gistfile1.js

// A key to use for localStorage
var lsKey = "my very unique key"

  // Some data to store in it, this could just as easily be from a web service
  , dataStore = {
      0: {
          'name': 'Steven Patrick Morrissey',
          'role': 'singer'
      },
      1: {
          'name': 'Johnny Marr',
          'role': 'guitarist'
      }
  }

  // A JSON string serialization of the data
  , serialized = JSON.stringify(dataStore);

// Persist it with localStorage
localStorage.setItem(lsKey, serialized);

// On a subsequent page load, restore the data
try {
    dataStore = JSON.parse(localStorage.getItem(lsKey));
} catch(e) {
    dataStore = {}
}