W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <body> <ul><li>Coffee</li><li>Tea</li></ul> <p id="demo">请点击按钮来改变某个列表项的文本。</p> <button onclick="myFunction()">试一下</button> <script> function myFunction() { var list = document.getElementsByTagName("UL")[0] list.getElementsByTagName("LI")[0].innerHTML = "Milk"; } </script> </body> </html>
查看结果: