这个不能使用 JS 来控件。
你是使用ASP.NET吧，ASP.NET里很控件实现。把登录的界面放在一个 Panel 控件里，把导航栏的内容放在另外一个 Panel 里面。然后在后台代码中判断用户是否登录，如果登记，就把导航栏所在的 Panel 显示，并把登录所在的 Panel 隐藏。
你是使用ASP.NET吧，ASP.NET里很控件实现。把登录的界面放在一个 Panel 控件里，把导航栏的内容放在另外一个 Panel 里面。然后在后台代码中判断用户是否登录，如果登记，就把导航栏所在的 Panel 显示，并把登录所在的 Panel 隐藏。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>index</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="新細明體">
<asp:Panel id="Panel1" style="Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 160px" runat="server"
Width="216px" Height="128px">
<P> </P>
<P>UID
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox></P>
<P>pwd
<asp:TextBox id="TextBox2" runat="server"></asp:TextBox>
<asp:Button id="Button1" runat="server" Text="Login"></asp:Button></P>
</asp:Panel>
<asp:Panel id="Panel2" style="Z-INDEX: 102; LEFT: 32px; POSITION: absolute; TOP: 160px" runat="server"
Width="216px" Height="128px">
<asp:Label id="Label1" runat="server">Label</asp:Label></asp:Panel></FONT>
</form>
</body>
</HTML>
//index.aspx.csusing System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;namespace javascriptAsp.net
{
/// <summary>
/// Summary description for index.
/// </summary>
public class index : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Panel Panel2;
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Button Button1;
private void Page_Load(object sender, System.EventArgs e)
{
if(Session["Loginner"]!=null)
{
this.Panel2.Visible = true;
this.Panel1.Visible = false;
}
else
{
this.Panel2.Visible = false;
this.Panel1.Visible = true;
}
// Put user code to initialize the page here
} #region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void Button1_Click(object sender, System.EventArgs e)
{
this.Panel1.Visible = false;
this.Panel2.Visible = true;
Session["Loginner"] = this.TextBox1.Text;
this.Label1.Text = this.TextBox1.Text+"登陸成功！";
}
}
}