css 制作目录

使用纯CSS制作目录

通过CSS的counter-reset和counter-increment属性可以自动生成目录编号，结合锚点实现跳转功能。

<div class="toc">
  <h3>目录</h3>
  <ul>
    <li><a href="#section1">章节一</a></li>
    <li><a href="#section2">章节二</a></li>
    <li><a href="#section3">章节三</a></li>
  </ul>
</div>

<style>
  .toc {
    counter-reset: section;
    border-left: 3px solid #3498db;
    padding-left: 15px;
  }
  .toc ul {
    list-style: none;
    padding: 0;
  }
  .toc li::before {
    counter-increment: section;
    content: counter(section) ". ";
    color: #e74c3c;
  }
  .toc a {
    text-decoration: none;
    color: #2c3e50;
    transition: color 0.3s;
  }
  .toc a:hover {
    color: #3498db;
  }
</style>

美化目录样式

添加悬停效果和过渡动画增强用户体验。

.toc {
  background-color: #f8f9fa;
  border-radius: 5px;
  padding: 20px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.toc li {
  padding: 8px 0;
  border-bottom: 1px dashed #ddd;
}

.toc li:last-child {
  border-bottom: none;
}

.toc a:hover {
  padding-left: 5px;
}

响应式目录设计

使用媒体查询适应不同屏幕尺寸。

@media (max-width: 768px) {
  .toc {
    position: fixed;
    top: 0;
    left: -250px;
    width: 250px;
    height: 100vh;
    transition: left 0.3s;
    z-index: 1000;
  }

  body.toc-active .toc {
    left: 0;
  }
}

嵌套多级目录

通过CSS计数器实现多级嵌套编号。

<ul class="toc-multi">
  <li>一级标题
    <ul>
      <li>二级标题</li>
      <li>二级标题</li>
    </ul>
  </li>
</ul>

<style>
  .toc-multi {
    counter-reset: level1;
  }
  .toc-multi > li::before {
    counter-increment: level1;
    content: counter(level1) ". ";
  }
  .toc-multi ul {
    counter-reset: level2;
    padding-left: 20px;
  }
  .toc-multi ul li::before {
    counter-increment: level2;
    content: counter(level1) "." counter(level2) " ";
  }
</style>

浮动目录实现

创建始终可见的浮动目录。

.toc-float {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  max-height: 80vh;
  overflow-y: auto;
  background: white;
  padding: 15px;
  border: 1px solid #eee;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.toc-float::-webkit-scrollbar {
  width: 5px;
}

.toc-float::-webkit-scrollbar-thumb {
  background: #ccc;
}

动态高亮当前章节

使用JavaScript配合CSS实现阅读进度指示。

window.addEventListener('scroll', function() {
  const sections = document.querySelectorAll('section');
  const links = document.querySelectorAll('.toc a');

  sections.forEach((sec, index) => {
    const rect = sec.getBoundingClientRect();
    if(rect.top <= 100 && rect.bottom >= 100) {
      links[index].classList.add('active');
    } else {
      links[index].classList.remove('active');
    }
  });
});

.toc a.active {
  color: #e74c3c;
  font-weight: bold;
  border-left: 3px solid #e74c3c;
  padding-left: 10px;
}