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验证码无法改变的问题（验证码看不清，换一个，却不起作用）

2008-09-27 15:12 211 查看

页面代码如下：<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server"><title>无标题页</title><link href="../../css/style.css" rel="stylesheet" type="text/css" /><script language="javascript">function ChangeValidCode(){ document.getElementById("IMG1").src='../../Components/ValiadCode1.aspx';}
</script></head><body><form id="form1" runat="server"><div> <table width="267" border="0" align="center" cellpadding="0" cellspacing="2" bgcolor="#FFFFFF" height="145"> <tr> <td style="width: 69px"><div align="right">用户名: </div></td> <td> <input id="tbUserCode" type="text" runat="server" maxlength="36" class="inputBlur" onblur="this.className='inputBlur'" onfocus="this.className='inputFocus'" style="width:140px; height:17px;"/> <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="*" ControlToValidate="tbUserCode"></asp:RequiredFieldValidator> </td> </tr> <tr> <td style="width: 69px"><div align="right">密　码: </div></td> <td><input id="tbUserPwd" type="password" runat="server" maxlength="10" class="inputBlur" onblur="this.className='inputBlur'" onfocus="this.className='inputFocus'" style="width:140px; height:17px;"/> <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="*" ControlToValidate="tbUserPwd"></asp:RequiredFieldValidator></td> </tr> <tr> <td style="width: 69px"><div align="right">验证码: </div></td> <td><input id="tbValidCode" type="text" maxlength="4" runat="server" class="inputBlur" onblur="this.className='inputBlur'" onfocus="this.className='inputFocus'" style="width:43px; height:17px;"/> <img src="../../Components/ValiadCode1.aspx" name="IMG1" border="0" align="middle" id="IMG1" runat="server" /> <a href="javascript:ChangeValidCode();" title="看不清?点击更换显示验证码">看不清？</a> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="*" ControlToValidate="tbValidCode"></asp:RequiredFieldValidator></td> </tr> <tr> <td colspan="2" align="center" height="33"> <input id="ibtnLogin" type="submit" runat="server" value="登录" onserverclick="ibtnLogin_ServerClick" class="btn_L1" onMouseOver="this.className='btn_L2'" onMouseOut="this.className='btn_L1'"/> <input id="Button1" type="reset" runat="server" value="取消" class="btn_L1" onMouseOver="this.className='btn_L2'" onMouseOut="this.className='btn_L1'" /> </td> </tr> <tr id="trError"> <td colspan="2" align="center"> <asp:Label ID="lblCodeError" runat="server" Text="验证码错误！" ForeColor="red" Visible="false"></asp:Label> <asp:Label ID="lblPwdError" runat="server" Text="用户名或密码错误！" ForeColor="red" Visible="false"></asp:Label></td> </tr> </table></div></form></body></html>在点击“看不清”切换验证码时，验证码却不变化。查找资料原来是页面缓存引起的。解决办法：在url后边在加上一段话来改变提交时间。
例如：
var newUrl =
"原url"+"&timeStamp="+new Date().getTime();或者在IE设置中"检查所有网页的较新版本"构选"每次访问网页时检查"即可以达到目的了

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