响应式导航栏固定如何实现_Position sticky结合flex grid实践案例

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

<nav class="navbar">
  <div class="logo">Logo</div>
  <ul class="nav-links">
    <li><a href="#home">首页</a></li>
    <li><a href="#about">关于</a></li>
    <li><a href="#services">服务</a></li>
    <li><a href="#contact">联系</a></li>
  </ul>
  <div class="menu-toggle">&#9776;</div>
</nav>

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
}

.logo, .menu-toggle {
  flex: 1;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
  flex: 3;
  justify-content: center;
}

.nav-links a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: row;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 5%;
    right: 5%;
    background: white;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  }

  .nav-links.active {
    max-height: 200px;
    padding: 1rem 0;
  }

  .menu-toggle {
    cursor: pointer;
    font-size: 1.5rem;
  }
}

document.querySelector('.menu-toggle').addEventListener('click', function() {
  document.querySelector('.nav-links').classList.toggle('active');
});