AI 编程工具<html><head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <style type="text/css">#ex1{ border: thin dotted #FF0000;}</style><script>function displayResult(){ document.getElementById("ex1").style.borderBottom="thick solid #0000FF";}</script></head><body><div id="ex1">这是一些文本。</div><br><button type="button" onclick="displayResult()">修改底部边框</button></body></html>