course-tencent-cloud/public/static/home/js/captcha.login.js

layui.use(['jquery'], function () {

    var $ = layui.jquery;

    if ($('#captcha-btn').length > 0) {
        var captcha = new TencentCaptcha(
            $('#captcha-btn')[0],
            $('#captcha-btn').data('app-id'),
            function (res) {
                if (res.ret === 0) {
                    $('#ticket').val(res.ticket);
                    $('#rand').val(res.randstr);
                    $('#captcha-block').hide();
                    $('#submit-btn').removeClass('layui-btn-disabled').removeAttr('disabled');
                }
            }
        );
    }

});