code: function (modName, cfg) {
              modName = addIndexAndRemoveJsExtFromName(modName);
  
              var mods = Env.mods,
                  module = mods[modName];
  
              if (module) {
                  return module;
              }
  
              // 防止 cfg 里有 tag，构建 fullpath 需要
              mods[modName] = module = new Loader.Module(mix({
                  name: modName
              }, cfg));
  
              return module;
          }
docs: create single module info
  @param {String} modName to be created module name
  @param {Object} [cfg] module config
  @return {KISSY.Loader.Module}