Created
June 15, 2020 19:55
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redux counter app
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| import React from 'react' | |
| import ReactDOM from 'react-dom' | |
| import { createStore } from 'redux' | |
| import { Provider } from 'react-redux' | |
| import { useDispatch } from 'react-redux' | |
| import './index.css' | |
| const counterReducer = (state = 0, action) => { | |
| switch (action.type) { | |
| case 'INCREMENT': | |
| return state + 1 | |
| case 'DECREMENT': | |
| return state - 1 | |
| case 'ZERO': | |
| return 0 | |
| default: | |
| return state | |
| } | |
| } | |
| const store = createStore(counterReducer) | |
| const App = () => { | |
| const dispatch = useDispatch() | |
| return ( | |
| <div> | |
| <div>{store.getState()}</div> | |
| <button onClick={dispatch(counterReducer({ type: 'INCREMENT' }))}> | |
| plus | |
| </button> | |
| <button onClick={dispatch(counterReducer({ type: 'DECREMENT' }))}> | |
| minus | |
| </button> | |
| <button onClick={dispatch(counterReducer({ type: 'ZERO' }))}>zero</button> | |
| </div> | |
| ) | |
| } | |
| // RENDER | |
| ReactDOM.render( | |
| <Provider store={store}> | |
| <App /> | |
| </Provider>, | |
| document.getElementById('root') | |
| ) |
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