JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="zh-Hant">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>daisyUI 單一卡片主題切換</title>

  <!-- ✅ 直接使用 daisyUI CDN -->
  <link href="https://cdn.jsdelivr.net/npm/daisyui@4.12.10/dist/full.min.css" rel="stylesheet" type="text/css" />
  <script src="https://cdn.tailwindcss.com"></script>
</head>

<body class="min-h-screen flex flex-col items-center justify-center gap-6 p-6 bg-gray-100">
  <button id="changeTheme" class="btn btn-primary">
    🎨 隨機更換卡片風格
  </button>

  <!-- ✅ 在 card 外層加 data-theme 屬性 -->
  <div id="cardContainer" data-theme="cupcake" class="card w-96 bg-base-100 shadow-xl transition-all duration-300">
    <figure><img src="https://picsum.photos/400/200" alt="隨機圖片"></figure>
    <div class="card-body">
      <h2 class="card-title">daisyUI Card</h2>
      <p>只改變卡片風格，不影響整個頁面。</p>
      <div class="card-actions justify-end">
        <button class="btn btn-secondary">了解更多</button>
      </div>
    </div>
  </div>

  <script>
    const themes = [
      "light","dark","cupcake","bumblebee","emerald","corporate",
      "synthwave","retro","cyberpunk","valentine","halloween",
      "garden","forest","aqua","lofi","pastel","fantasy",
      "wireframe","black","luxury","dracula"
    ];

    document.getElementById('changeTheme').addEventListener('click', () => {
      const randomTheme = themes[Math.floor(Math.random() * themes.length)];
      // ✅ 只改變卡片的 data-theme，而不是整個 html
      document.getElementById('cardContainer').setAttribute('data-theme', randomTheme);
      console.log("切換卡片主題:", randomTheme);
    });
  </script>
</body>
</h