<nav class="block-affix-nav hidden-print hidden-xs hidden-sm affix" id="block-nav-affix">
  <ul class="nav bs-docs-sidenav">
  {% for code,item in block.meta.items|default(null) %}       
    <li>
      <a href="#js-affix-{{ code }}" style="padding:5px;">
      {% if item.title|default(null) %}
        {{ item.title }}
      {% else %}
        {{ code }}
      {% endif %}
      </a>
    </li>
  {% endfor %}
    <li>
      <a class="back-to-top" href="#top" style="padding:5px;">
        返回顶部
      </a>
    </li>
  </ul>

  
</nav>
