backbone-example.js

var router = new Router();
Backbone.history.start();

// Load first view
window.location.hash = '#load/0';

// update model of the first view
views[0].model.set('name', 'John'); // => name is now: John

setTimeout(function() {
  // Load a second view
  window.location.hash = '#load/1';

  // This is the problem, updating the model of the first view still
  // triggers a “change” event although the view isn’t present in the DOM anymore
  views[0].model.set('name', 'Balthazar'); // => name is now: Balthazar
}, 2000);