//前台的请求页面 <scripttype="text/javascript"> <!-- varxmlHttp; functioncreateXMLHttpRequest(){ if(window.ActiveXObject){ xmlHttp=newActiveXObject("Microsoft.XMLHTTP"); } elseif(window.XMLHttpRequest){ xmlHttp=newXMLHttpRequest(); } } functionstart(){ createXMLHttpRequest(); varurl="getTime.PHP"; xmlHttp.open("GET",url,true); xmlHttp.onreadystatechange=callback; xmlHttp.send(null); } functioncallback(){ if(xmlHttp.readyState==4){ if(xmlHttp.status==200){ document.getElementById("showtime").innerHTML=xmlHttp.responseText; setTimeout("start()",1000); } } } </script> <html> <head> <Metahttp-equiv="content-type"content="text/html;charset=utf-8"/> </head> <body> <h1>Ajax动态显示时间</h1> <inputtype="button"value="开始显示时间"id="go"onclick="start()"/> <p>当前时间：<fontcolor="red"><spanid="showtime"></span></font></p> </body> </html>
<?PHP
header("cache-control:no-cache,must-revalidate");
header("Content-Type:text/html;charset=utf-8");
date_default_timezone_set('PRC');
$showTime = date('Y-m-d H:i:s');
echo $showTime;
?>
