React结合Redux的使用

React结合Redux的使用

搭建环境

安装react

• 全局安装create-react-app

npm install -g create-react-app

• 创建目录

create-react-app react-redux

• 进入目录

cd react-redux

• 运行

npm start

安装react-redux

• 装到配置文件里面

npm install react-redux --save

如果这条命令安装不上的话，可以使用cnpm安装；

编写代码

创建文件

• component文件夹，创建Calc.js文件

Calc.js

import React from 'react';

const Calc = (props) => {
    let{number,onPlus,onMinus,onOdd,onAnync}=props;
    return (
        <div>
           <span id="spanResult">{number}</span>
            <br/>
            <input id="btn1" type="button" value="plus" onClick={onPlus}/>
            <input id="btn2" type="button" value="minus" onClick={onMinus}/>
            <input id="btn3" type="button" value="if odd plus" onClick={onOdd}/>
            <input id="btn4" type="button" value="anync plus" onClick={onAnync}/> 
        </div>
    );
};

export default Calc;

• container文件夹，创建CalcContainer.js文件

CalcContainer.js

import React from 'react';
import Calc from '../component/Calc';
import {connect} from 'react-redux';

const mapStoretoProps=(state,ownProps)=>{
    return{
        number:state
    }
}

const mapdispatchToProps=((dispatch,ownProps)=>{
   return{
        onPlus:()=>{
        dispatch({
        type:"plus"
        })
    },onMinus:()=>{
        dispatch({
            type:"jian"
            })
    },onOdd:()=>{
        dispatch({
            type:"odd_plus"
            })
    },onAnync:()=>{
        setTimeout(function(){
            dispatch({
                type:"async_plus"
            })
            },1000)
         }
    }
})

let CalcContainer=connect(mapStoretoProps,mapdispatchToProps)(Calc);

export default CalcContainer;

• reducer文件夹，创建index.js文件

index.js

function reducer(state=0,action){
            switch(action.type){
                case "plus":{
                    state=state+1;
                    break;
                }
                case "jian":{
                    state=state-1;
                    break;
                }
                case "odd_plus":{
                    if(state%2===1){
                        state+=1;
                    }
                    break;
                }
                case "async_plus":{
                   state=state+1;
                    break;
                }
                default:{
                  break;
                }
            }
            return state;
        }

export default reducer;

• App.js文件

import React,{ Component } from 'react';

import Calc from './component/Calc';

import CalcContainer from './container/CalcContainer';


class App extends Component {
  constructor(props){
      super();
  }

  render() {
    return (
        
          <CalcContainer>
            <Calc />
          </CalcContainer>
    );
  }
}

export default App;

• index.js文件

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

let store =createStore(reducer);

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

接下来就让我们看看效果吧：