如何在单击时更改选项卡颜色？

<div class="tab">
  <button class="tab-button" onclick="changeTabColor(1)">选项卡1</button>
  <button class="tab-button" onclick="changeTabColor(2)">选项卡2</button>
  <button class="tab-button" onclick="changeTabColor(3)">选项卡3</button>
</div>

.tab-button {
  background-color: #ccc; /* 默认颜色 */
}

.tab-button.active {
  background-color: #ff0000; /* 激活后的颜色 */
}

function changeTabColor(tabIndex) {
  // 移除所有选项卡的active类
  var tabButtons = document.getElementsByClassName('tab-button');
  for (var i = 0; i < tabButtons.length; i++) {
    tabButtons[i].classList.remove('active');
  }

  // 为当前选项卡添加active类
  var currentTabButton = tabButtons[tabIndex - 1];
  currentTabButton.classList.add('active');
}