">
            <a class="nav-link" th:href="@{/index}">
                <i class="fas fa-fw fa-tachometer-alt"></i>
                <span>返回主页</span></a>
        </li>

        <li class="nav-item">
            <a class="nav-link" th:href="@{knowledge/subject} + '?id=' + ${originSubject.id}">
                <i class="fas fa-fw fa-chart-area"></i>
                <span>课程内容</span></a>
        </li>

        <li class="nav-item">
            <a class="nav-link" th:href="@{subject/progress} + 