export default combineReducers({    userinfo,    stores,    home,    likeList})

//创建store的api,也是redux中最重要的api,而创建的store用于管理应用中的所有state,且只有一个storeexport default function createStore(reducer, preloadedState, enhancer) {  //简而言之,第二个参数是函数,并且第三个参数是undefined,然后第二第三个参数值互换  if (typeof preloadedState === 'function' && typeof enhancer === 'undefined') {    enhancer = preloadedState    preloadedState = undefined  }  if (typeof enhancer !== 'undefined') {    //这个就是中间件,看middleware那篇文章    return enhancer(createStore)(reducer, preloadedState)  }  //保存当前的reducer  let currentReducer = reducer  //保存传入的状态  let currentState = preloadedState  //设置当前监听集合  let currentListeners = []  //将当前的监听集合赋值给下一个监听集合  let nextListeners = currentListeners  let isDispatching = false    function ensureCanMutateNextListeners() {    if (nextListeners === currentListeners) {      //slice() 没有参数默认begin为0 就是拷贝下      nextListeners = currentListeners.slice()    }  }  //获取当前状态  //函数嵌套函数,内部函数引用外部函数的变量,最后返回函数,这是闭包  function getState() {    return currentState  }  //增加监听,参数listener是一个回调函数,在dispatch里,会调用所有的监听器  function subscribe(listener) {    let isSubscribed = true    ensureCanMutateNextListeners()    //把新增加的监听加入到当前监听列表中    nextListeners.push(listener)    //返回一个函数,用于去除监听    return function unsubscribe() {      if (!isSubscribed) {        return      }      //解除监听 isSubscribed 设置为false,意为已经取消监听      isSubscribed = false      ensureCanMutateNextListeners()      const index = nextListeners.indexOf(listener)      //然后干掉这个监听      nextListeners.splice(index, 1)    }  }  //这个是比较常用的api=>主要用于触发action,改变状态  function dispatch(action) {    try {      isDispatching = true//正在dispatch      //执行reducer 返回新state,调用的是combination()方法      currentState = currentReducer(currentState, action)    } finally {      // finally不管报没报错最后都要执行      isDispatching = false    }    //执行所有监听    const listeners = (currentListeners = nextListeners)    for (let i = 0; i < listeners.length; i++) {      const listener = listeners[i]      listener()    }    return action  }  //替换reducer 然后更新store  function replaceReducer(nextReducer) {    currentReducer = nextReducer    dispatch({ type: ActionTypes.REPLACE })  }  //这个是留给内部  function observable() {    const outerSubscribe = subscribe    return {      subscribe(observer) {        function observeState() {          if (observer.next) {            observer.next(getState())          }        }        observeState()        const unsubscribe = outerSubscribe(observeState)        return { unsubscribe }      },      [$$observable]() {        return this      }    }  }  //初始化store  dispatch({ type: ActionTypes.INIT })  return {    dispatch,    subscribe,    getState,    replaceReducer,    [$$observable]: observable  }}

const store = createStore(rootReducer, applyMiddleware(...middlewares));复制代码