thinkphp自带验证码全面解析

前端页面：

<div style="position:absolute;z-index:3;top:160px;left:180px;"><img style="cursor:pointer; " src="{:U('Verify')}" onclick="this.src=this.src+'?'+Math.random()" id="safecode" style="height:50px;width:70%;"/></div> //验证码判断public function Verify(){ob_clean();//显示验证码$cfg=array('codeSet' => '0123456789', // 验证码字符集合'imageH' => 25, // 验证码图片高度'imageW' => 80, // 验证码图片宽度'length' => 4, // 验证码位数'fontttf' => '4.ttf', // 验证码字体，不设置随机获取'fontSize' => 10, // 验证码字体大小(px)'useNoise' => false, // 是否添加杂点'useCurve' => false, // 是否画混淆曲线'bg' => array(226,229,236) //背景颜色);$very=new /Think/Verify($cfg);$very->entry();} //客户端通过ajax，实现校验验证码public function checkVerify(){$code = I('get.code');$very = new /Think/Verify();$key = $this->auth_my_code($very,$very->seKey);// 验证码不能为空$secode = session($key);//对$code进行加密，在比较校验if($this->auth_my_code($very,strtoupper($code)) == $secode['verify_code']) {echo json_encode(array('flag'=>1,'cont'=>'验证码正确'));}else{echo json_encode(array('flag'=>2,'cont'=>'验证码错误'));}}private function auth_my_code($vry,$str){$key = substr(md5($vry->seKey), 5, 8);$str = substr(md5($str), 8, 10);return md5($key . $str);}

以上验证码如果输入错误提交后不能自动刷新，对代码进行更改后：

location.href="/Login/Login";这样只能对整个页面刷新，提交表单的值可能会丢失，非常影响用户体验。

2.如果验证码输入错误，提交后自动刷新验证码。

else{$('#safecode').attr("src","/Login/Verify?"+Math.random());NewAlert(2,"验证码有误，请重新输入",null);code_ok = false;$('#verifyresult').html(msg.cont).css({'color':'red','font-size':'12px'}); }

3.以下为ajax提交验证码到后台校验：

<script type="text/javascript">$("#login_btn").click(function(){var username = $.trim($("#username").val());var password = $.trim($("#password").val());var code = $('#veri').val();if(username == ""){NewAlert(2,"请输入用户名",null);shutdown();return false;}else if(password == ""){NewAlert(2,"请输入密码",null);shutdown();return false;}else if(code==''){NewAlert(2,"请输入验证码",null);return false;}//ajax去服务器端校验$.ajax({url:"__CONTROLLER__/checkVerify",data:{'code':code},dataType:'json',success:function(msg){if(msg.flag==1){var data= {username:username,password:password};$.ajax({type:"POST",url:"{:U('Login/Login')}",data:data,dataType:"json",success:function(msg){if(msg.RespCode=='000'){shutdown();if(msg.org_code=='fcb'){location.href="/Invest/index?biao_type=cwb";}else{location.href="{$Think.config.VIP_URL}/Individual/index";}}else{NewAlert(2,msg.RespDesc,null);return false;}},error:function(){shutdown();},beforeSend: function() {Loading();},});}else{$('#safecode').attr("src","/Login/Verify?"+Math.random());NewAlert(2,"验证码有误，请重新输入",null);code_ok = false;$('#verifyresult').html(msg.cont).css({'color':'red','font-size':'12px'}); }}});}); </script>