验证码功能解释: 1. 所在页面:application\admin\view\index\login.html 2. 代码:` <img src="{:rtrim('__PUBLIC__', '/')}/index.php?s=/captcha" width="100" height="30" onclick="this.src = '{:rtrim('__PUBLIC__', '/')}/index.php?s=/captcha&r=' + Math.random();"/>` 生成的HTML: `~img src="/index.php?s=/captcha" width="100" height="30" onclick="this.src = '/index.php?s=/captcha&r=' + Math.random();"~` 3:是否启用验证码的开关:application\config.php的 ``` //登录验证码 'login_captcha' => true, ```