如何更改XML属性

var xmlDoc = new DOMParser().parseFromString(xmlString, "application/xml");
var element = xmlDoc.getElementsByTagName("tagName")[0];
element.setAttribute("attributeName", "newAttributeValue");

import xml.etree.ElementTree as ET

xml_string = '<root><tag attributeName="oldAttributeValue">text</tag></root>'
root = ET.fromstring(xml_string)
tag = root.find('tag')
tag.set('attributeName', 'newAttributeValue')

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

String xmlString = "<root><tag attributeName=\"oldAttributeValue\">text</tag></root>";
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(new InputSource(new StringReader(xmlString)));
Element element = doc.getElementsByTagName("tag").item(0);
element.setAttribute("attributeName", "newAttributeValue");