// 定義 reducer

const counter = (state = 0, action) =>{

  switch (action.type) {

    case 'INCREMENT':

      return state + 1;

    default:

      return state;

  }

}

​

const { createStore } = Redux;

​

// 產生 store

let store = createStore(counter);

​

// 透過 getState() 取得目前的 state

console.log('---prev state---');

console.log(store.getState());

​

// 透過 dispatch() 發送我們剛剛所定義的 action

store.dispatch({

  type: 'INCREMENT'

});

​

// 看執行後的 state

console.log('---next state---');

console.log(store.getState());