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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <body> <p>单击按钮获取文档命名空间的 URI。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong>Internet Explorer 8 及更早版本不支持 namespaceURI 属性。</p> <p id="demo"></p> <script> function myFunction() { var x = document.documentElement.namespaceURI; document.getElementById("demo").innerHTML = x; } </script> </body> </html>