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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 300px; height: 100px; background-color: coral; text-align: center; font-size: 25px; color: white; margin-bottom: 10px; } </style> </head> <body> <p>单击按钮为 div 设置一个类。</p> <div id="myDIV"> 我是一个 DIV 元素 </div> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("myDIV").className = "mystyle"; } </script> </body> </html>