验证码

<p>验证码</p>
<div><img id="yanz" src="{:captcha_src()}" alt="captcha" onclick="refreshVerify()" /></div>
<script>
    function refreshVerify() {
        var ts = Date.parse(new Date())/1000;
        d = $('#yanz').attr('src')+"?id="+ts;
        console.log(d);
        $('#yanz').attr("src",d );
    }
</script>

public function yana()
{
    //var_dump($_POST);die;
    if (!empty($_POST)) {

        $captcha = $_POST['yanz'];
        if (empty($captcha)) {
            return $this->error('验证码不能为空！');
        }
        $return_result = $this->validate(['captcha' => $captcha], [
            'captcha|验证码' => 'require|captcha'
        ]);
        if ($return_result === true) {
            return json(['msg' => 'b']);
        } else {
            return $this->error($return_result);
        }
    }

}