code: function refreshInstance (
    instanceId,
    data
  ) {
    var instance = instanceOptions[instanceId];
    if (!instance || !(instance.app instanceof instance.Vue)) {
      return new Error(("refreshInstance: instance " + instanceId + " not found!"))
    }
    if (instance.Vue && instance.Vue.set) {
      for (var key in data) {
        instance.Vue.set(instance.app, key, data[key]);
      }
    }
    // Finally `refreshFinish` signal needed.
    instance.document.taskCenter.send('dom', { action: 'refreshFinish' }, []);
  }
docs: Refresh an instance with id and new top-level component data.
  It will use `Vue.set` on all keys of the new data. So it's better
  define all possible meaningful keys when instance created.