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<!DOCTYPE html> <html> <body> <h3>如何访问 OL 元素的演示</h3> <ol id="myOl"> <li>咖啡</li> <li>茶</li> <li>牛奶</li> </ol> <p>单击该按钮可将列表项设置为从数字“25”而不是“1”开始递增。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myOl"); x.start = "25"; } </script> </body> </html>