1. 点击切换验证码
<img onclick="this.src=‘{:captcha_src()}?‘+Math.random()" src="{:captcha_src()}" alt="captcha" />
2.判断验证码
$captcha = new \think\captcha\Captcha(); if(!$captcha->check($data[‘code‘])){ return ‘验证码有误‘; }
原文：https://www.cnblogs.com/simadongyang/p/12220913.html