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<!DOCTYPE html> <html> <body> <h3>如何访问 LI 元素的演示</h3> <ol> <li id="myLi">咖啡</li> <li>茶</li> <li>牛奶</li> <li>水</li> </ol> <p>单击该按钮可将列表项设置为从数字“300”而不是“1”开始递增。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myLi"); x.value = "300"; } </script> </body> </html>