1. let createStore = (reducer) => {
    2.     let state;
    3.     //获取状态对象
    4.     //存放所有的监听函数
    5.     let listeners = [];
    6.     let getState = () => state;
    7.     //提供一个方法供外部调用派发action
    8.     let dispath = (action) => {
    9.         //调用管理员reducer得到新的state
    10.         state = reducer(state, action);
    11.         //执行所有的监听函数
    12.         listeners.forEach((l) => l())
    13.     }
    14.     //订阅状态变化事件，当状态改变发生之后执行监听函数
    15.     let subscribe = (listener) => {
    16.         listeners.push(listener);
    17.     }
    18.     dispath();
    19.     return {
    20.         getState,
    21.         dispath,
    22.         subscribe
    23.     }
    24. }
    25. let combineReducers=(renducers)=>{
    26.     //传入一个renducers管理组，返回的是一个renducer
    27.     return function(state={},action={}){
    28.         let newState={};
    29.         for(var attr in renducers){
    30.             newState[attr]=renducers[attr](state[attr],action)
    32.         }
    33.         return newState;
    34.     }
    35. }
    36. export {createStore,combineReducers};