session.js 介绍
Session.js - Get user session information
示例代码：
<script type='text/javascript'>
window.session = {
options: { gapi_location: true },
start: function(session){ // can also use window.session global.
if (session.first_session.visits > 1){
alert('Hi again from ' + session.location.address.city);
} else {
if (session.current_session.referrer_info.host.contains('facebook')){
alert('Hi there from '+ session.location.address.city +'. How about liking us on facebook?');
} else if (session.current_session.search.engine){
alert('Did you find what you were looking for from ' + session.current_session.search.engine + '?');
}
}
}
}
</script>
<script type='text/javascript' src="http://codejoust.github.com/session.js/session-0.4.js"></script>