Function fireEvent

lib/visibility.fallback.js:21–33

()

    var event = null
    var i = 0
    var fireEvent = function () {
        if( document.createEvent ) {
            if ( !event ) {
                event = document.createEvent('HTMLEvents');
                event.initEvent('visibilitychange', true, true);
            }
            document.dispatchEvent(event);
        } else {
            if ( typeof(Visibility) == 'object' ) {
                Visibility._change.call(Visibility, { });
            }
        }
    }

    var onFocus = function () {
        document.hidden = false;