splashStorage.js

;(function(){
    function makeStorage(){
        var keys = [];

        var storage = Object.create(Object, {
            getItem: {value: function(k) {
                if(this.hasOwnProperty(k)) {
                    return this[k];
                }
            }},
            setItem: {value: function(k, v) {
                this[k] = String(v);
                update();
            }},
            removeItem: {value: function(k) {
                if(this.hasOwnProperty(k)) {
                    delete this[k];
                }
                update();
            }},
            clear: {value: function(){
                for(var k in this){
                    if(this.hasOwnProperty(k)) {
                        delete this[k];
                    }
                }
                keys.splice(0, keys.length);
            }},
            key: {value: function(i) {
                return keys[i];
            }},
            length: {get: function(){
                return keys.length;
            }}
        });

        var update = function() {
            keys.splice(0, keys.length);
            for(var k in storage){
                if(storage.hasOwnProperty(k)){
                    keys.push(k);
                }
            }
        };

        return {
            storage: storage,
            update: update
        };
    }

    var local = makeStorage();
    var session = makeStorage();

    window.__defineGetter__('localStorage', function(){
        local.update();
        return local.storage;
    });

    window.__defineGetter__('sessionStorage', function(){
        session.update();
        return session.storage;
    });
})();