gistfile1.js

var PersonCollection = Spine.Model.setup("Person", [ 
  "firstName", 
  "lastName" 
]);

PersonCollection.include({
    fullName: function() {
        return this.firstName + " " + this.lastName;
    }
});

var PersonController = Spine.Controller.create({
    bindings: {
        "value input[name=firstName]": "firstName",
        "value input[name=lastName]": "lastName",
        "text #fullName": "fullName"
    },

    init: function() {
        this.initializeBindings(this.model);
    }
});

PersonController.include(DataBind);

var Person = PersonCollection.create({ firstName: "", lastName: "" });
var Controller = PersonController.init({ el: 'body', model: Person });