如何更改react.js中的另一个reducer的状态？

如何在SideBarReducer中更改MenuReducer的状态？这意味着当用户在边栏中执行操作时在菜单中显示警告消息。用户将来也会在其他减速器中执行操作，这会导致MenuReducer中的警告弹出。如何更改react.js中的另一个reducer的状态？

MenuReducer：

import actionTypes from '../action-types'; 

export const initialState = { 
    showWarning: false, 
}; 

export default function MenuReducer(state = initialState, action) { 
    switch (action.type) { 
    case actionTypes.REQUEST_REFRESH: 
     if (action.payload.unsavedChanges) { 
     return { ...state, showWarning: true }; 
     } 
    default: 
     return state; 
    } 
}

SidebarReducer：

import actionTypes from '../action-types'; 

export default function sideBarReducer(state = initialState, action) { 
    switch (action.type) { 
    case actionTypes.REQUEST_CLOSE: 
     if (action.payload.unsavedChanges) { 
     // Change the state of MenuReducer 
     } 
    default: 
     return state; 
    } 
}

来源

2016-12-27 Jim Peeters