Console script to count and list out globals on your page

gistfile1.txt

/*jslint browser:true, eqeq:true, forin:true, sloppy: true*/
(function (window, document) {
    var differences = {},
        exceptions = ['addEventListener', 'document', 'location', 'navigator', 'window'],
        globals = [],
        ignoreList = (window.prompt('Ignore filter (comma sep)?', '$,jQuery,ko') || '').split(','),
        iframe = document.createElement('iframe'),
        i;

    for (i in window) {
        if (exceptions.indexOf(i) < 0 && ignoreList.indexOf(i) < 0 && (String(window[i]) != '[object Window]')) {
            differences[i] = {
                'type': typeof window[i],
                'val': window[i]
            };
        }
    }

    iframe.style.display = 'none';
    document.body.appendChild(iframe);
    iframe.src = 'about:blank';
    iframe = iframe.contentWindow || iframe.contentDocument;

    for (i in differences) {
        if (iframe[i] === undefined) {
            globals.push(i);
        }
    }

    window.console.log('You have these %s globals', globals.length, globals);

}(window, window.document));