simple 控制器中 /** * 生成验证码 * @param viod */ public function verify() { $captcha = new \think\captcha\Captcha(); $captcha->fontSize = 20; $captcha->length = 4; $captcha->codeSet = '0123456789'; $captcha->useNoise = false; return $captcha->entry(); } <div class="layui-form-mid"> <span><img onclick="this.src='{:url("simple/verify")}'" alt="点击更换" title="点击更换" src="{:url('simple/verify')}"> </span> </div>