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<!DOCTYPE html> <html> <body> <p>单击该按钮以检查该按钮元素是否支持 Core XML DOM Level 2 功能。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong>Chrome、Firefox、Opera 和 IE8 及更早版本不支持此方法。</p> <p id="demo"></p> <script> function myFunction() { var item = document.getElementsByTagName("BUTTON")[0]; var x = item.isSupported("Core", "2.0"); document.getElementById("demo").innerHTML = x; } </script> </body> </html>