Charge.js : simple script loader

charge.js

/**
 * @module Charge
 * @author M.Paraiso
 */
(function(ns){
"use strict";
var C = {};
    C.getXmlHttp = function(method,callback){
        var xmlHttp = new XMLHttpRequest();
        xmlHttp.onreadystatechange(function(event){
            if(event.status==200 && xmlHttp.readyState==4){
                callback(xmlHttp.responseText);
            }
        });
        return xmlHttp;
    }
    C.request=function(type,method,url,success,error){
        var r;
        switch(type){
            case "script":
                r =document.createElement("SCRIPT");
                r.src = url;
                r.onload=success;
                r.onerror=error;
                document.head.appendChild(r);
                break;
            default:
                throw "type must be specified";
        }
    };
    C.load = function(scriptCollection,callback){
        var DO = function(scriptCollection){
            var current;
            C.request("script",null,current = scriptCollection.shift(),function(){
                if(scriptCollection.length>0){
                    return DO(scriptCollection);
                }else{
                   return callback();
                }
            },function(){
                throw "".concat("failed to load ",current);
            });
        };
        if(scriptCollection.length>0){
            return DO(scriptCollection);
        }
    };
ns.Charge = C;
    /**
     * @note @requirejs rendre un module compatible avec requirejs et amd
     */
if(typeof module!=undefined && typeof exports !=undefined ){
    module.exports = C;
}
})(this);