code: function (module, config) {
              var ret = {
                  url: (config.root||'')+module,
                  version: (config.ver||_o)[module]
              };
              // convert xxx.html to xxx_ver.html
              if (!!config.mode&&!!ret.version){
                  ret.url = ret.url.replace(
                      /(\.[^.\/]*?)$/,
                      '_'+ret.version+'$1'
                  );
                  ret.version = null;
              }
              return ret;
          }
docs: parse module url config - ver,root,mode