验证码不是不能更新，而是先要点击服务器控件刷新页面后才能更新（奇怪的不得不问高手）
如题，如果那样的话验证码的更新也没什么意思了，还不如按Ｆ５把代码贴在下面
<%@ Page Language= "C# " AutoEventWireup= "true " CodeFile= "Login.aspx.cs " Inherits= "admin_Login " %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml " >
<head runat= "server ">
<meta http-equiv= "Content-Language " content= "zh-cn " />
<title> 后台登录页面 </title>
<link href= "../Styleshop.css " rel= "stylesheet " type= "text/css " />
<style type= "text/css ">
.foot {
background-image: url( 'images/loginfoot.gif ');
}
.login {
text-align: right;
color:#008080;
height: 25px;
}
</style>
<script language = "javascript " type = "text/javascript " >
function getnewcode(Id)
{
document.getElementById (Id).src= "Images.aspx ";
}
</script>
</head>
<body>
<form id= "form1 " runat= "server ">
<div>
<table style= "width: 100%; height: 158px " cellspacing= "0 " cellpadding= "0 ">
<tr>
<td style= "height: 119px ">
<table style= "width: 100% " cellspacing= "0 " cellpadding= "0 " >
<tr>
<td colspan= "3 " style= "height: 70px "> </td>
</tr>
<tr>
<td colspan= "3 ">
<img alt= " " src= "images/login1.gif " width= "582 " height= "256 " /> </td>
</tr>
<tr>
<td> </td>
<td style= "height: 139px; width: 582px " class= "foot ">
<table style= "width: 100% " cellspacing= "0 " cellpadding= "0 " >
<tr>
<td style= "height: 25px; width: 195px " class= "login ">
用户名： </td>
<td style= "width: 200px ">
<asp:TextBox runat= "server " id= "TextName " BorderColor= "Teal " BorderWidth= "1px " BorderStyle= "Solid " Width= "130px ">
</asp:TextBox>
</td>
<td> </td>
</tr>
<tr>
<td style= "height: 25px; width: 195px " class= "login ">
密 码： </td>
<td style= "width: 200px ">
<asp:TextBox runat= "server " id= "TextPwd " BorderColor= "Teal " BorderWidth= "1px " TextMode= "Password " BorderStyle= "Solid " Width= "130px ">
</asp:TextBox>
</td>
<td> </td>
</tr>
<tr>
<td style= "height: 25px; width: 195px " class= "login ">
验证码： </td>
<td style= "width: 200px ">
<asp:TextBox runat= "server " id= "TextVerifyCode " BorderColor= "Teal " BorderWidth= "1px " BorderStyle= "Solid " Width= "130px ">
</asp:TextBox>
</td>
<td align= "left " >
<img id = "imgverify " alt = "点击刷新验证码图片 " src = "Images.aspx " onclick = "getnewcode( 'imgverify ') "/> </td>
</tr>
<tr>
<td style= "width: 195px "> </td>
<td style= "width: 200px ">
<asp:ImageButton runat= "server " id= "LoginBtn " ImageUrl= "images/loginbtn.gif " />
<asp:ImageButton runat= "server " id= "Clear " ImageUrl= "images/loginclear.gif " /> </td>
<td align= "left "> 点击刷新验证码 </td>
</tr>
</table>
</td>
<td> </td>
</tr>
</table>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
[解决办法]
Images.aspx里面写
Response.Expires = -100
[解决办法]
function getnewcode(Id)
{
document.getElementById (Id).src= "Images.aspx?t= "+(new Date()).getTime();
}
[解决办法]
Up一下。
[解决办法]
document.getElementById (Id).src= "Images.aspx?t= "+(new Date()).getTime();
加个随机参数
[解决办法]
是代码问题
