javascript代码不显示xml文件中的数据

var xhr = new XMLHttpRequest();
xhr.open("GET", "xmlfile.xml", true);
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    var xmlData = xhr.responseXML;
    // 在这里处理XML数据
  }
};
xhr.send();

var xmlData = xhr.responseXML;
var elements = xmlData.getElementsByTagName("element");

var xmlData = xhr.responseXML;
var elements = xmlData.getElementsByTagName("element");

for (var i = 0; i < elements.length; i++) {
  var element = elements[i];
  var data = element.textContent; // 获取节点的文本内容

  var div = document.createElement("div");
  div.textContent = data;
  document.body.appendChild(div);
}

var xmlData = xhr.responseXML;
var xpathResult = xmlData.evaluate("//element[@attribute='value']", xmlData, null, XPathResult.ANY_TYPE, null);
var node = xpathResult.iterateNext();

while (node) {
  // 处理匹配的节点
  node = xpathResult.iterateNext();
}