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<!DOCTYPE html> <html> <body> <h3>如何访问 SUP 元素的演示</h3> <p>单击按钮将<sup id="mySup">此上标文本</sup> 的颜色设置为红色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("mySup"); x.style.color = "red"; } </script> </body> </html>