首頁面會是這樣的：
$_SESSION['visitcount']=0;
?>
function runcounter()
{
if (window.XMLHttpRequest)
{
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("counterelement").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("POST","counter.php",true);
//may need these:
var params="id=testdata";
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.setRequestHeader("Content-length", params.length);
xmlhttp.setRequestHeader("Connection", "close");
//need rest
xmlhttp.send();
setTimeout("runcounter()",1000); //refresh function every second
}
這将每秒更新一次函數(計數器)，并在頁面加載時運作一次。
PHP：
session_start();
$_SESSION['visitcount']++;
echo $_SESSION['visitcount'];