<html><style>.myStyle { background-color: coral; padding: 16px;}</style><body><h1>DOMToken 对象</h1><h2>add() 方法</h2><button onclick="myFunction()">添加</button><p>请单击“添加”将“myStyle”类添加到 myDIV。</p><div id="myDIV"><p>我是 myDIV。</p></div><script>function myFunction() { const list = document.getElementById("myDIV").classList; list.add("myStyle");}</script></body></html>