using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if(TextBox1.Text=="admin"&&TextBox2.Text=="123")
        {
            Response.Write("<script>alert('错误信息')</script>");
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
         
    }
}
真奇怪！在360浏览器能弹出对话框，在IE就不能!请各位大神解释解释！

ScriptManager.RegisterClientScriptBlock(this, GetType(), "key", "alert('" + E.Message + "');", true);这段代码试试看。你可以加群230138841