选择"选项卡"时执行操作

<div class="tab-container">
 <button class="tab-button" onclick="openTab(event, 'tab1')">选项卡1</button>
 <button class="tab-button" onclick="openTab(event, 'tab2')">选项卡2</button>
 <button class="tab-button" onclick="openTab(event, 'tab3')">选项卡3</button>
</div>

<div id="tab1" class="tab-content">
  <h3>选项卡1内容</h3>
  <p>这里是选项卡1的内容。</p>
</div>

<div id="tab2" class="tab-content">
  <h3>选项卡2内容</h3>
  <p>这里是选项卡2的内容。</p>
</div>

<div id="tab3" class="tab-content">
  <h3>选项卡3内容</h3>
  <p>这里是选项卡3的内容。</p>
</div>

function openTab(evt, tabName) {
  // 获取所有选项卡按钮
  var tabButtons = document.getElementsByClassName("tab-button");
  
  // 遍历选项卡按钮，并将其样式设置为默认状态
  for (var i = 0; i < tabButtons.length; i++) {
    tabButtons[i].className = tabButtons[i].className.replace(" active", "");
  }
  
  // 将当前选中的选项卡按钮样式设置为激活状态
  evt.currentTarget.className += " active";
  
  // 获取所有选项卡内容
  var tabContents = document.getElementsByClassName("tab-content");
  
  // 遍历选项卡内容，并将其样式设置为默认状态
  for (var i = 0; i < tabContents.length; i++) {
    tabContents[i].style.display = "none";
  }
  
  // 将当前选中的选项卡内容样式设置为显示状态
  document.getElementById(tabName).style.display = "block";
}

.tab-container {
  display: flex;
  justify-content: space-around;
  margin-bottom: 20px;
}

.tab-button {
  background-color: #ddd;
  border: none;
  color: black;
  cursor: pointer;
  font-size: 16px;
  padding: 10px;
  transition: 0.3s;
}

.tab-button:hover {
  background-color: #ccc;
}

.tab-button.active {
  background-color: #4CAF50;
  color: white;
}

.tab-content {
  display: none;
}

.tab-content.show {
  display: block;
}