How Backbone.js Implements Inheritance

example-1.js

// create a constructor which inherits from Backbone.Model
var ToDo = Backbone.Model.extend(
  // instance properties
  {
    toJSON: function() { ... }
  },
  // static properties
  {
    createFromJSON: function(jsonObj) { ... }
  }
);

// create instance and invoke instance method
var item = new ToDo();
item.toJSON();
// invoke static method
ToDo.createFromJSON(...);