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<!DOCTYPE html> <html> <head> <style> p#demo { text-decoration: underline; } </style> </head> <body> <p id="demo"> Hello world! </p> <p>单击“试一试”按钮更改段落的文本装饰行。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("demo").style.textDecorationLine = "line-through"; } </script> </body> </html>