readingResponseHeaders.html

xiejiaohui · 发表于 2013-2-7 19:06:14

例子来源：《Ajax 基础教程》金灵等译这本书非常不错

readingResponseHeaders.html

<html><head><title>Reading Response Header</title><script type="text/javascript">var xmlHttp;var requestType = "";function createXMLHttpRequest() {if (window.ActiveXObject) {xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}else if (window.XMLHttpRequest) {xmlHttp = new XMLHttpRequest();}}function doHeadRequest(request, url) {requestType = request;createXMLHttpRequest();xmlHttp.onreadystatechange = handleStateChange;xmlHttp.open("HEAD", url, true);xmlHttp.send(null);}function handleStateChange() {if(xmlHttp.readyState == 4) {if(requestType == "allResponseHeaders") {getAllResponseHeaders();}else if(requestType == "lastModified") {getLastModified();}else if(requestType == "isResourceAvailable") {getIsResourceAvailable();}}}function getAllResponseHeaders() {alert(xmlHttp.getAllResponseHeaders());}function getLastModified() {alert("Last Modified: " + xmlHttp.getResponseHeader("Last-Modified"));}function getIsResourceAvailable() {if(xmlHttp.status == 200) {alert("Successful response");}else if(xmlHttp.status == 404) {alert("Resource is unavailable");}else {alert("Unexpected response status: " + xmlHttp.status);}}</script></head><body><h1>Reading Response Headers</h1><a href="javascript:doHeadRequest('allResponseHeaders', 'readingResponseHeaders.xml');">Read All Response Headers</a><br /><a href="javascript:doHeadRequest('lastModified', 'readingResponseHeaders.xml');">Get Last Modified Date</a><br /><a href="javascript:doHeadRequest('isResourceAvailable', 'readingResponseHeaders.xml');">Read Available Resource</a><br /><a href="javascipt:doHeadRequest('isResourceAvailable', 'not-available.xml');">Read Unavailable Resource</a></body></html>

readingResponseHeaders.xml

<?xml version='1.0' encoding='UTF-8' ?><readingResponseHeaders></readingResponseHeaders>

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