详解react-redux插件入门

npm i react-redux --save

//index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import { reducer } from './index.redux';
import { Provider } from 'react-redux'

const store = createStore(reducer, applyMiddleware(thunk));

ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById('root')
);

registerServiceWorker();

//app.js

import React, { Component } from 'react';
import { addCreator, removeCreator, addAsync } from './index.redux';
import { connect } from 'react-redux';
class App extends Component {
 render() {
  return (
   <div className="App">
    <h1>现在有美女{this.props.num}个。</h1>
    <button onClick={this.props.addCreator}>add</button>
    <button onClick={this.props.removeCreator}>remove</button>
    <button onClick={this.props.addAsync}>addAsync</button>
   </div >
  );
 }
}

//定义把state中哪个属性放到props中
 function mapStateToProps(state) {
  return { num: state }
 }
 //定义把哪些方法放到props中
 const actionCreators={ addCreator, removeCreator, addAsync };
 //connect其实就是一个高阶组件，把app传进去，返回一个新的app组件
 App = connect(mapStateToProps, actionCreators)(App);
export default App;

//react.redux.js

const Add = 'addGirl', Remove = "removeGirl";

export function reducer(state = 0, action) {
  switch (action.type) {
    case Add:
      return state + 1;
    case Remove:
      return state - 1;
    default:
      return 10;
  }
}

export function addCreator() {
  return { type: Add };
}
export function removeCreator() {
  return { type: Remove };
}

export function addAsync() {
  return (dispatch, getState) => {
    setTimeout(function () {
      dispatch(addCreator());
    }, 1000);
  }
}

 "babel": {
  "presets": [
   "react-app"
  ],
  "plugins": [
   ["transform-decorators-legacy"]
  ]
 }

//App.js

@connect((state) => ({ num: state }),{ addCreator, removeCreator, addAsync })
class App extends Component {
.....//省略


// function mapStateToProps(state) {
//  return { num: state }
// }
// App = connect(mapStateToProps, { addCreator, removeCreator, addAsync })(App);

"javascript.implicitProjectConfig.experimentalDecorators": false