code: function (runtime, mod) {
              if (mod.status != LOADED) {
                  return;
              }
  
              var fn = mod.fn;
  
              if (typeof fn === 'function') {
                  // 需要解开 index，相对路径
                  // 但是需要保留 alias，防止值不对应
                  mod.value = fn.apply(mod, Utils.getModules(runtime, mod.getRequiresWithAlias()));
              } else {
                  mod.value = fn;
              }
  
              mod.status = ATTACHED;
          }
docs: Attach specified mod.
  @param runtime Module container, such as KISSY
  @param {KISSY.Loader.Module} mod module instance