LocalStorage functions with cookie fallback on incognito mode

LocalStorage.js

var Utils = {
    isLocalStorageSupported : function(){
        var isSupported = false;
        var mod = 'localStorageSupportTest';
        
        try{
            localStorage.setItem(mod, mod);
            localStorage.removeItem(mod);
            
            isSupported = true;
        }catch(e){
            isSupported = false;
        }
        
        return isSupported;
    },
    setItem : function(key, value){
        if(this.isLocalStorageSupported()){
            window.localStorage.setItem(key, value);
        }else{
            this.createCookie(key, value);
        }
    },
    removeItem : function(key){
        if(this.isLocalStorageSupported()){
            window.localStorage.removeItem(key);
        }else{
            this.createCookie(key, '');
        }
    },
    getItem : function(key){
        if(this.isLocalStorageSupported()){
            return window.localStorage.getItem(key);
        }else{
            return this.readCookie(key);
        }
    },
    createCookie : 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=/";
    },
    readCookie : 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;
    }
};