code: function actionCreator(type, payload, meta) {
    var data = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
  
    var action = _objectSpread({
      type: type,
      payload: payload
    }, data);
  
    if (payload instanceof Error) {
      action.error = true;
    }
  
    if (meta) {
      action.meta = meta;
    }
  
    return action;
  }
docs: 创建 action
  @param {String} type action 类型
  @param {*} payload 数据载体
  @param {*} meta 元信息
  @param {Object} data 其它数据