AI 编程工具xxxxxxxxxx<html><head><meta charset="utf-8"><title>菜鸟教程(runoob.com)</title></head><body><button onclick="myFunction()">点我</button><p id="demo">单击按钮检查功能核心XML DOM 2对按钮元素是否支持。</p><script>function myFunction(){ var item=document.getElementsByTagName("BUTTON")[0]; var x=document.getElementById("demo"); x.innerHTML=item.isSupported("Core","2.0");}</script><p><strong>注意:</strong> Internet Explorer 8 及之前版本不支持isSupported 方法。</p></body></html>