如何使用 CSS 和 JavaScript 创建可折叠部分?

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要使用 CSS 和 JavaScript 创建可折叠部分，代码如下 −

示例

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .collapse {
      background-color: rgb(83, 186, 255);
      color: white;
      cursor: pointer;
      padding: 18px;
      width: 100%;
      border: none;
      text-align: left;
      outline: none;
      font-size: 18px;
   }
   .active, .collapse:hover {
      background-color: rgb(34, 85, 160);
   }
   .content {
      padding: 0 18px;
      display: none;
      overflow: hidden;
      background-color: #b6fdff;
      font-size: 18px;
   }
</style>
</head>
<body>
<h1>Collapsible Example</h1>
<h2>Click on the below collapsible to show the contents</h2>
<button type="button" class="collapse">Open Collapsible</button>
<div class="content">
<h3>
Lorem ipsum dolor, sit amet consectetur adipisicing elit. Optio, ducimus!
</h3>
</div>
<script>
   var collapse = document.querySelector(".collapse");
   var i;
   collapse.addEventListener("click", function() {
      this.classList.toggle("active");
      var content = this.nextElementSibling;
      if (content.style.display === "block") {
         content.style.display = "none";
      } else {
         content.style.display = "block";
      }
   });
</script>
</body>
</html>