Question

以下是我的本机应用程序的文件：

UserReducer.js

import { ActionTypes } from '../actions/ActionConstants';

export default function UserReducer(state = {}, action) {
  switch (action.type) {
    case ActionTypes.LOGIN_REQUEST:
      return {
        ...state
      };
    case ActionTypes.LOGIN_SUCCESS:
      return {
        ...state
      };
    case ActionTypes.LOGIN_FAILURE:
      return {};
    case ActionTypes.LOGOUT:
      return {};
    default:
      return state
  }
}

RootReducer.js

import { combineReducers } from 'redux';
import UserReducer from './UserReducer';

const rootReducer = combineReducers({
    user: UserReducer,
});

export default rootReducer;

在reducers文件夹中的

index.js

import { createStore, applyMiddleware } from 'redux';
import thunkMiddleware from 'redux-thunk';
import { createLogger } from 'redux-logger';
import rootReducer from './RootReducer';

const loggerMiddleware = createLogger();

export const store = createStore(
    rootReducer,
    applyMiddleware(
        thunkMiddleware,
        loggerMiddleware
    )
);

通过react-native run-android运行我的应用程序。 UserReducer的默认导出给我这个错误：（0，_reducers2.default）不是一个函数

Answer 1

尝试这种方式（没有功能名称的箭头功能）：

/// <summary>
/// A <see cref="System.Windows.Forms.CheckBox"/> with the ability to reverse the checkstate order.
/// </summary>
/// <seealso cref="System.Windows.Forms.CheckBox" />
public class CheckBoxReversible : CheckBox
{
    private bool FInvertCheckStateOrder;

    /// <summary>
    /// Gets or sets a value indicating whether to invert the check state order from [Indeterminate->Unchecked->Checked] to [Indeterminate->Checked->Unchecked].
    /// </summary>
    /// <value>
    ///   <c>true</c> to invert the check state order; otherwise, <c>false</c>.
    /// </value>
    public bool InvertCheckStateOrder
    {
        get { return FInvertCheckStateOrder; }
        set { FInvertCheckStateOrder = value; }
    }

    /// <summary>
    /// Löst das <see cref="E:System.Windows.Forms.Control.Click" />-Ereignis aus.
    /// </summary>
    /// <param name="e">Eine Instanz der <see cref="T:System.EventArgs" />-Klasse, die die Ereignisdaten enthält.</param>
    protected override void OnClick(EventArgs e)
    {
        if (this.InvertCheckStateOrder)
        {
            if (this.CheckState == CheckState.Indeterminate)
                this.CheckState = CheckState.Checked;
            else
                if (this.CheckState == CheckState.Checked)
                    this.CheckState = CheckState.Unchecked;
                else
                    if (this.CheckState == CheckState.Unchecked)
                        this.CheckState = this.ThreeState ? CheckState.Indeterminate : CheckState.Checked;
        }
        else
            base.OnClick(e);
    }
}

请让我知道这是否正确。

错误：（0，_reducers2.default）不是我的本机应用程序中的函数

1 个答案: