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                Provider這個組件的作用: 它是react-redux的核心組件,它可以將store提供給它里面的每一個組件 ~~~ import {Provider} from 'react-redux'; import store from './store'; const App ={ <Provider store={store}> <App/> </Provider/> } ~~~ 但是只提供是不行的,如果組件想和store連接,還需要connect組件 ~~~ //App.js組件 import {connect} from 'react-redux'; //怎么連接,connect方法接受三個參數 const mapStateToProps =(state)=>{ return { inputValue:state.inputValue } } const mapDispatchProps=(dispatch)=>{ return { changeInputValue(e){ const action = { type:'inputChange', value:e.target.value } dispatch(action) } } } export default connect(mapStateToProps,mapDispatchProps)(App) //mapStateToProps表示將store的數據和組件的數據作映射 //將dispatch方法和store中的數據作關聯 mapDispatchProps // 可以讓props的方法,派發action,操作store中的數據 ~~~
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