js 动态tab

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

  <div id="tab1" class="tab-content">
    <h2>Tab 1 Content</h2>
    <p>This is the content for Tab 1.</p>
  </div>

  <div id="tab2" class="tab-content" style="display:none;">
    <h2>Tab 2 Content</h2>
    <p>This is the content for Tab 2.</p>
  </div>

  <div id="tab3" class="tab-content" style="display:none;">
    <h2>Tab 3 Content</h2>
    <p>This is the content for Tab 3.</p>
  </div>
</div>

.tabs {
  width: 100%;
}

.tab-button {
  background-color: #f1f1f1;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
}

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

.tab-content {
  padding: 20px;
  border: 1px solid #ccc;
}

function openTab(evt, tabName) {
  var i, tabcontent, tablinks;
  tabcontent = document.getElementsByClassName("tab-content");
  for (i = 0; i < tabcontent.length; i++) {
    tabcontent[i].style.display = "none";
  }
  tablinks = document.getElementsByClassName("tab-button");
  for (i = 0; i < tablinks.length; i++) {
    tablinks[i].className = tablinks[i].className.replace(" active", "");
  }
  document.getElementById(tabName).style.display = "block";
  evt.currentTarget.className += " active";
}