code: function(name, realpath) {
          if (regAlias.test(name)) {
              if ($.isUndefined(realpath)) {
                  return mapAlias[name];
              }
              mapAlias[name] = String(realpath).split(',');
          } else if ($.isObject(name)) {
              realpath = name.path;
              name = name;
              _.alias(name, realpath);
          }
      }
docs: 别名机制
  @param  {String} name 名字
  @param  {String} realpath  别名真实url
  @return {[type]}      [description]