Vuuv: Same answer.
Unless you provide a locally hosted database with the binaries for your game. (Think XAMP or EasyPHP here)
It's probably not a good idea for your users.
Otherwise, for data structures use array, dictionary or XML and webstorage to save them if dynamically modified, otherwise you can provide project files to fill/feed them datas if those aren't expected/supposed to change.
You can also check out in the third-part plugins, one like Yann's JSON which can provide an easier way to navigate datas.