Use localStorage in Incognito mode using UnderScore, jQuery Cookie.

LocalStorageInIncognitoMode.coffee

hasStorage = ->
  try
    mod = new Date
    localStorage.setItem mod, mod.toString()
    result = localStorage.getItem(mod) == mod.toString()
    localStorage.removeItem mod
    return result

if !hasStorage()

  window.CustomStorage =
    length: 0

    setItem: (item, val)->
      @[item] = val
      $.cookie(item, val);
      @length+= 1

    getItem: (item)->
      @[item]

    removeItem: (item)->
      delete @[item]
      $.removeCookie(item);
      @length-= 1

  window.CustomStorage = _.extend(window.CustomStorage, $.cookie());
  window.CustomStorage.length = Object.keys(window.CustomStorage).length - 4
  window.CustomSessionStorage = {}

else
  window.CustomStorage = localStorage;
  window.CustomSessionStorage = sessionStorage;