// Feel free to change the drivers order :)
localforage.setDriver([
  localforage.INDEXEDDB,
  localforage.WEBSQL,
  localforage.LOCALSTORAGE
  ]).then(function() {
  var key = 'STORE_KEY';
  // var value = 'What we save offline';
  var value = 'asdf';
  value[0] = 65
  // var value = undefined;
  var UNKNOWN_KEY = 'unknown_key';

  localforage.setItem(key, value, function() {
    console.log('Using:' + localforage.driver());
    console.log('Saved: ' + value);

    localforage.getItem(key).then(function(readValue) {
      console.log('Read: ', readValue);
    });

    // Since this key hasn't been set yet, we'll get a null value
    localforage.getItem(UNKNOWN_KEY, function(err, readValue) {
      console.log('Result of reading ' + UNKNOWN_KEY, readValue);
    });
  });
});

// this is just for demonstration purposes
var originalConsoleLog = console.log;
function consoleLogProxy() {
  originalConsoleLog.apply(console, arguments);
  var htmlConsole = document.getElementById('htmlConsole');
  if (htmlConsole) {
    var message = Array.prototype.slice.apply(arguments, []).join(' ');
    htmlConsole.innerHTML += '<li>' + message + '</li>';
  }
}
console.log = consoleLogProxy;