Hexo博客 | 如何让Butterfly主题导航栏居中

if !theme.disable_top_img && page.top_img !== false
  if is_post()
    - var top_img = page.top_img || page.cover || page.randomcover
  else if is_page()
    - var top_img = page.top_img || theme.default_top_img
  else if is_tag()
    - var top_img = theme.tag_per_img && theme.tag_per_img[page.tag] 
    - top_img = top_img ? top_img : (theme.tag_img !== false ? theme.tag_img || theme.default_top_img : false)
  else if is_category()
    - var top_img = theme.category_per_img && theme.category_per_img[page.category]
    - top_img = top_img ? top_img : (theme.category_img !== false ? theme.category_img || theme.default_top_img : false)
  else if is_home()
    - var top_img = theme.index_img !== false ? theme.index_img || theme.default_top_img : false
  else if is_archive()
    - var top_img = theme.archive_img !== false ? theme.archive_img || theme.default_top_img : false
  else
    - var top_img = page.top_img || theme.default_top_img

  if top_img !== false
    - var imgSource = top_img && top_img.indexOf('/') !== -1 ? `background-image: url('${url_for(top_img)}')` : `background: ${top_img}`
    - var bg_img = top_img ? imgSource : ''
    - var site_title = is_archive() ? fragment_cache('findArchivesTitle', function(){return findArchivesTitle(theme.menu);}) : page.title || page.tag || page.category || config.title
    - var isHomeClass = is_home() ? 'full_page' : 'not-home-page'
    - is_post() ? isHomeClass = 'post-bg' : isHomeClass
  else
    - var isHomeClass = 'not-top-img'
else
  - var top_img = false
  - var isHomeClass = 'not-top-img'

header#page-header(class=isHomeClass style=bg_img)
  !=partial('includes/header/nav', {}, {cache: true})
  if top_img !== false
    if is_post()
      #coverdiv.coverdiv
        img#post-cover.cover.entered.loading(alt='cover' src=`${top_img}`)
      include ./post-info.pug
    else if is_home() 
      #site-info
        h1#site-title=site_title
        if theme.subtitle.enable
          - var loadSubJs = true
          #site-subtitle
            span#subtitle
        if(theme.social)
          #site_social_icons
            !=fragment_cache('social', function(){return partial('includes/header/social')})
      #scroll-down
        i.fas.fa-angle-down.scroll-down-effects
    else
      #coverdiv.coverdiv
        img#post-cover.cover.entered.loading(alt='cover' src=`${top_img}`)
      #page-site-info
        h1#site-title=site_title

nav#nav
  #nav-group
    #blog_name
      a#site-name(href=url_for('/')) #[=config.author]

    #menus
      !=partial('includes/header/menu_item', {}, {cache: true})

    #nav-right
      if (theme.algolia_search.enable || theme.local_search.enable)
        #search-button
          a.nav-rightbutton.site-page.social-icon.search
            i.fas.fa-search.fa-fw
      #darkmode_navswitch
        a.nav-rightbutton.site-page.darkmode_switchbutton(onclick="switchDarkMode()")
          i.fas.fa-adjust
      #toggle-menu
        a.nav-rightbutton.site-page
          i.fas.fa-bars.fa-fw

function switchDarkMode() { // Switch Between Light And Dark Mode
      const nowMode = document.documentElement.getAttribute('data-theme') === 'dark' ? 'dark' : 'light'
      if (nowMode === 'light') {
        activateDarkMode()
        saveToLocal.set('theme', 'dark', 2)
        GLOBAL_CONFIG.Snackbar !== undefined && btf.snackbarShow(GLOBAL_CONFIG.Snackbar.day_to_night)
      } else {
        activateLightMode()
        saveToLocal.set('theme', 'light', 2)
        GLOBAL_CONFIG.Snackbar !== undefined && btf.snackbarShow(GLOBAL_CONFIG.Snackbar.night_to_day)
      }
      // handle some cases
      typeof utterancesTheme === 'function' && utterancesTheme()
      typeof FB === 'object' && window.loadFBComment()
      window.DISQUS && document.getElementById('disqus_thread').children.length && setTimeout(() => window.disqusReset(), 200)
    }