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<!DOCTYPE html> <html> <body> <ol id="myList"> <li>茶</li> <li>牛奶</li> <li>水</li> </ol> <p>单击按钮创建 LI 元素。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.createElement("LI"); var t = document.createTextNode("咖啡"); x.appendChild(t); document.getElementById("myList").appendChild(x); } </script> </body> </html>