XML格式数据解析

<?xml version="1.0" encoding="utf-8" ?>
<users>
  <user>
    <name>刘备</name>
    <sex>男</sex>
    <age>160</age>
    <desc>桃园三结义</desc>
  </user>
  <user>
    <name>隔壁小王</name>
    <sex>猛男</sex>
    <age>18</age>
    <desc>年轻气力盛</desc>
  </user>
</users>

<?php
header(‘content-type:text/xml;charset=utf-8‘);       //content-type:text/xml;

$res = file_get_contents("01-data.xml"); echo $res; 

?>

var bt = document.getElementById(‘bt‘)
        bt.onclick = function () {
            var xhr =new XMLHttpRequest()
            xhr.open("get", "aa.php")
            xhr.send()
    xhr.onreadystatechange=function(){
        if(xhr.readyState===4){
            if(xhr.status===200){
                console.log(xhr.responseXML)      //xhr.responseXML

} } } }