添加一个类：把下面的文件放在类中就可以了。 using System;using System.Web;using System.Data;using System.Data.SqlClient; public class MessageBox    {      public MessageBox()        {         }         /// 
        /// 警告框        /// 
        /// 警告字串        /// 
     
      警告框JS
             public void MsgBox(string _Msg)        {            string StrScript;            StrScript = ("");            System.Web.HttpContext.Current.Response.Write(StrScript);        }        /// 
        /// 一个含有“确定”、“取消”的警告框        /// 
        /// 警告字串        /// “确定”以后要转到预设网址        /// 
     
      警告框JS
             public void MsgBox1(string _Msg, string URL)        {            string StrScript;            StrScript = ("");            System.Web.HttpContext.Current.Response.Write(StrScript);                   }        /// 
        /// 一个含有“确定”，点击以后就转到预设网址的警告框        /// 
        /// 警告字串        /// “确定”以后要转到预设网址        /// 
     
      警告框JS
             public void MsgBox2(string _Msg, string URL)        {            string StrScript;            StrScript = ("");            System.Web.HttpContext.Current.Response.Write(StrScript);        }       public static void MsgBox22(string _Msg, string URL)      {          string StrScript;          StrScript = ("");          System.Web.HttpContext.Current.Response.Write(StrScript);      }        /// 
        /// 一个含有“确定”，点击关闭本页的警告框        /// 
        /// 警告字串        /// 
     
      警告框JS
             public void MsgBox3(string _Msg)        {            string StrScript;            StrScript = ("");            System.Web.HttpContext.Current.Response.Write(StrScript);        }        /// 
        /// 一个含有“确定”，点击返回先前的网页警告框        /// 
        /// 警告字串        /// 要倒退几步        /// 
     
      警告框JS
             public void alert_history(string _Msg, int BackLong)        {            string StrScript;            StrScript = ("");            System.Web.HttpContext.Current.Response.Write(StrScript);        }         /// 
        /// 一个含有“确定”，点击后关闭自己，刷新父窗口警告框        /// 
        /// 警告字串        /// 
     
      警告框JS
             public void alert_reloadwin(string _Msg)        {            string StrScript;            StrScript = ("");           System.Web.HttpContext.Current.Response.Write(StrScript);        }         /// 
        /// 弹出对话框        /// 
        /// 页面        /// message信息        public static void alert(System.Web.UI.Page page, string content)        {            page.ClientScript.RegisterStartupScript(page.GetType(), " ", "");        }         /// 
        /// 弹出对话框        /// 
        /// 页面        /// message信息        public static void alert(System.Web.UI.Page page, string content,String _daiMa)        {            page.ClientScript.RegisterStartupScript(page.GetType(), " ", "");        }       public static void alert(System.Web.UI.Page page, object _code)      {          page.ClientScript.RegisterStartupScript(page.GetType(), "onLoad", "");      }     }