如何使用 JavaScript 在元素中添加和删除类名之间切换?

javascriptweb developmentobject oriented programming更新于 2025/12/3 10:20:17

要使用 JavaScript 在元素中添加和删除类名之间切换，代码如下 −

示例

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
   .newStyle {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      width: 100%;
      padding: 25px;
      background-color: rgb(147, 80, 255);
      color: white;
      font-size: 25px;
      box-sizing: border-box;
      text-align: center;
   }
</style>
</head>
<body>
<h1>Adding className with JavaScript Example</h1>
<button class="btn">点击此处</button>
<h2>Click the above button to add className to below div</h2>
<div id="sampleDiv">
This is a DIV element.
</div>
<script>
   document.querySelector(".btn").addEventListener("click", addClassName);
   function addClassName() {
      var element = document.getElementById("sampleDiv");
      element.classList.toggle("newStyle");
}
</script>
</body>
</html>