
    public static void ShowConfirmAlert(string message, string confirmurl, string cancelurl)
    {
        if (message == null)
            message = "";
        message = message.Replace("  ", "");
        System.Web.HttpContext.Current.Response.Write("<script Language=Javascript>if( confirm('" + message + "') ) {document.location.href='" + confirmurl + "'; } else { document.location.href='" + cancelurl + "' }</script>");
    }
    public static void ShowConfirmAlert(string message, string confirmurl)
    {
        if (message == null)
            message = "";
        message = message.Replace("  ", "");
        System.Web.HttpContext.Current.Response.Write("<script Language=Javascript>if( confirm('" + message + "') ) {document.location.href='" + confirmurl + "'; } else { window.history.back(); }</script>");
    }
    public static void Redirect(string url)
    {//
        //
        if (url == null || url.Length < 1)
            ShowAlert("重定向地址不能為空");
        else
            System.Web.HttpContext.Current.Response.Write("<script>location='" + url + "';</script>");
    }
    public static void SSOLoginRedirect(string url)
    {
        Redirect(url);
        //   if(url==null||url.Length<1)
        //    ShowAlert("重定向地址不能為空");
        //   else
        //    System.Web.HttpContext.Current.Response.Write("<script>if(window.parent!=window) window.parent.location=window.location; location='"+url+"';</script>");

    }