const initialState = { list: [], }; export default function chat(state = initialState, action) { let { type, data } = action; switch (type) { case 'message/list': return { ...state, list: data }; case 'message/send': return { ...state, list: [...state.list, ...data] }; case 'message/sendKeys': return { ...state, list: [...state.list, ...data] }; default: return state; } }