Google analytics localStorage

gistfile1.js

var analyticsId = '';

if (window.localStorage &&  window.localStorage.setItem) {
  window.ga('create', analyticsId, {
    'storage': 'none',
    'clientId': window.localStorage.getItem('clientId')
  });

  window.ga(function(tracker) {
    return window.localStorage.setItem('clientId', tracker.get('clientId'));
  });
} else {
  window.ga('create', analyticsId);
}