JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://underscorejs.org/underscore.js"></script>
<script src="http://documentcloud.github.com/backbone/backbone.js"></script>

JavaScript

var Obj = Backbone.Model.extend({
    defaults: {
        myAttribute1: false,
        myAttribute2: true
    }
});

var MyModel = Backbone.Model.extend({
    defaults: {
        obj1: new Obj()
    }
});

var model = new MyModel();
var x = model.get("obj1").get("myAttribute1");
console.log(x);

model.get("obj1").set({ myAttribute1: true });

console.log(model.get("obj1").get("myAttribute1"));