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<!DOCTYPE html> <html> <body> <h1 id="myH1">如何更改标题的样式</h1> <p>单击该按钮可更改 H1 元素的样式。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("myH1").style.color = "red"; } </script> </body> </html>