编辑blog/themes/butterfly/layout/includes/footer.pug文件

将以下内容

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©${theme.footer.owner.since} - ${nowYear} By ${config.author}

改为

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&copy;${theme.footer.owner.since} - ${nowYear + ' '} <i id="heartbeat" class="fa fas fa-heartbeat"></i> ${config.author}

将以下内容

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&copy;${nowYear} By ${config.author}

改为

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&copy;${nowYear + ' '} <i id="heartbeat" class="fa fas fa-heartbeat"></i> ${config.author}

将以下内容添加到<head></head>标签内，也可以直接放在footer.pug文件的最后一行：

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<link rel="stylesheet" href="https://fastly.jsdelivr.net/gh/HCLonely/images@master/others/heartbeat.min.css">

footer.pug文件完整代码如下所示：

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#footer-wrap
  if theme.footer.owner.enable
    - var now = new Date()
    - var nowYear = now.getFullYear()
    if theme.footer.owner.since && theme.footer.owner.since != nowYear
      .copyright!= `&copy;${theme.footer.owner.since} - ${nowYear} <i id="heartbeat" class="fa fas fa-heartbeat"></i> By ${config.author}`
    else
      .copyright!= `&copy;${nowYear} <i id="heartbeat" class="fa fas fa-heartbeat"></i> By ${config.author}`
  if theme.footer.copyright
    .framework-info
      span= _p('footer.framework') + ' '
      a(href='https://hexo.io')= 'Hexo'
      span.footer-separator |
      span= _p('footer.theme') + ' '
      a(href='https://github.com/jerryc127/hexo-theme-butterfly')= 'Butterfly'
  if theme.footer.custom_text
    .footer_custom_text!=`${theme.footer.custom_text}`

<link rel="stylesheet" href="https://fastly.jsdelivr.net/gh/HCLonely/images@master/others/heartbeat.min.css">