W3School TIY Editor
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<!DOCTYPE html> <html> <style> .myStyle { background-color: coral; padding: 16px; } .newStyle { background-color: lightblue; text-align: center; font-size: 25px; padding: 16px; } </style> <body> <h1>Element 对象</h1> <h2>className 属性</h2> <button onclick="myFunction()">切换</button> <p>多次点击 "切换" 可切换两个类。</p> <div id="myDIV" class="myStyle"> <p>我是 myDIV。</p> </div> <script> function myFunction() { const element = document.getElementById("myDIV"); if (element.className == "myStyle") { element.className = "newStyle"; } else { element.className = "myStyle"; } } </script> </body> </html>