在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<script src="loadxmldoc.js.html"> 
</script>
</head>
<body>

<script>
xmlDoc=loadXMLDoc("books_ns.xml");

x=xmlDoc.getElementsByTagName("title")[0];
ns="https://www.cainiaoplay.com/w3cnote/";

document.write(x.getAttributeNS(ns,"lang"));
</script>
</body>
</html>

源代码

动行结果