regist.js

const regist = function (code) {
    $.ajax({
        type: 'POST',
        url: `/chon-mon-hoc/${code}/1/2`,
        success: (a, b) => {
            commit(code);
        },
        error: (a, b) => {
            commit(code);
        },
    });
};

const commit = function (code) {
    $.ajax({
        type: 'POST',
        url: '/xac-nhan-dang-ky/1',
        success: (a, b) => {
            try {
                let t = Number.parseInt(
                    a.message.split('Đăng ký thành công ')[1]
                        .split(' ')[0]
                );
                if (t != end) {
                    regist(code);
                } else {
                    confirm('success');
                }
            } catch (e) {
                regist(code);
            }
        },
        error: function (a, b) {
            regist(code);
        }
    })
};