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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 500px; height: 50px; border: 1px solid black; } .anotherClass { background-color: lightblue; padding: 25px; } .thirdClass { text-align: center; font-size: 25px; color: navy; margin-bottom: 10px; } </style> </head> <body> <p>单击按钮以查看 DIV 元素是否具有类“mystyle”。</p> <div id="myDIV" class="mystyle anotherClass thirdClass"> 我是一个 DIV 元素 </div> <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> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myDIV").classList.contains("mystyle"); document.getElementById("demo").innerHTML = x; } </script> </body> </html>