<!DOCTYPE html> <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>