ts版本react reducer

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定义 

// action-type的类型
export const UPDATE_EXPANDEDROW = 'UPDATE_EXPANDEDROW';
// state的类型
export type RowkeyType = PrimaryTableProps['expandedRowKeys'];
// action的类型
type ExpandAction = { type?: typeof UPDATE_EXPANDEDROW; payload?: RowkeyType };
// reducer 的类型
export type ExpandReducer = React.Reducer<RowkeyType, ExpandAction>;
// 创建上下文实例
export const ExpandContext: Context<{state: RowkeyType;dispatch?: React.Dispatch<ExpandAction>;
}> = createContext({ state: [] });// reducer
export const reducer: ExpandReducer = (state, action) => {switch (action.type) {case UPDATE_EXPANDEDROW:return action.payload;default:return state;}
};

注入 

  const [state, dispatch] = useReducer<ExpandReducer>(reducer, innerExpandRowKeys);return (<ExpandContext.Provider value={{ state, dispatch }}><div> ....</ExpandContext.Provider>);

使用 

 const { dispatch } = useContext(ExpandContext); 
dispatch({ type: UPDATE_EXPANDEDROW, payload: thisExpandRowKeysNew });

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