其语法为:
ClientScript.RegisterStartupScript(this.GetType(), "", "alert('用户名或密码错误!');", true);
下面给出一个登录窗口点登陆后的单击按钮后台代码,用户名和密码都正确,转向admin.aspx 页面,否则错误弹出窗口
protected void LoginButton_Click1(object sender, EventArgs e) { if (UserName.Text.Trim().Equals("mr") && Password.Text.Trim().Equals("123")) { Session["username"] = UserName.Text.Trim(); if (RememberMe.Checked) { if (Request.Cookies["username"] == null) { Response.Cookies["username"].Expires = DateTime.Now.AddDays(30); Response.Cookies["userpwd"].Expires = DateTime.Now.AddDays(30); Response.Cookies["username"].Value = UserName.Text.Trim(); Response.Cookies["userpwd"].Value = Password.Text.Trim(); } } Response.Redirect("admin.aspx"); } else { ClientScript.RegisterStartupScript(this.GetType(), "", "alert('用户名或密码错误!');", true); } }