use cookies to test page request and load times

request-load-timer.js

var app = app || {};

app.cookie = {
    create: function (name, value, days) {
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            var expires = "; expires=" + date.toGMTString();
        } else var expires = "";
        document.cookie = name + "=" + value + expires + "; path=/";
    },

    read: function (name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    },

    erase: function (name) {
        createCookie(name, "", -1);
    }
}

function checkPostTime() {
    var then = new Date(app.cookie.read('last_post_time'));
    var now = new Date();
    var timespan = (now - then) / 1000;
    if (timespan > 10) {
        console.log(timespan + ' seconds: aahhh!!')
    }
}

function logLastPost() {
    app.cookie.create('last_post_time', new Date());
}

window.onunload = logLastPost;

var temp_f;

if (window.onload) {
    temp_f = window.onload;
}

window.onload = function () {
    if (temp_f) {
        temp_f();
    }
    checkPostTime();
}