点击才出现验证码

% if request("cur_action")="add" then code=Request.Form("code") if code=empty then response.write "script LANGUAGE='javascript'alert('请输入验证码！');history.go(-1);/script" Session("GetCode")=empty response.End() elseif lcase(code)lcase(Session("GetCode")) then response.write "script LANGUAGE='javascript'alert('您输入验证码出错！');history.go(-1);/script" Session("GetCode")=empty response.End() Else Response.Write "scriptalert('登陆成功');history.back();/script" response.End() end if end if % form name="form" meth...<a href="https://www.tulaoshi.com/n/20160219/1604859.html" target="_blank">[ 查看全文 ]</a></p> <div class="img_yyy_2"> <span>2016-02-19</span> <i>标签:</i> <div class="yyy_2_a"><a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> </div> </div> </div> </div> <div class="xiangguan_gg xiangguan_reader clearfix"> <div class="xiang_892_1" style="width:1158px;"> <h3><a href="https://www.tulaoshi.com/n/20160219/1604859.html" target="_blank">点击才出现验证码</a>的相关文章</h3> </div> <div class="xiang_892_2" style="width:1158px;"> <ul id="loadmore_container" style="width:1158px;"> <li> <div class="xiang_892_2_1"><a href="/reader/1485186" target="_blank"><img src="https://img.tulaoshi.com/201601/29/4dbd03507be90dd44b7deea360170a62_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160129/1485186.html" target="_blank">JSP彩色验证码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/java/" target="_blank">Java</a> <a href="https://www.tulaoshi.com/javajichu/" target="_blank">JAVA基础</a></div> <div class="span_em_123"> 生成有4个随机数字和杂乱背景的图片，数字和背景颜色会改变，服务器端刷新（用history.go(-1)也会变）原型参考ALIBABA http://china.alibaba.com/member/showimage 产生验证码图片的文件-----image.jsp <%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" % <%! Color getRandColor(int fc,int bc){//给定范围...<a href="https://www.tulaoshi.com/n/20160129/1485186.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/孙代西猛艳/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/6.jpg" /><span>孙代西猛艳</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">18</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1592500" target="_blank"><img src="https://img.tulaoshi.com/201602/19/a2d87e3716f0085fc400c3035c136392_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1592500.html" target="_blank">jsp 生成验证码代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">调用方法：在jsp页面用图像标签便可以直接调用如下是标签代码 img border=0 src="image.jsp",只需要把该代码发在验证码要显示的区域就可以了） %@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" % %! public static String code="abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Color getRandColor(int fc,int bc){//给定范围获...<a href="https://www.tulaoshi.com/n/20160219/1592500.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/波颖熙儿/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/10.jpg" /><span>波颖熙儿</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">8</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/187673" target="_blank"><img src="https://img.tulaoshi.com/201505/17/a17e633ada15decc642a463149f24a9f.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20150517/187673.html" target="_blank">12306图片验证码怎么样 12306验证码图片怎么用</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/ruanjianjc/" target="_blank">软件教程</a></div> <div class="span_em_123"> 12306验证码图片怎么样？就在前不久，不少使用12306抢票软件的人发现，所有的手机客户端产品以及PC用浏览器抢票软件均已失效。经了解，原来是12306官方网站验证码验证方式升级导致，那么12306验证码图片怎么用呢？这就需要用户们靠自己的眼力慢慢寻找了。第一步打开12306的官网，新版售票，点击进入：第二步：输入自己的账号和密码后，点击"开始验证&qu...<a href="https://www.tulaoshi.com/n/20150517/187673.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/信惠生活服务/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/23.jpg" /><span>信惠生活服务</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">28</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1507512" target="_blank"><img src="https://img.tulaoshi.com/201601/29/7c189a7904c8f70e014bb19e0b4d653d_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160129/1507512.html" target="_blank">无组件生成BMP验证码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/asp/" target="_blank">ASP</a></div> <div class="span_em_123"> Call Com_CreatValidCode("ValidCode") Sub Com_CreatValidCode(pSN) 'Author: Layen 'QQ: 84815733 'E-mail: support@ssaw.net ' 禁止缓存 Response.Expires = -9999 Response.AddHeader "Pragma","no-cache" Response.AddHeader "cache-ctrol","no-cache" Response.ContentType = "Image/BMP" Randomize Dim i, ii, iii Const cOdds = 8 ' 杂点出现的机率 Const cAmount = 36 ' 文字数量 Co...<a href="https://www.tulaoshi.com/n/20160129/1507512.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/渴望生活快乐11/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/12.jpg" /><span>渴望生活快乐11</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">36</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1603498" target="_blank"><img src="https://img.tulaoshi.com/201602/19/b482d9b22955edcd4fcda6b16cf83c2d_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1603498.html" target="_blank">在QQ空间操作中为什么会出现“验证码”？</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/diannaorumen/" target="_blank">电脑入门</a></div> <div class="span_em_123"> 验证码是为了保证用户的号码使用安全，防止盗号者恶意对您的帐号进行操作所设置。系统会根据您的QQ号码使用情况，若检测到QQ号码多次在不同的地方登录出现异常状况，便会提示验证码信息。同时若一个QQ号码在短时间内频繁发送大量的留言或者提交重复的留言等也会出现验证码的提示。对于在QQ空间操作中频繁出现验证码的情况，请您要提高警惕，为了您QQ号码的使用安全，建议电脑能定期查杀病毒和修改QQ密码，...<a href="https://www.tulaoshi.com/n/20160219/1603498.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/常女士8866/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/28.jpg" /><span>常女士8866</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">2</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1500446" target="_blank"><img src="https://img.tulaoshi.com/201601/29/499640f0e897eb95f0a92a55ebf5faf9_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160129/1500446.html" target="_blank">验证码的程序及原理</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/asp/" target="_blank">ASP</a></div> <div class="span_em_123"> 一共4个页面：form.asp; chk.asp; num.asp; count.asp 得到一个随即数字。加密！解密后成成XBM图片利用session 判断 form.asp ＜% '### To encrypt/decrypt include this code in your page '### strMyEncryptedString = EncryptString(strString) '### strMyDecryptedString = DeCryptString(strMyEncryptedString) '### You are free to use this code as long as credits remain in place ...<a href="https://www.tulaoshi.com/n/20160129/1500446.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/以撸的海角/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/26.jpg" /><span>以撸的海角</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">5</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1603969" target="_blank"><img src="https://img.tulaoshi.com/201602/19/0feb40ad7c7630123881d142f885ea37_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1603969.html" target="_blank">Jsp常用技巧:图片验证码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 思路：图片验证码的实现主要的技术点是如何生成一个图片。生成图片可以使用java.awt包下的类来实现。我们先写一个简单的生成图片的程序HelloImage.java。以下是代码部分。 package com.vogoal.test; import java.awt.Color; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; /** * @author SinNeR@blue...<a href="https://www.tulaoshi.com/n/20160219/1603969.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/徒步一直往前走/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/19.jpg" /><span>徒步一直往前走</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">22</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1494038" target="_blank"><img src="https://img.tulaoshi.com/201601/29/1b90fbaf0ab0a5fe8e8f4fac890f96bd_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160129/1494038.html" target="_blank">用PHP实现验证码功能</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/php/" target="_blank">PHP</a></div> <div class="span_em_123"> 作者:hutuworm 来源:糊涂馋寺 目前，不少网站为了防止用户利用机器人自动注册、登录、灌水，都采用了验证码技术。所谓验证码，就是将一串随机产生的数字或符号，生成一幅图片，图片里加上一些干扰象素（防止OCR），由用户肉眼识别其中的验证码信息，输入表单提交网站验证，验证成功后才能使用某项功能。 我们这里展示了如何编写PHP程序实现验证码功能： 代码一： &nb...<a href="https://www.tulaoshi.com/n/20160129/1494038.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/尼玛的优柔寡断/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/8.jpg" /><span>尼玛的优柔寡断</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">17</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1490856" target="_blank"><img src="https://img.tulaoshi.com/201601/29/246c22b756766b96f2ca5ac4bd020289_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160129/1490856.html" target="_blank">PHP 验证码登陆校验</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/php/" target="_blank">PHP</a></div> <div class="span_em_123"> 前几天看见DEV-CLUB实行了验证码登陆校验.昨晚在PHP中进行了实现.欢迎大家和我讨论polygame@163.net 原理:生成一个图片,并且保存图片中显示的字符到SESSION.在登陆时判断输入的校验码是否和SESSION中校验码相同. 演示地址: http://www.bingdu.net/bbs/ 这是生成校验码和图片的文件checkNumber.php <?php session_start(); if($act == "init") { &nbs...<a href="https://www.tulaoshi.com/n/20160129/1490856.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/大胖子小昊/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/6.jpg" /><span>大胖子小昊</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">15</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/5531" target="_blank"><img src="https://img.tulaoshi.com/201209/22/user201209221621496946.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20120922/5531.html" target="_blank">网页总是显示验证码错误</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/jsjyyjs/" target="_blank">计算机应用技术</a></div> <div class="span_em_123"> 第一步：在电脑桌面找到开始，点击运行。第二步：在运行命令行里面输入regsvr32 jscript.dll，确定。第三步：这时就会提示jscript.dll中的DllRegisterver成功，我们点击确定。第四步：打开运行命令，在里面输入regsvr32 vbscript.dll，确定。第五步：...<a href="https://www.tulaoshi.com/n/20120922/5531.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/ undefined/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/11.jpg" /><span> undefined</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">852</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1596694" target="_blank"><img src="https://img.tulaoshi.com/201602/19/be5ecc6e08f4af08f82e7f578886501a_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1596694.html" target="_blank">JSP彩色验证码的实例代码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123">image.jsp 代码如下： %@ page language="java" import="java.util.*" pageEncoding="GBK"% % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; % %@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" % %! Color getRandColor(int fc,int bc)...<a href="https://www.tulaoshi.com/n/20160219/1596694.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/压力山大8815/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/4.jpg" /><span>压力山大8815</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">19</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1507492" target="_blank"><img src="https://img.tulaoshi.com/201601/29/39f9611209d9848bb55ae757172aad30_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160129/1507492.html" target="_blank">ASP生成XBM图可用作验证码</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/asp/" target="_blank">ASP</a></div> <div class="span_em_123"> 这个程序主要是先生成一个随机数，然后根据生成的随机数经过变换后作为XBM图片的内容，最后显示这个图片. 验证时中要获取输入的数字和Session("validatecode")比较，如果相等则通过验证（还要注意一下相比较的两数据的类型保持一致）。如何显示生成的图片呢？ xbm.asp的代码如下程序代码：  <script type="text/javascript">tls.output.show_foot();</script> <div class="float_bottom" id="fixbottom" style="bottom:30px;"> <a href="https://m.tulaoshi.com//" class="icon_hu3">手机页面</a> <div class="float_bot_2"> <a href="javascript:;"id="show_search_input"> <input type="submit" class="input_sub" id="fixbottom_search_btn"> <input type="text" class="text_a_input" placeholder="输入你想搜索的关键词" style="display:none;" id="fixbottom_search_input"> </a> </div> <a href="javascript:;" class="icon_hu2" id="fav_site_btn" data-url="https://www.tulaoshi.com//">收藏网站</a> <a href="javascript:;" class="icon_hu" id="totop">回到头部</a> </div>  <script type="text/javascript" src="https://static.tulaoshi.com/js/zt.js"></script> </body> </html>