一、作用

react-redux插件可以使redux的使用变得更加简单。

二、使用

首先，要创建store和reducer

创建store

import { createStore, compose, applyMiddleWare } from 'redux'
import reducer from './reducer'
import thunk from 'redux-thunk'
// 设置调试工具
const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__({}) : compose;
// 设置中间件
const enhancer = composeEnhancers(
  // 使用中间件
  applyMiddleware(thunk)
);
// 创建store
const store = createStore(reducer, enhancer);
// 导出store
export default store;

创建reducer

const defaultState = {
  // some code here
}
export default (state = defaultState, action) => {
  switch(action.type){
    // some code here
    default: return state;
  }
}

然后，要在需要使用store的最上层组件中绑定store

import React, { Component } from 'react'
import { Provider } from 'react-redux'
import 'store' from './store'
class App extends Component{
  render(){
    return (
      <Provider store = { store }>
        { // some code here }
      </Provider>
    )
  }
}
export default App;

最后，在使用store的各部分组件中使用connect将map,dispatch和props绑定并导出

import React, { Component } from 'react'
import { connect } from 'react-redux'
class Header extends Component{
  // 在this.props中可以访问到connect传递过来的属性和方法

  render(){
    //some code here
  }

}
// 将state传递到props，这里的state即store中的state
const mapStateToProps = (state) => ({
  search: state.search,
  //.....
});
// 将dispatch传递到props
const mapDispatchToProps = (dispatch) => ({
  getSearch(){
    dispatch(...)
  },
  // ......
});

export default connect(mapStateToProps, mapDispatchToProps)(Header);