php Ajax 局部刷新

php Ajax 局部刷新:

HTML部分

</head>    
<body>    
<h1>Ajax动态显示时间</h1>    
<input type="button" value="开始显示时间" id="go" onclick="start()" />    
<p>当前时间：<font color="red"><span id="showtime"></span></font></p>    
</body>    
  
<script type="text/javascript">  
var xmlHttp;  
function createXMLHttpRequest(){  
 if(window.ActiveXObject){  
  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");  
 }  
 else if(window.XMLHttpRequest){  
  xmlHttp = new XMLHttpRequest();  
 }  
}  
function start(){  
 createXMLHttpRequest();  
 var url="getTime.php";  
 xmlHttp.open("GET",url,true);  
 xmlHttp.onreadystatechange = callback;  
 xmlHttp.send(null);  
}  
function callback(){  
 if(xmlHttp.readyState == 4){  
  if(xmlHttp.status == 200){  
   document.getElementById("showtime").innerHTML = xmlHttp.responseText;  
   setTimeout("start()",1000);  
  }  
 }  
}  
</script>  
</html>

PHP部分

<?php  
header("cache-control:no-cache,must-revalidate");    
header("Content-Type:text/html;charset=utf-8");  
$time = "2012-1-20 18:00:00";  
$dt_element=explode(" ",$time);  
$date_element=explode("-",$dt_element[0]);  
$time_element=explode(":",$dt_element[1]);  
$date = mktime($time_element[0],$time_element[1],$time_element[2],$date_element[1],$date_element[2],$date_element[0]);  
$nowTime = time();    
$showtime = date("北京时间Y年m月d日H:i:s",$date-$nowTime);    
if($showtime<="北京时间1970年01月01日08:00:00"){  
    echo "happy new year";  
}  
echo $showtime;

　　

posted @ 2015-06-03 14:58  derrck  阅读(1422)  评论(0)  编辑  收藏  举报