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<!DOCTYPE html> <html> <body> <p>一个无序列表:</p> <ul> <li>咖啡</li> <li>茶</li> <li>牛奶</li> </ul> <p>单击按钮可查看此文档中有多少个 li 元素。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("LI"); document.getElementById("demo").innerHTML = x.length; } </script> </body> </html>