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<!DOCTYPE html> <html> <body> <p id="demo">点击按钮查看这个P元素中的第一个属性是否为ID属性</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("demo"); x.innerHTML = x.attributes[0].isId; } </script> <p><strong>注意：</strong>任何主流浏览器都不支持 isId 属性。</p> </body> </html>