如何使用Javascript从xml格式中仅提取所需的数据，如下所示

// 示例XML数据
var xmlData = `
<employees>
  <employee>
    <name>John</name>
    <age>30</age>
    <department>IT</department>
  </employee>
  <employee>
    <name>Jane</name>
    <age>35</age>
    <department>HR</department>
  </employee>
</employees>`;

// 创建DOM解析器对象
var parser = new DOMParser();

// 将XML数据解析为DOM对象
var xmlDoc = parser.parseFromString(xmlData, "application/xml");

// 使用XPath表达式选择所有employee节点
var employees = xmlDoc.evaluate("/employees/employee", xmlDoc, null, XPathResult.ANY_TYPE, null);

// 遍历选中的节点并提取数据
var employeeNode = employees.iterateNext();
while (employeeNode) {
  var name = employeeNode.querySelector("name").textContent;
  var age = employeeNode.querySelector("age").textContent;
  var department = employeeNode.querySelector("department").textContent;

  // 处理提取的数据
  console.log("Name:", name);
  console.log("Age:", age);
  console.log("Department:", department);

  // 继续遍历下一个节点
  employeeNode = employees.iterateNext();
}