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<!DOCTYPE html> <html> <body> <ul id="myList"> <li>咖啡</li> <li>茶</li> <li>水</li> <li>汽水</li> </ul> <button type="button" onclick="myFunction()">更改列表项标记类型</button> <script> function myFunction() { document.getElementById("myList").style.listStyleType = "upper-roman"; } </script> </body> </html>