汉堡按钮创建

HTML结构

<button class="hamburger">
  <div class="bar"></div>
  <div class="bar"></div>
  <div class="bar"></div>
</button>

CSS样式

.hamburger {
  cursor: pointer;
  background-color: transparent;
  border: none;
  padding: 10px;
}

.hamburger .bar {
  width: 30px;
  height: 3px;
  background-color: #333;
  margin: 6px 0;
  transition: 0.4s;
}

/* 鼠标悬停时的样式 */
.hamburger:hover .bar {
  background-color: #555;
}

/* 菜单展开时的样式 */
.hamburger.active .bar:nth-child(1) {
  transform: translateY(8px) rotate(-45deg);
}

.hamburger.active .bar:nth-child(2) {
  opacity: 0;
}

.hamburger.active .bar:nth-child(3) {
  transform: translateY(-8px) rotate(45deg);
}

JavaScript 控制展开和收起

const hamburger = document.querySelector('.hamburger');
const navMenu = document.querySelector('.nav-menu');

hamburger.addEventListener('click', function() {
  this.classList.toggle('active');
  navMenu.classList.toggle('active');
});