参考

修改themes/butterfly/layout/includes/loading/fullpage-loading.pug

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#loading-box(onclick='document.getElementById("loading-box").classList.add("loaded")')
  .loading-bg
    div.loading-img
    .loading-image-dot

script.
  const preloader = {
    endLoading: () => {
      document.body.style.overflow = 'auto';
      document.getElementById('loading-box').classList.add("loaded")
    },
    initLoading: () => {
      document.body.style.overflow = '';
      document.getElementById('loading-box').classList.remove("loaded")

    }
  }
  window.addEventListener('load',()=> { preloader.endLoading() })

  if (!{theme.pjax && theme.pjax.enable}) {
    document.addEventListener('pjax:send', () => { preloader.initLoading() })
    document.addEventListener('pjax:complete', () => { preloader.endLoading() })
  }

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

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if theme.preloader.source === 1
  include ./fullpage-loading.pug
else if theme.preloader.source === 2
  include ./pace.pug
else
  include ./fullpage-loading.pug
  include ./pace.pug

新建source/css/progress_bar.css, 也可以不做这一步下面配置文件pace_css_url这一项就要留空, 这一步是修改 pace 加载的胶囊 💊 样式用的

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.pace {
    -webkit-pointer-events: none;
    pointer-events: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    z-index: 2000;
    position: fixed;
    margin: auto;
    top: 10px;
    left: 0;
    right: 0;
    height: 8px;
    border-radius: 8px;
    width: 4rem;
    background: #eaecf2;
    border: 1px #e3e8f7;
    overflow: hidden;
  }
  
  .pace-inactive .pace-progress {
    opacity: 0;
    transition: 0.3s ease-in;
  }
  
  .pace .pace-progress {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    -o-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-transform: translate3d(0, 0, 0);
    -moz-transform: translate3d(0, 0, 0);
    -ms-transform: translate3d(0, 0, 0);
    -o-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    max-width: 200px;
    position: absolute;
    z-index: 2000;
    display: block;
    top: 0;
    right: 100%;
    height: 100%;
    width: 100%;
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    animation: gradient 1.5s ease infinite;
    background-size: 200%;
  }
  
  .pace.pace-inactive {
    opacity: 0;
    transition: 0.3s;
    top: -8px;
  }
  @keyframes gradient {
    0% {
      background-position: 0% 50%;
    }
    50% {
      background-position: 100% 50%;
    }
    100% {
      background-position: 0% 50%;
    }
  }

修改themes/butterfly/source/css/_layout/loading.styl, 其中颜色代码--anzhiyu-card-bg等可以自行替换为自己的色值。

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if hexo-config('preloader')
  .loading-bg
    display: flex;
    width: 100%;
    height: 100%;
    position: fixed;
    background: #ec9bad;
    z-index: 1001;
    opacity: 1;
    transition: .3s;

  #loading-box
    .loading-img
      width: 100px;
      height: 100px;
      border-radius: 50%;
      margin: auto;
      border: 4px solid #f0f0f2;
      animation-duration: .3s;
      animation-name: loadingAction;
      animation-iteration-count: infinite;
      animation-direction: alternate;
    .loading-image-dot
      width: 30px;
      height: 30px;
      background: #6bdf8f;
      position: absolute;
      border-radius: 50%;
      border: 6px solid #fff;
      top: 50%;
      left: 50%;
      transform: translate(18px, 24px);
    &.loaded
      .loading-bg
        opacity: 0;
        z-index: -1000;

  @keyframes loadingAction
    0% {
        opacity: 1;
    }

    100% {
        opacity: .4;
    }

自定义style.css，其中 background 的 url 即为 loading 的图片地址。

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.loading-img {
    background: url(IMG) no-repeat center center;
    background-size: cover;
  }

在_config.yml中添加引用CSS

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inject:
  head:
    - <link rel="stylesheet" href="/css/style.css">
  bottom:
    # - <script src="xxxx"></script>

最后修改_config.butterfly.yml中preloader选项, 改完以后source: 1为满屏加载无pace胶囊,source: 2为pace胶囊无满屏动画, source: 3是两者都启用。

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# Loading Animation (加载动画)
preloader:
  enable: true
  # source
  # 1. fullpage-loading
  # 2. pace (progress bar)
  # else all
  source: 3
  # pace theme (see https://codebyzach.github.io/pace/)
  pace_css_url: /css/progress_bar.css
  avatar:  # 自定义头像