JS(JavaScript)で取得できるクライアント情報、そこからアクセス解析の仕組みを考えてみる 
function functest()
{
  var strwork;
  var jsDate;

  jsDate = new Date();

  strwork = "JSDATE  :  " + jsDate.getFullYear() + "/" + jsDate.getMonth()+1 + "/" + jsDate.getDate() + " " + jsDate.getHours() + ":" + jsDate.getMinutes() + ":" + jsDate.getSeconds() + "\n";
  strwork = strwork + "HOST     :  " + location.host + "\n";
  strwork = strwork + "HOSTNAME :  " + location.hostname + "\n";
  strwork = strwork + "PORT     :  " + location.port + "\n";
  strwork = strwork + "PROTOCOL :  " + location.protocol + "\n";
  strwork = strwork + "HASH     :  " + location.hash + "\n";
  strwork = strwork + "SEARCH   :  " + location.search + "\n";
  strwork = strwork + "REQUEST  :  " + location.pathname + "\n";
  strwork = strwork + "CODE     :  " + navigator.appCodeName + "\n";
  strwork = strwork + "BROWSER  :  " + navigator.appName + "\n";
  strwork = strwork + "VERSION  :  " + navigator.appVersion + "\n";
  strwork = strwork + "LANG     :  " + navigator.language + "\n";
  strwork = strwork + "PLATFORM :  " + navigator.platform + "\n";
  strwork = strwork + "USERAGENT:  " + navigator.userAgent + "\n";
  strwork = strwork + "REFERER  :  " + document.referrer + "\n";
  strwork = strwork + "DOMAIN   :  " + document.domain + "\n";
  strwork = strwork + "SCREEN.W :  " + screen.width + "\n";
  strwork = strwork + "SCREEN.H :  " + screen.height + "\n";
  if (screen.colorDepth==8) {
    strwork = strwork + "SCREEN.COL:  " + screen.colorDepth + "Bit\n";
  } else {
    strwork = strwork + "SCREEN.COL:  " + screen.colorDepth + "Bit\n";
  }
  
  alert(strwork);

}