JSONP request function

jsonp.js

/*jslint browser: true*/
/*global define, exports, module*/

/**
    A module that makes jsonp requests.
    @module jsonp
    @author Matt Barker
*/
(function (factory) {
    'use strict';

    if (typeof define === 'function' && define.amd) {
        // AMD
        define([], factory);
    } else if (typeof exports === 'object') {
        // CommonJS
        module.exports = factory();
    } else {
        // Browser global
        window.jsonp = factory();
    }
}(function () {
    'use strict';

    var id = 0;

    /**
        This callback type is used to handle JSONP responses.
        @callback requestCallback
        @param {Object} data - JSON response
    */

    /**
        Make a JSONP request. 
        @param {string} url - Address to send the request to
        @param {requestCallback} callback - Function to pass the returned JSON data to
        @param {Object} [context] - Context for the callback function
        @example
        var url = 'http://en.wikipedia.org/w/api.php?format=json&action=query&list=geosearch&gsradius=1000&gscoord=52.42350%7C-1.71347&callback=';
        
        function callback(data) {
            console.log(data);
        }
        
        jsonp(url, callback);
    */
    function jsonp(url, callback, context) {
        id += 1;

        var wrapper = 'JSONP_request' + id,
            script = document.body.appendChild(document.createElement('script'));

        script.src = url + wrapper;

        window[wrapper] = function () {
            window[wrapper] = callback.apply(context || window, arguments);
            document.body.removeChild(script);
        };
    }

    return jsonp;
}));