大神就是牛

const createStore = (reducer) => {
    let state;
    let listeners = [];
    const getState = () => state;

    const dispatch = (action) => {
        state = reducer(state, action);
        listeners.forEach(listener => listener());
    };

    const subscribe = (listener) => {
        listeners.push(listener);
        return () => {
            listeners = listeners.filter(l => l !== listener);
        };
    };

    dispatch({});

    return {getState, dispatch, subscribe};
};

学习如何在20行建立一个合理的近似Redux Store

原文