li.nav-item
    a.nav-link(href='/poems') 背诗词
li.nav-item
    a.nav-link(href='/sensehat') Sense HAT
li.nav-item
li.nav-item.dropdown
    a.nav-link.dropdown-toggle(data-bs-toggle='dropdown', href='#', role='button', aria-haspopup='true', aria-expanded='false') 数学
    .dropdown-menu
        a.dropdown-item(href='http://nas:3000/zhao/math', target='_blank') 数学笔记
        a.dropdown-item(href='https://www.shuxuele.com/', target='_blank') 数学乐
li.nav-item.dropdown
    a.nav-link.dropdown-toggle(data-bs-toggle='dropdown', href='#', role='button', aria-haspopup='true', aria-expanded='false') 学习小组
    .dropdown-menu
        a.dropdown-item(href='/~xin/', target='_blank') 老爸
        a.dropdown-item(href='/~jun/', target='_blank') 鱼儿
        a.dropdown-item(href='/~yang/', target='_blank') 海洋
        .dropdown-divider
        a.dropdown-item(href='http://nas:3000/', target='_blank') 代码仓库