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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 300px; height: 50px; background-color: coral; color: white; font-size: 25px; } </style> </head> <body> <p>单击按钮将"mystyle"类添加到 DIV。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong> Internet Explorer 9 及更早版本不支持 classList 属性。</p> <div id="myDIV"> 我是一个 DIV 元素 </div> <script> function myFunction() { document.getElementById("myDIV").classList.add("mystyle"); } </script> </body> </html>