<html><body><ul id="myList"> <li>咖啡</li> <li>茶</li> <li>水</li> <li>汽水</li></ul><button type="button" onclick="myFunction()">更改列表项标记</button> <script>function myFunction() { document.getElementById("myList").style.listStyleImage = "url('sqorange.gif')";}</script></body></html>