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{
  "firstName": "Miyazaki"
  "lastName": "Miya"
}

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<!--返回顶部按钮 -->
<a href="#" id="back-to-top" title="返回顶部"></a>

<!--返回顶部CSS -->
<style>
  #back-to-top {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 55px;
    width: 55px;
    height: 55px;
    border-radius: 7px;
    background-color: rgba(64, 158, 255, 0.5);
    box-shadow: var(--shadow-l2);
    font-size: 30px;
    text-align: center;
    line-height: 50px;
    cursor: pointer;
  }

  #back-to-top:before {
    content: ' ';
    display: inline-block;
    position: relative;
    top: 0;
    transform: rotate(135deg);
    height: 10px;
    width: 10px;
    border-width: 0 0 2px 2px;
    border-color: var(--back-to-top-color);
    border-style: solid;
  }

  #back-to-top:hover:before {
    border-color: #2674e0;
  }

  /* 在屏幕宽度小于 768 像素时，钮位置调整 */
  @media screen and (max-width: 768px) {
    #back-to-top {
      bottom: 20px;
      right: 20px;
      width: 40px;
      height: 40px;
      font-size: 10px;
    }
  }

  /* 在屏幕宽度大于等于 1024 像素时，按钮位置调整 */
  @media screen and (min-width: 1024px) {
    #back-to-top {
      bottom: 20px;
      right: 40px;
    }
  }

  /* 在屏幕宽度大于等于 1280 像素时，按钮位置调整 */
  @media screen and (min-width: 1280px) {
    #back-to-top {
      bottom: 20px;
      right: 55px;
    }
  }

  /* 目录显示时，隐藏按钮 */
  @media screen and (min-width: 1536px) {
    #back-to-top {
      visibility: hidden;
    }
  }
</style>

<!--返回顶部JS -->
<script>
  function backToTop() {
    document.documentElement.scrollIntoView({
      behavior: 'smooth',
    })
  }

  window.onload = function () {
    let scrollTop =
      this.document.documentElement.scrollTop || this.document.body.scrollTop
    let totopBtn = this.document.getElementById('back-to-top')
    if (scrollTop > 0) {
      totopBtn.style.display = 'inline'
    } else {
      totopBtn.style.display = 'none'
    }
  }

  window.onscroll = function () {
    let scrollTop =
      this.document.documentElement.scrollTop || this.document.body.scrollTop
    let totopBtn = this.document.getElementById('back-to-top')
    if (scrollTop < 200) {
      totopBtn.style.display = 'none'
    } else {
      totopBtn.style.display = 'inline'
      totopBtn.addEventListener('click', backToTop, false)
    }
  }
</script>

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这是一个链接[My Homepage](hugoblog-gamma.vercel.app)

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![](https://cdn.jsdelivr.net/gh/yurikko/pics/img/69dc4ecda6d9587cbc4535490abc8fad.png)

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< imgloop "florian-klauer-nptLmg6jqDo-unsplash.jpg,helena-hertz-wWZzXlDpMog-unsplash.jpg" >
//使用时外侧加双引号