w3school在线测试工具 v1.2

（请在下面的文本框中编辑您的代码，然后单击此按钮测试结果。）

编辑您的代码：

<html>
<head>
<script type="text/javascript">
var xmlhttp;
function loadXMLDoc(url)
{
xmlhttp=null;
if (window.XMLHttpRequest)
  {// all modern browsers
  xmlhttp=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {// for IE5, IE6
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
if (xmlhttp!=null)
  {
  xmlhttp.onreadystatechange=state_Change;
  xmlhttp.open("GET",url,true);
  xmlhttp.send(null);
  }
else
  {
  alert("Your browser does not support XMLHTTP.");
  }
}

function state_Change()
{
if (xmlhttp.readyState==4)
  {// 4 = "loaded"
  if (xmlhttp.status==200)
    {// 200 = "OK"
    document.getElementById('p1').innerHTML="This file was last modified on: " + xmlhttp.getResponseHeader('Last-Modified');
    }
  else
    {
    alert("Problem retrieving data:" + xmlhttp.statusText);
    }
  }
}
</script>
</head>
<body>

<p id="p1">
The getResponseHeader() function returns a header from a resource.
Headers contain file information like length,
server-type, content-type, date-modified, etc.</p>

<button onclick="loadXMLDoc('http://api.chiefleo.com/w3school/example/ajax/t.asp?f=xdom_nav_nextsibling')">Get "Last-Modified"</button>

</body>
</html>

W3School TIY

编辑您的代码：

查看结果: