redux

//redux 整 个应用只有一个仓库，整 个仓库只有一个状态state

function createStore(reducer) {
    let state;
    let listeners = [];
    function subscribe(listener) {
        listeners.push(listener);
    }
    function getState() {
        return state;
    }
    function dispatch(action) {
        state = reducer(state, action);
    }
    return {
        getState,
        dispatch,
        subscribe
    }
}

let reducer = function () {

}
let store = createStore(reducer);