<script> window.sessionStorage.setItem(['ScribeTransport'],['WebData']); </script>

pathとunix timeを入れます。
<script>
var unix = Math.floor((new Date()).getTime()/1E3);
var data = '{"path":"'+location.pathname+'", "time":"'+unix+'"}';
window.sessionStorage.setItem(['ScribeTransport'],[data]);
</script>
ここまではOK

セットされたsessionを、JSON.parseで取り出す。
<script>
var a = window.sessionStorage.getItem(['ScribeTransport']);
b = JSON.parse(a);
document.write(b.path);
document.write(b.time);
var unix = Math.floor((new Date()).getTime()/1E3);
var data = '{"path":"'+location.pathname+'", "time":"'+unix+'"}';
window.sessionStorage.setItem(['ScribeTransport'],[data]);
</script>
来た!

sessionから滞在時間とリファラーを抽出する
var a = window.sessionStorage.getItem(['ScribeTransport']);
b = JSON.parse(a);
var unix = Math.floor((new Date()).getTime()/1E3);
document.write("リファラー" + b.path + "<br>");
document.write("滞在時間" +(unix - b.time)+ "秒");
var data = '{"path":"'+location.pathname+'", "time":"'+unix+'"}';
window.sessionStorage.setItem(['ScribeTransport'],[data]);
OKOKOK
