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<!DOCTYPE html> <html> <head> <style> .mystyle { background-color: aqua; padding: 30px; } .mystyle2 { background-color: coral; padding: 50px; } </style> </head> <body> <p>多次单击该按钮可在 DIV 的两个类名之间切换。</p> <button onclick="myFunction()">试一试</button> <div id="myDIV" class="mystyle"> 我是一个 DIV 元素 </div> <script> function myFunction() { var x = document.getElementById("myDIV"); if (x.className === "mystyle") { x.className = "mystyle2"; } else { x.className = "mystyle"; } } </script> </body> </html>