效果预览

步骤

修改主题的配置文件 _config.butterfly.yml，将index_img和footer_bg的参数改为transparent，background设置为自己的图片地址

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# Image (圖片設置)
# --------------------------------------

# The banner image of home page
index_img: transparent

# Beautify/Effect (美化/效果)
# --------------------------------------

# Website Background (設置網站背景)
# can set it to color or image (可設置圖片 或者 顔色)
# The formal of image: url(http://xxxxxx.com/xxx.jpg)
background: url(https://example.com/img/background.jpg)

# Footer Background
footer_bg: transparent

新建一个文件，位于 source/css/modify.styl，写入下列代码

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@import 'nib'

// 顶部图
#page-header
  &, &:before
    background: transparent !important
  &.post-bg, &.not-home-page
    height: 280px !important
  #post-info
    bottom: 40px !important
  #page-site-info
    top: 140px !important

  @media screen and (max-width: 768px)
    &.not-home-page
      height: 200px !important
    #post-info
      bottom: 10px !important
    #page-site-info
      top: 100px !important

.top-img
  height: 250px
  margin: -50px -40px 50px
  border-top-left-radius: inherit
  border-top-right-radius: inherit
  background-position: center center
  background-size: cover
  transition: all 0.3s

  @media screen and (max-width: 768px)
    height: 230px
    margin: -36px -14px 36px

  [data-theme='dark'] &
    filter: brightness(0.8)

// 页脚
#footer:before
  background-color: alpha(#FFF, .5)

  [data-theme='dark'] &
    background-color: alpha(#000, .5)

#footer-wrap, #footer-wrap a
  color: #111
  transition: unset

  [data-theme='dark'] &
    color: var(--light-grey)

在主题配置文件 _config.butterfly.yml 的 inject.head 引入样式

注：modify.styl 会被 Hexo 渲染成 modify.css 文件，所以此处应为 modify.css

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# other (其他)
# --------------------------------------

# Inject
# Insert the code to head (before '</head>' tag) and the bottom (before '</body>' tag)
# 插入代码到头部 </head> 之前 和 底部 </body> 之前
inject:
  head:
    - <link rel="stylesheet" href="/css/modify.css">

在博客根目录打开cmd，安装依赖

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npm install cheerio

新建一个文件，位于 scripts/modify.js，并写入下列代码

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'use strict';
const cheerio = require('cheerio');

/**
 * 在页面插入新顶部图
 * @param {cheerio.Root} $ Root
 */
function insertTopImg($) {
    let header = $('#page-header');
    if (header.length === 0) return;
    let background = header.css('background-image');
    if (!background) return;
    $('#post, #page, #archive, #tag, #category').prepend(`<div class="top-img" style="background-image: ${background};"></div>`);
}

hexo.extend.filter.register('after_render:html', function(str, data) {
    let $ = cheerio.load(str, {
        decodeEntities: false
    });
    insertTopImg($);
    return $.html();
});

hexo三连~