JavaScript で引き戸効果を実装するにはどうすればよいですか?

<div class="container">
  <ul class="nav">
    <li><a href="#section1">Section 1</a></li>
    <li><a href="#section2">Section 2</a></li>
    <li><a href="#section3">Section 3</a></li>
  </ul>
  <div class="content">
    <div id="section1" class="section">Content 1</div>
    <div id="section2" class="section">Content 2</div>
    <div id="section3" class="section">Content 3</div>
  </div>
</div>

.container {
  width: 600px;
  margin: 0 auto;
}

.nav {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
}

.nav li {
  flex: 1;
  text-align: center;
  cursor: pointer;
  background-color: #eee;
  padding: 10px;
}

.content {
  background-color: #ddd;
  padding: 20px;
  height: 200px;
}

.section {
  display: none;
}

document.addEventListener('DOMContentLoaded', function() {
  // 获取导航栏列表和内容区域列表
  var navItems = document.querySelectorAll('.nav li');
  var sections = document.querySelectorAll('.section');

  // 初始化第一个选项为默认选中状态
  navItems[0].classList.add('active');
  sections[0].style.display = 'block';

  // 给导航栏列表项添加事件监听器
  navItems.forEach(function(item, index) {
    item.addEventListener('click', function() {
      // 清除所有选项的选中状态
      navItems.forEach(function(navItem) {
        navItem.classList.remove('active');
      });
      // 显示点击的选项对应的内容区域
      sections.forEach(function(section) {
        section.style.display = 'none';
      });
      sections[index].style.display = 'block';
      // 给点击的选项添加选中状态
      item.classList.add('active');
    });
  });
});

<script src="script.js"></script>