php验证码, jquery, ajax验证码
可以点击刷新验证码,提交会验证
XML/HTML Code
- <div id="main">
- <div class="demo">
- <h3>1、数字验证码</h3>
- <p>验证码:<input type="text" class="input" id="code_num" name="code_num" maxlength="4" /><img src="code_num.php" id="getcode_num" title="看不清,点击换一张" align="absmiddle"></p>
- <p><input type="button" class="btn" id="chk_num" value="提交" /></p>
- </div>
- <div class="demo">
- <h3>2、数字+字母验证码</h3>
- <p>验证码:<input type="text" class="input" id="code_char" maxlength="4" /> <img src="code_char.php" id="getcode_char" title="看不清,点击换一张" align="absmiddle"></p>
- <p><input type="button" class="btn" id="chk_char" value="提交" /></p>
- </div>
- <div class="demo">
- <h3>3、中文验证码</h3>
- <p>验证码:<input type="text" class="input" id="code_zh" maxlength="4" /> <img src="code_zh.php" id="getcode_zh" title="看不清,点击换一张" align="absmiddle"></p>
- <p><input type="button" class="btn" id="chk_zh" value="提交" /></p>
- </div>
- <div class="demo">
- <h3>4、仿google验证码</h3>
- <p>验证码:<input type="text" class="input" id="code_gg" maxlength="4" /> <img src="code_gg.php" id="getcode_gg" title="看不清,点击换一张" align="absmiddle"></p>
- <p><input type="button" class="btn" id="chk_gg" value="提交" /></p>
- </div>
- <div class="demo">
- <h3>5、算术验证码</h3>
- <p>验证码:<input type="text" class="input" id="code_math" maxlength="4" /> <img src="code_math.php" id="getcode_math" title="看不清,点击换一张" align="absmiddle"></p>
- <p><input type="button" class="btn" id="chk_math" value="提交" /></p>
- </div>
- </div>
JS代码
JavaScript Code
- <script type="text/javascript">
- $(function(){
- //数字验证
- $("#getcode_num").click(function(){
- $(this).attr("src",'code_num.php?' + Math.random());
- });
- $("#chk_num").click(function(){
- var code_num = $("#code_num").val();
- $.post("chk_code.php?act=num",{code:code_num},function(msg){
- if(msg==1){
- alert("验证码正确!");
- }else{
- alert("验证码错误!");
- }
- });
- });
- //数字+字母验证
- $("#getcode_char").click(function(){
- $(this).attr("src",'code_char.php?' + Math.random());
- });
- $("#chk_char").click(function(){
- var code_char = $("#code_char").val();
- $.post("chk_code.php?act=char",{code:code_char},function(msg){
- if(msg==1){
- alert("验证码正确!");
- }else{
- alert("验证码错误!");
- }
- });
- });
- //中文验证码
- $("#getcode_zh").click(function(){
- $(this).attr("src",'code_zh.php?' + Math.random());
- });
- $("#chk_zh").click(function(){
- var code_zh = escape($("#code_zh").val());
- $.post("chk_code.php?act=zh",{code:code_zh},function(msg){
- if(msg==1){
- alert("验证码正确!");
- }else{
- alert("验证码错误!");
- }
- });
- });
- //google验证
- $("#getcode_gg").click(function(){
- $(this).attr("src",'code_gg.php?' + Math.random());
- });
- $("#chk_gg").click(function(){
- var code_gg = $("#code_gg").val();
- $.post("chk_code.php?act=gg",{code:code_gg},function(msg){
- if(msg==1){
- alert("验证码正确!");
- }else{
- alert("验证码错误!");
- }
- });
- });
- //算术验证
- $("#getcode_math").click(function(){
- $(this).attr("src",'code_math.php?' + Math.random());
- });
- $("#chk_math").click(function(){
- var code_math = $("#code_math").val();
- $.post("chk_code.php?act=math",{code:code_math},function(msg){
- if(msg==1){
- alert("验证码正确!");
- }else{
- alert("验证码错误!");
- }
- });
- });
- });
- </script>
code_num.php
PHP Code
- <?php
- session_start();
- getCode(4,60,20);
- function getCode($num,$w,$h) {
- $code = "";
- for ($i = 0; $i < $num; $i++) {
- $code .= rand(0, 9);
- }
- //4位验证码也可以用rand(1000,9999)直接生成
- //将生成的验证码写入session,备验证页面使用
- $_SESSION["freejs_num"] = $code;
- //创建图片,定义颜色值
- Header("Content-type: image/PNG");
- $im = imagecreate($w, $h);
- $black = imagecolorallocate($im, 0, 0, 0);
- $gray = imagecolorallocate($im, 200, 200, 200);
- $bgcolor = imagecolorallocate($im, 255, 255, 255);
- imagefill($im, 0, 0, $gray);
- //画边框
- imagerectangle($im, 0, 0, $w-1, $h-1, $black);
- //随机绘制两条虚线,起干扰作用
- $style = array (
- $black,
- $black,
- $black,
- $black,
- $black,
- $gray,
- $gray,
- $gray,
- $gray,
- $gray
- );
- imagesetstyle($im, $style);
- $y1 = rand(0, $h);
- $y2 = rand(0, $h);
- $y3 = rand(0, $h);
- $y4 = rand(0, $h);
- imageline($im, 0, $y1, $w, $y3, IMG_COLOR_STYLED);
- imageline($im, 0, $y2, $w, $y4, IMG_COLOR_STYLED);
- //在画布上随机生成大量黑点,起干扰作用;
- for ($i = 0; $i < 80; $i++) {
- imagesetpixel($im, rand(0, $w), rand(0, $h), $black);
- }
- //将数字随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成
- $strx = rand(3, 8);
- for ($i = 0; $i < $num; $i++) {
- $strpos = rand(1, 6);
- imagestring($im, 5, $strx, $strpos, substr($code, $i, 1), $black);
- $strx += rand(8, 12);
- }
- imagepng($im);
- imagedestroy($im);
- }
- ?>
chk_code.php
PHP Code
- <?php
- session_start();
- $action = $_GET['act'];
- $code = trim($_POST['code']);
- if($action=='num'){ //检验数字验证码
- if($code==$_SESSION["freejs_num"]){
- echo '1';
- }
- }elseif($action=='char'){
- if($code==$_SESSION["freejs_char"]){
- echo '1';
- }
- }elseif($action=='zh'){
- $code = uniDecode($code,'utf-8');
- $ses = iconv('gbk','utf-8',$_SESSION["freejs_zh"]);
- if($code==$ses){
- echo '1';
- }
- }elseif($action=='gg'){
- //echo $_SESSION["freejs_gg"];exit;
- if(strtolower($code)==$_SESSION["freejs_gg"]){
- echo '1';
- }
- }elseif($action=='math'){
- if($code==$_SESSION["freejs_math"]){
- echo '1';
- }
- }else{
- }
- //处理接收中文字符串
- function uniDecode($str, $charcode) {
- $text = preg_replace_callback("/%u[0-9A-Za-z]{4}/", toUtf8, $str);
- return mb_convert_encoding($text, $charcode, 'utf-8');
- }
- function toUtf8($ar) {
- foreach ($ar as $val) {
- $val = intval(substr($val, 2), 16);
- if ($val < 0x7F) { // 0000-007F
- $c .= chr($val);
- }
- elseif ($val < 0x800) { // 0080-0800
- $c .= chr(0xC0 | ($val / 64));
- $c .= chr(0x80 | ($val % 64));
- } else { // 0800-FFFF
- $c .= chr(0xE0 | (($val / 64) / 64));
- $c .= chr(0x80 | (($val / 64) % 64));
- $c .= chr(0x80 | ($val % 64));
- }
- }
- return $c;
- }
- ?>
其他的几个freejs.net并不免费提供,上面2个也使用的比较多
原文地址:http://www.freejs.net/article_biaodan_31.html