/*by whatUwant*/
/*
document.write('referrer:'+document.referrer.host+'<br>');
document.write('host:'+document.location.host+'<br>');
document.write('pathname:'+document.location.pathname+'<br>');
*/

function CreateXMLHttpRequest()//这里是构造XMLHttpRequest对象的方法
{
    var xmlHttpRequest = null;//这里是大家都常用的IE，firefox中取得XMLHttpRequest对象的方法
    try 
    {
        xmlHttpRequest = new XMLHttpRequest(); 
    }
    catch(e)
    {
        try
        {
            xmlHttpRequest=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e)
        {
            xmlHttpRequest=new ActiveXObject("Microsoft.XMLHTTP");

        }
    }
    return xmlHttpRequest;
}

var http = CreateXMLHttpRequest();
var url = "/referrer.php";
var params = 'host='+document.location.host+'&pathname='+document.location.pathname+'&referrer='+document.referrer;
http.open("POST", url, true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
//http.setRequestHeader("Connection", "close");
http.send(params);