显示元素添加样式

2024/03/24 JQuery 2938 
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Toggle Element Visibility and Modify Styles</title>
  <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
  <style>
    .left {
      width: 200px;
      height: 200px;
      background-color: #e0e0e0;
      text-align: center;
      line-height: 200px;
    }
    .highlight {
      border: 2px solid red;
    }
  </style>
</head>
<body>

<button id="show-or-hide">Show/Hide Element</button>

<div class="left">
  Content inside left div
</div>

<script>
  $(document).ready(function(){
    $('#show-or-hide').click(function () {
      $('.left').toggle( function() {
        if ($(this).is(":visible")) {
          # 添加样式
          $(this).addClass('highlight');
        } else {
          # 移除样式
          $(this).removeClass('highlight');
        }
      });
    });
  });
</script>

</body>
</html>