<div style="padding: 20px; text-align: center;"> <h1 style="color: #FF6B9D;">Hello World</h1> <p>这是一个预览示例</p> <button id="demoBtn">点击我</button> </div> body { font-family: sans-serif; } h1 { font-size: 32px; } button { background: linear-gradient(135deg, #FF6B9D, #4ECDC4); color: white; padding: 10px 20px; border: none; border-radius: 8px; cursor: pointer; } document.getElementById('demoBtn').addEventListener('click', function() { alert('Hello from JavaScript!'); }); ▶ 运行代码

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