redux state prop得到undefined

Question

我有一个小反应redux应用程序 和我在mapstatetoprops（工作）的状态 是网格的数据数组

const mapStateToProps = state => {
    console.dirxml(state);    
        return {
        work: state.work,
        loading: state.loading
        };
    
};

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

我用数据填充网格（在工作中）， 在下一次调度之后（在不同组件中有不同的操作）“工作”变得未定义

这是减速器：

const initialState = {    
    Data: null,
    work: [],        
    input: []    
};

const rootReducer = (state = initialState, action) => {
    console.info(action.type);
    switch (action.type) {
        case 'FETCH_BEGIN':
            return {
                state,
                loading: true,
                error: null
            };        
        case Cons.INPUTDATA_CREATEJSON:
            return {
                state,
                inputData: action.payload.input,
                message: action.payload.message
            }
        case Cons.GETNAME:  
            state.Data = action.payload.item;
            return {
                state,
                loading: false,
                
            }
        case Cons.FETCHWORK: 
            return {
                state,
                loading: false,
                work: action.payload.items
            }
        case Cons.FETCH_ITEMS_SUCCESS:
            return {
                state,
                loading: false,
                items: action.payload.items
            }
                
        case Cons.FETCH_FAILURE:
            return {
                state,
                loading: false,
                error: action.payload.error,
                items: []
            };
        
        default:
            return state;
    }
};

我可以在mapstatetoprops中看到更深层次状态的“工作”数据，但从更深层次的状态获取数据没有任何意义，所以我认为我的reducer有问题

Answer 1

您应该将减速机更改为：

return {
    ...state,
    other state updation.
};

参考：Spread operator in JS