application\index\controller\Index.php
<?php
namespace app\index\controller;
use think\Controller;
class Index extends Controller
{
public function index()
{
return $this->fetch();
}
public function check($code='')
{
$captcha = new \think\captcha\Captcha();
if(!$captcha->check($code)) {
$this->error('验证码错误');
}else{
$this->success('验证码正确');
}
}
}
application\index\view\index\index.html
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<FORM method="post" action="{:url('check')}">
<p>
<input name="code" type="text" placeholder="请输入验证码" style="width: 100px;">
<span>
<img class="captcha" src="{:captcha_src()}" alt="请点击刷新验证码"
onclick="this.src='{:captcha_src()}'+'?'+Math.random()" />
</span>
</p>
<p style="margin-top: 30px;">
<input type="submit" class="button" value="提交">
</p>
</FORM>
</body>
</html>
效果图：