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<!DOCTYPE html> <html> <body> <h1>DOMTokenList 对象</h1> <h2>keys() 方法</h2> <p>列表中的键有：</p> <p id="demo" class="c1 c2 c3"></p> <script> let list = document.getElementById("demo").classList; let text = ""; for (let x of list.keys()) { text += x + "<br>"; } document.getElementById("demo").innerHTML = text; </script> </body> </html>