如何發送一個XMLHttpRequest的檢索HTML標題資料
該getAllResponseHeaders （ ）函數返回的標題資源。標題包含的檔案資訊，如長度，伺服器類型，內容類型，日期修改等
<html>
<head>
<script type="text/javascript">
var xmlhttp;
function loadXMLDoc(url)
{
xmlhttp=null;
if (window.XMLHttpRequest)
{// code for Firefox, Mozilla, IE7, etc.
xmlhttp=new XMLHttpRequest();
}
else if (window.ActiveXObject)
{// code for IE6, IE5
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=xmlhttp.getAllResponseHeaders();
}
else
{
alert("Problem retrieving data:" + xmlhttp.statusText);
}
}
}
</script>
</head>
<body>
<p id="p1">
該getAllResponseHeaders （ ）函數返回的標題資源。
標題包含的檔案資訊，如長度，
伺服器的類型，內容類型，日期修改等.</p>
<button onclick="loadXMLDoc('test_xmlhttp.txt')">Get Headers</button>
</body>
</html>
得到結果如下.
Content-Length: 93 Content-Type: text/plain Last-Modified: Tue, 29 Jan 2008 14:22:39 GMT Accept-Ranges: bytes ETag: "40cef2668262c81:4cd" Server: Microsoft-IIS/6.0 MicrosoftOfficeWebServer: 5.0_Pub X-Powered-By: ASP.NET Date: Fri, 28 Nov 2008 07:43:37 GMT
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