Define JavaScript Frameworks

Backbone.js

(function(){

    // Initial Setup
    // -------------

    // Save a reference to the global object (`window` in the browser, `exports`
    // on the server).
    var root = this;

    // Save the previous value of the `Backbone` variable, so that it can be
    // restored later on, if `noConflict` is used.
    var previousBackbone = root.Backbone;

    // The top-level namespace. All public Backbone classes and modules will
    // be attached to this. Exported for both CommonJS and the browser.
    var Backbone;
    if (typeof exports !== 'undefined') {
        Backbone = exports;
    } else {
        Backbone = root.Backbone = {};
    }

    // Current version of the library. Keep in sync with `package.json`.
    Backbone.VERSION = '0.9.2';

}).call(this);

jQuery.js

(function(window, undefined) {

        // Map over jQuery in case of overwrite
    var _jQuery = window.jQuery,

        // Map over the $ in case of overwrite
        _$ = window.$,

        // Define a local copy of jQuery
        jQuery = function( selector, context ) {
            // The jQuery object is actually just the init constructor 'enhanced'
            return new jQuery.fn.init( selector, context, rootjQuery );
        };

    jQuery.fn = jQuery.prototype = {
        constructor: jQuery,

        init: function() {

        }
    };

    // Expose jQuery to the global object
    window.jQuery = window.$ = jQuery;

    // Expose jQuery as an AMD module, but only for AMD loaders that
    // understand the issues with loading multiple versions of jQuery
    // in a page that all might call define(). The loader will indicate
    // they have special allowances for multiple jQuery versions by
    // specifying define.amd.jQuery = true. Register as a named module,
    // since jQuery can be concatenated with other files that may use define,
    // but not use a proper concatenation script that understands anonymous
    // AMD modules. A named AMD is safest and most robust way to register.
    // Lowercase jquery is used because AMD module names are derived from
    // file names, and jQuery is normally delivered in a lowercase file name.
    // Do this after creating the global so that if an AMD module wants to call
    // noConflict to hide this version of jQuery, it will work.
    if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
        define( "jquery", [], function () { return jQuery; } );
    }

})(window);