JS解析xml

function loadXML(xmlUrl) {
  try { //IE
    xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
  } catch (e) {
    try { //Firefox, Mozilla, Opera, etc.
      xmlDoc = document.implementation.createDocument("", "", null);
    } catch (e) {
      alert(e.message)
    }
  }
  try {
    xmlDoc.async = false;
    xmlDoc.load(xmlUrl);
  } catch (e) {
    try { //Chrome
      let xmlhttp = new window.XMLHttpRequest();
      xmlhttp.open("GET", xmlUrl, false);
      xmlhttp.send(null);
      xmlDoc = xmlhttp.responseXML;
      console.log(xmlDoc.documentElement);
    } catch (e) {
      alert(e.message)
    }
  }
  return xmlDoc.documentElement;
}