我有用于創建水平選項卡欄的html和css，其中我有一些類和一個javascript函數，該函數根據特定選項卡的選擇基本上更改選項卡：function openPage(evt, cityName) {  var i, tabcontent, tablinks;  tabcontent = document.getElementsByClassName("tabcontent");  for (i = 0; i < tabcontent.length; i++) {    tabcontent[i].style.display = "none";  }  tablinks = document.getElementsByClassName("tablinks");  for (i = 0; i < tablinks.length; i++) {    tablinks[i].className = tablinks[i].className.replace(" active", "");  }  document.getElementById(cityName).style.display = "block";  evt.currentTarget.className += " active";}// Get the element with id="defaultOpen" and click on itdocument.getElementById("defaultOpen").click();body {  font-family: Arial;}/* Style the tab */.tab {  overflow: hidden;  border: 1px solid #ccc;  background-color: #f1f1f1;}/* Style the buttons inside the tab */.tab button {  background-color: inherit;  float: left;  border: none;  outline: none;  cursor: pointer;  padding: 14px 16px;  transition: 0.3s;  font-size: 17px;}/* Change background color of buttons on hover */.tab button:hover {  background-color: #ddd;}/* Create an active/current tablink class */.tab button.active {  background-color: #FFFFFF;  border-bottom-color: #FFFFFF;}/* Style the tab content */.tabcontent {  display: none;  padding: 6px 12px;  border: 1px solid #ccc;  border-top: none;}/* Style the close button */.topright {  float: right;  cursor: pointer;  font-size: 28px;}.topright:hover {  color: red;}當我運行它時，它工作正常，但是要刪除的所選選項卡下方有一個下劃線。有沒有人有這個想法，如何在所選選項卡下刪除它？