js xml获取节点属性

// 假设我们有以下XML字符串
let xmlString = `
<bookstore>
  <book category="children">
    <title lang="en">Harry Potter</title>
    <author>J.K. Rowling</author>
    <year>2005</year>
    <price>29.99</price>
  </book>
</bookstore>
`;

// 解析XML字符串
let parser = new DOMParser();
let xmlDoc = parser.parseFromString(xmlString, "text/xml");

// 获取第一个book节点
let bookNode = xmlDoc.getElementsByTagName("book")[0];

// 获取category属性
let category = bookNode.getAttribute("category");
console.log(category); // 输出: children

// 假设我们有以下带有命名空间的XML字符串
let xmlStringWithNS = `
<ns:bookstore xmlns:ns="http://example.com/bookstore">
  <ns:book ns:category="children">
    <ns:title lang="en">Harry Potter</ns:title>
    <ns:author>J.K. Rowling</ns:author>
    <ns:year>2005</ns:year>
    <ns:price>29.99</ns:price>
  </ns:book>
</ns:bookstore>
`;

// 解析XML字符串
let parserWithNS = new DOMParser();
let xmlDocWithNS = parserWithNS.parseFromString(xmlStringWithNS, "text/xml");

// 获取第一个book节点
let bookNodeWithNS = xmlDocWithNS.getElementsByTagName("ns:book")[0];

// 获取带有命名空间的category属性
let categoryWithNS = bookNodeWithNS.getAttributeNS("http://example.com/bookstore", "category");
console.log(categoryWithNS); // 输出: children

let attributeValue = bookNode.getAttribute("nonexistentAttribute");
if (attributeValue !== null) {
  console.log(attributeValue);
} else {
  console.log("Attribute does not exist.");
}

let attributeValueWithNS = bookNodeWithNS.getAttributeNS("http://example.com/bookstore", "category");