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<!DOCTYPE html> <html> <body> <h2>JavaScript 能做什么？</h2> <p>JavaScript 可以显示隐藏的 HTML 元素。</p> <p id="demo" style="display:none">Hello JavaScript!</p> <button type="button" onclick="document.getElementById('demo').style.display='block'">单击我！</button> </body> </html>