Backbone Jsonp Collection. only supports simple get commands.

backbone.jsonp-collection.js

Backbone.JsonpCollection = Backbone.Collection.extend({
    sync: function(method, model, options) {
        var params = _.extend({
            type: 'GET',
            url: this.url,
            dataType: "jsonp",
            processData: false
        }, options);

        return $.ajax(params);
    },

    parse: function(response) {
        if (this.type && response[this.type]) {
            return response[this.type];
        } else {
            return response;
        }
    }
});