AJAX 动态获取当前时间(php)
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2022-06-24 16:17:45
客户端代码： 复制代码 代码如下:
客户端代码：
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>动态显示时间</title>
</head>
<script language="javascript">
var xmlhttp;
function createxmlhttprequest(){
if(window.activexobject){
xmlhttp = new activexobject("microsoft.xmlhttp");
}
else if(window.xmlhttprequest){
xmlhttp = new xmlhttprequest();
}
else{
alert("创建请求失败");
}
}
function sendrequest(){
createxmlhttprequest();
url = "time_check.php";
xmlhttp.onreadystatechange = callback;
xmlhttp.open('get',url,true);
xmlhttp.send(null);
}
function callback(){
if(xmlhttp.readystate ==4){
if(xmlhttp.status == 200){
document.getelementbyid("time").innerhtml = xmlhttp.responsetext;
settimeout("sendrequest()",1000);
}
}
}
</script>
<body>
<input type="button" value="check it" onclick="sendrequest();" />
<br/>
<span id="time"></span>
</body>
</html>
服务器端代码：
<?php
header("cache-control:no-cache,must-revalidate"); //取消php页面缓存的设置
header('content-type: text/html;charset=gb2312');
$showtime = date("北京时间y年m月d日h:i:s");
echo $showtime;
?>
复制代码 代码如下:
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>动态显示时间</title>
</head>
<script language="javascript">
var xmlhttp;
function createxmlhttprequest(){
if(window.activexobject){
xmlhttp = new activexobject("microsoft.xmlhttp");
}
else if(window.xmlhttprequest){
xmlhttp = new xmlhttprequest();
}
else{
alert("创建请求失败");
}
}
function sendrequest(){
createxmlhttprequest();
url = "time_check.php";
xmlhttp.onreadystatechange = callback;
xmlhttp.open('get',url,true);
xmlhttp.send(null);
}
function callback(){
if(xmlhttp.readystate ==4){
if(xmlhttp.status == 200){
document.getelementbyid("time").innerhtml = xmlhttp.responsetext;
settimeout("sendrequest()",1000);
}
}
}
</script>
<body>
<input type="button" value="check it" onclick="sendrequest();" />
<br/>
<span id="time"></span>
</body>
</html>
服务器端代码：
复制代码 代码如下:
<?php
header("cache-control:no-cache,must-revalidate"); //取消php页面缓存的设置
header('content-type: text/html;charset=gb2312');
$showtime = date("北京时间y年m月d日h:i:s");
echo $showtime;
?>
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