php+ajax實現頁面自動刷新時間

　　indexphp

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<mce:script type="text/javascript"><!
var xmlHttp;
function createXMLHttpRequest(){
 if(windowActiveXObject){
 xmlHttp = new ActiveXObject("MicrosoftXMLHTTP");
 }
 else if(windowXMLHttpRequest){
 xmlHttp = new XMLHttpRequest();
 }
}
function start(){
 createXMLHttpRequest();
 var url="getTimephp";
 xmlHttpopen("GET"urltrue);
 xmlHttponreadystatechange = callback;
 xmlHttpsend(null);
}
function callback(){
 if(xmlHttpreadyState == ){
 if(xmlHttpstatus == ){
 documentgetElementById("showtime")innerHTML = xmlHttpresponseText;
 setTimeout("start()");
 }
 }
}
// ></mce:script>

<html>
<head>
<meta httpequiv="contenttype" content="text/html;charset=gb" />
</head>
<body>
<h>Ajax動態顯示時間</h>
<input type="button" value="開始顯示時間" id="go" onclick="start()" />
當前時間
</body>
</html>
<mce:script type="text/javascript"><!
var xmlHttp;
function createXMLHttpRequest(){
if(windowActiveXObject){
 xmlHttp = new ActiveXObject("MicrosoftXMLHTTP");
}
else if(windowXMLHttpRequest){
 xmlHttp = new XMLHttpRequest();
}
}
function start(){
createXMLHttpRequest();
var url="getTimephp";
xmlHttpopen("GET"urltrue);
xmlHttponreadystatechange = callback;
xmlHttpsend(null);
}
function callback(){
if(xmlHttpreadyState == ){
 if(xmlHttpstatus == ){
 documentgetElementById("showtime")innerHTML = xmlHttpresponseText;
 setTimeout("start()");
 }
}
}
// ></mce:script>

<html>
<head>
<meta httpequiv="contenttype" content="text/html;charset=gb" />
</head>
<body>
<h>Ajax動態顯示時間</h>
<input type="button" value="開始顯示時間" id="go" onclick="start()" />
當前時間
</body>
</html>

　　getTimephp

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<?php
header("cachecontrol:nocachemustrevalidate");
header("ContentType:text/html;charset=gb");
$showtime = date("北京時間Y年m月d日H:i:s");
echo $showtime;
?>

From:http://tw.wingwit.com/Article/program/PHP/201311/21254.html