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<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { myFunction(this); } }; xhttp.open("GET", "books_ns.xml", true); xhttp.send(); function myFunction(xml) { var xmlDoc = xml.responseXML; var x = xmlDoc.getElementsByTagName("book")[0]; var ns = "https://w3schools.org.cn/edition/"; x.setAttributeNS(ns, "edition", "first"); document.getElementById("demo").innerHTML = x.getAttributeNS(ns,"edition"); } </script> </body> </html>
