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<!DOCTYPE html> <html> <body> <p>单击该按钮可查看指定的命名空间是否为默认命名空间。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong>Internet Explorer 8 及更早版本不支持 isDefaultNamespace 方法。</p> <p id="demo"></p> <script> function myFunction() { var d = document.documentElement; var x = d.isDefaultNamespace("http://www.w3.org/1999/xhtml"); document.getElementById("demo").innerHTML = x; } </script> </body> </html>