参考了安知鱼的方案进行修改
原教程butterfly导航栏修改方案(自用方案)

回到顶部按钮使用的方法引用右键菜单中定义的方法，没有定义的请查看相应位置的注释进行修改

自定义CSS

添加自定义cssnav_menu.css

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/* 请根据需要修改 */

/* 顶部调节 */
#nav {
    transition: 0.3s;
    background: rgba(254, 254, 254, .7);
    backdrop-filter: saturate(180%) blur(20px);
    transition: none !important;
    -webkit-transition: none !important;
    -moz-transition: none !important;
    -ms-transition: none !important;
    -o-transition: none !important;
}
#nav a {
    border-radius: 8px;
    color: #4c4948;
}
#nav a:hover {
    background: #5CA1FF;
    transition: 0.3s;
}
#sidebar #sidebar-menus .menus_items .site-page:hover {
    color: white;
    border-radius: 0 0 5px #5CA1FF;
}
#nav .menus_items .menus_item .menus_item_child li:hover a {
    color: white !important;
}
#nav .menus_items .menus_item .menus_item_child li {
    font-weight: 700;
    margin: 5px;
    border-radius: 5px !important;
    transition: all 0.3s;
}
div#menus {
    display: flex;
    align-items: center;
}
#page-header #nav .nav-button a {
    height: 35px;
    width: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
}
#nav .site-page {
    padding-bottom: 0px;
}
#nav *::after {
    background-color: transparent !important;
}

/* 百分比显示 */
#nav-totop {
    width: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.3s;
}
#nav-totop:hover .totopbtn i {
    opacity: 1;
}
#nav-totop #percent {
    font-size: 10px;
    background: white;
    color: #5CA1FF;
    width: 25px;
    height: 25px;
    border-radius: 35px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.3s;
    font-weight: 700;
}
.nav-fixed #nav-totop #percent,
.page #nav-totop #percent {
    background: #4c4948;
    color: white;
    font-size: 13px;
}
#page-header:not(.is-top-bar) #percent {
    transition: 0.3s;
}
#page-header:not(.is-top-bar) #nav-totop {
    width: 0;
    opacity: 0;
    transition: width 0.3s, opacity 0.2s;
    margin-left: 0 !important;
}
#nav-totop:hover #percent {
    opacity: 0;
    transform: scale(1.5);
    font-weight: 700;
}

#page-header #nav #nav-right div {
    margin-left: 0.5rem;
    padding: 0;
}

/* 按钮调节 */
#nav #search-button {
    font-size: 1.5em;
}
#nav #darkmode_navswitch {
    font-size: 1.3em;
}
.nav-button {
    cursor: pointer;
}
#nav-totop .totopbtn i {
    position: absolute;
    display: flex;
    opacity: 0;
}

/* 网站名称返回按钮 */
#site-name,
.shuoshuo {
    white-space: nowrap;
    overflow: hidden;
}
#site-name {
    padding: 5px 8px;
    position: relative;
}
#site-name *:not(i):hover {
    display: none !important;
}
#blog_name #site-name:hover::after {
    opacity: 1;
    transform: scale(1.01);
}
#blog_name #site-name::after {
    opacity: 0;
    background-color: #5CA1FF !important;
    border-radius: 8px;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    -ms-border-radius: 8px;
    -o-border-radius: 8px;
    transition: 0.3s;
    -webkit-transition: 0.3s;
    -moz-transition: 0.3s;
    -ms-transition: 0.3s;
    -o-transition: 0.3s;
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    content: '\f015';
    box-shadow: 0 0 5px #5CA1FF;
    font-family: 'Font Awesome 6 Free';
    text-align: center;
    color: white;
}
#site-name i {
    position: absolute;
    top: 50%;
    left: 50% !important;
    transform: translate(-50%, -50%);
    left: 0;
    opacity: 0;
}
#site-name:hover i {
    opacity: 1;
}

/* 子菜单横向 */
#nav .menus_items .menus_item .menus_item_child li {
    display: inline-block;
}
#nav .menus_items .menus_item:hover .menus_item_child {
    box-sizing: content-box;
    display: block;
    transform: translateX(-50%);
    right: auto;
    left: auto !important;
}

/* 子菜单空隙 */
#nav .menus_items .menus_item .menus_item_child {
    top: 65px;
}

/* 圆角隐藏 */
ul.menus_item_child {
    overflow: hidden;
    border-radius: 5px;
}

/* 一级菜单居中 */
#nav .menus_items {
    position: absolute;
    width: fit-content;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}
#menus>div.menus_items>div>a {
    letter-spacing: 0.3rem;
    font-weight: 700;
    height: 40px;
    line-height: 40px;
    padding: 0em 0.3em 0em 0.5em;
}
#nav .menus_items .menus_item {
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    margin: auto;
    align-items: center;
}
#nav .menus_items .menus_item>a>i:last-child {
    display: none;
}

.page #nav a:hover {
    color: white !important;
    background: #5CA1FF;
    transition: 0.3s;
    box-shadow: 0px 0px 5px #5CA1FF;
}
#page-header #nav a:hover,
#page-header.nav-fixed #nav a:hover,
#page-header.nav-fixed #nav #site-name:hover,
#page-header.nav-fixed #nav #toggle-menu:hover {
    color: white;
}

/* 显示标题回到顶部 */
#page-name::before {
    font-size: 18px;
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 8px;
    color: white !important;
    top: 6px;
    left: 0;
    content: '回到顶部';
    background-color: #5CA1FF;
    transition: all 0.3s;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    opacity: 0;
    box-shadow: 0 0 3px #5CA1FF;
}
#page-name:hover:before {
    opacity: 1;
}
#page-name {
    position: relative;
    padding: 10px 30px;
}

/* 容器布局 */
#name-container {
    transition: all 0.3s;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    bottom: 60px;
}
#name-container:hover {
    transform: translateX(-50%) scale(1.03);
}
center#name-container {
    position: absolute;
    width: 100%;
    left: 50%;
    transform: translateX(-50%);
    font-weight: 700;
}

/* 固定样式 */
.nav-fixed #nav {
    transform: translateY(58px) !important;
    -webkit-transform: translateY(58px) !important;
    -moz-transform: translateY(58px) !important;
    -ms-transform: translateY(58px) !important;
    -o-transform: translateY(58px) !important;
}
.nav-fixed.nav-visible #name-container {
    top: 60px;
    transition: 0.3s;
}
.nav-fixed #name-container {
    top: 15%;
    transition: 0.3s;
}
.nav-fixed.nav-visible #menus .menus_items {
    bottom: -10px;
    transition: 0.3s;
}
.nav-fixed #menus .menus_items {
    bottom: 60px;
    transition: 0.3s;
}

.mask-name-container {
    width: 1200px;
    height: 100%;
    position: absolute;
    overflow: hidden;
    left: 50%;
    transform: translateX(-50%);
}

@media screen and (max-width: 768px) {
    .mask-name-container {
        width: 600px;
    }
}
@media screen and (max-width: 500px) {
    .mask-name-container {
        display: none;
    }
}

自定义js

添加自定义cssnav_menu.js

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var OriginTitile = document.title;// 防止和动态标题冲突，保持显示原标题
// 返回顶部 显示网页阅读进度
window.onscroll = percent;// 执行函数
// 页面百分比
function percent() {
    let a = document.documentElement.scrollTop, // 卷去高度
        b = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight, document.body.offsetHeight, document.documentElement.offsetHeight, document.body.clientHeight, document.documentElement.clientHeight) - document.documentElement.clientHeight, // 整个网页高度 减去 可视高度
        result = Math.round(a / b * 100), // 计算百分比
        btn = document.querySelector("#percent"); // 获取图标

        result<=100||(result=100),btn.innerHTML=result;

        document.getElementById("page-name").innerText = OriginTitile.split(" | 梦念逍遥")[0] //按照安知鱼的说法，这个放在函数外面也行
}

main.js

为了处理顶栏一闪而过的bug修改本地themes/butterfly/source/js/main.js，注意有引用线上版本的话一定要使用本地版本改完再自行上传线上版本

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  window.scrollCollect = () => {
        return btf.throttle(function (e) {
          const currentTop = window.scrollY || document.documentElement.scrollTop
          const isDown = scrollDirection(currentTop)
          if (currentTop > 56) {
+           $header.classList.add('is-top-bar')
            if (isDown) {
              if ($header.classList.contains('nav-visible')) $header.classList.remove('nav-visible')
              if (isChatBtnShow && isChatShow === true) {
                chatBtnHide()
                isChatShow = false
              }
            } else {
              if (!$header.classList.contains('nav-visible')) $header.classList.add('nav-visible')
              if (isChatBtnHide && isChatShow === false) {
                chatBtnShow()
                isChatShow = true
              }
            }
            $header.classList.add('nav-fixed')
            if (window.getComputedStyle($rightside).getPropertyValue('opacity') === '0') {
              $rightside.style.cssText = 'opacity: 0.8; transform: translateX(-58px)'
            }
          } else {
            if (currentTop === 0) {
-             $header.classList.remove('nav-fixed', 'nav-visible')
+             $header.classList.remove('is-top-bar')
            }
            $rightside.style.cssText = "opacity: ''; transform: ''"
          }

          if (document.body.scrollHeight <= innerHeight) {
            $rightside.style.cssText = 'opacity: 0.8; transform: translateX(-58px)'
          }
        }, 200)()
      }

index.pug

修改themes/butterfly/layout/includes/header/index.pug

其中nav-visible控制默认显示的是导航栏菜单，替换成is-top-bar就是默认显示站点标题

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  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 = page.title || page.tag || page.category || config.title
-   - var isHomeClass = is_home() ? 'full_page' : 'not-home-page'
+   - var isHomeClass = is_home() ? 'full_page nav-fixed nav-visible' : 'not-home-page'
    - is_post() ? isHomeClass = 'post-bg' : isHomeClass
  else
    - var isHomeClass = 'not-top-img'

nav.pug

替换themes/butterfly/layout/includes/header/nav.pug

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- const { darkmode } = theme
nav#nav
  span#blog_name
    a#site-name(href=url_for('/')) #[=config.title]

  div.mask-name-container
    center(id="name-container")
        //- 这里换成自己站点的全称
        //- href="javascript:rmf.scrollToTop()"修改为onclick="btf.scrollToDest(0,500)"
      a(id="page-name" href="javascript:rmf.scrollToTop()") 梦念逍遥 - 无梦之境
    
  #menus
    if (theme.algolia_search.enable || theme.local_search.enable)
      div.nav-button#search-button
        a.site-page.social-icon.search
          i.fas.fa-search.fa-fw
    
    if darkmode.enable && darkmode.button
      div.nav-button#darkmode_navswitch
        a.darkmode_switchbutton(type="button" title=_p('rightside.night_mode_title') onclick="rmf.switchDarkMode()")
          i.fas.fa-adjust

    div.nav-button#nav-totop
      a.totopbtn
        i.fas.fa-arrow-up
        span#percent(onclick="btf.scrollToDest(0,500)") 0
    

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

    #toggle-menu
      a.site-page
        i.fas.fa-bars.fa-fw