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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 300px; height: 100px; background-color: coral; color: white; margin-bottom: 10px; } </style> </head> <body> <p>点击按钮，在下方显示div元素的class属性值。</p> <div id="myDIV" class="mystyle"> 我是一个 DIV 元素 with class="mystyle" </div> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByClassName("mystyle")[0].className; var y = document.getElementById("myDIV").className; document.getElementById("demo").innerHTML = "Using getElementsByClassName: " + x + "<br>" + "Using getElementById: " + y; } </script> </body> </html>