如何自动切换页签

// HTML代码
<div id="tab1">Tab 1</div>
<div id="tab2">Tab 2</div>
<div id="tab3">Tab 3</div>

// JavaScript代码
function switchTab(tabId) {
  // 隐藏所有页签
  document.getElementById('tab1').style.display = 'none';
  document.getElementById('tab2').style.display = 'none';
  document.getElementById('tab3').style.display = 'none';
  
  // 显示指定页签
  document.getElementById(tabId).style.display = 'block';
}

// 自动切换页签
setInterval(function() {
  // 获取当前显示的页签
  var currentTab = document.querySelector('[style*="display: block"]');
  
  // 获取下一个页签的ID
  var nextTabId = currentTab.id === 'tab1' ? 'tab2' : (currentTab.id === 'tab2' ? 'tab3' : 'tab1');
  
  // 切换到下一个页签
  switchTab(nextTabId);
}, 5000); // 每隔5秒切换一次页签

<style>
.tab {
  display: none;
  animation: switchTab 5s infinite;
}

@keyframes switchTab {
  0% {
    display: none;
  }
  
  33.3% {
    display: block;
  }
  
  66.6% {
    display: none;
  }
}

.tab:nth-child(1) {
  animation-delay: 0s;
}

.tab:nth-child(2) {
  animation-delay: 5s;
}

.tab:nth-child(3) {
  animation-delay: 10s;
}
</style>

<div class="tab">Tab 1</div>
<div class="tab">Tab 2</div>
<div class="tab">Tab 3</div>