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<!DOCTYPE html> <html> <body> <h1>使用 JavaScript 更改文本装饰</h1> <p>点击“试一试”按钮为 H1 元素加下划线：</p> <button onclick="myFunction()">试一试</button> <h1 id="myH1">这是我的标题</h1> <script> function myFunction() { document.getElementById("myH1").style.textDecoration = "underline"; } </script> </body> </html>