What's the convention to define backbone models class properties/fields

Question

I want to define which properties a class has. We use backbone for OOP. I've read that backbone model gets its properties when initialized, and only methods are defined for the class using extend. But I think that having explicitly defined class fields adds to readability. Is there some convention on how to do that?

Answer 1

From the fine manual:

extend Backbone.Model.extend(properties, [classProperties])
[...] as well as optional classProperties to be attached directly to the constructor function.

Similarly for collections, routers, and views.

To define a class method on a model:

var M = Backbone.Model.extend({
    // instances methods and properties go here...
}, {
    some_class_method: function() { ... }
});

M.some_class_method(); // Then this will work.