Edit in JSFiddle

//create a default Model object
var myModel = new Backbone.Model();

//bind a callback to the built-in 'all' event
myModel.on('all', function (e) {
    console.log(e);
});

//triggers 'change' and 'change:attribute' event, which triggers 'all' twice
myModel.set({'test':'test'}); 

/*using listenTo() can accomplish the same thing
var A = _.extend({}, Backbone.Events);

A.listenTo(myModel, 'all', function (e) {
    console.log(e);
});
*/