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<!DOCTYPE html> <html> <body> <p id="demo" style="font-family:Arial,Helvetica,sans-serif;">这是一个段落，以 Arial 字体显示。</p> <button type="button" onclick="myFunction()">返回字体</button> <script> function myFunction() { alert(document.getElementById("demo").style.fontFamily); } </script> </body> </html>