js如何改变xml文件格式

// 假设我们有一个简单的 XML 字符串
let xmlString = `
<library>
  <book id="1">
    <title>JavaScript: The Good Parts</title>
    <author>Douglas Crockford</author>
  </book>
  <book id="2">
    <title>Eloquent JavaScript</title>
    <author>Marijn Haverbeke</author>
  </book>
</library>
`;

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

// 修改 XML 内容
let books = xmlDoc.getElementsByTagName("book");
for (let i = 0; i < books.length; i++) {
  let title = books[i].getElementsByTagName("title")[0];
  title.textContent = "New Title: " + title.textContent;
}

// 使用 XMLSerializer 将修改后的 XML 对象转换回字符串
let serializer = new XMLSerializer();
let modifiedXmlString = serializer.serializeToString(xmlDoc);

console.log(modifiedXmlString);