尚硅谷-react教程-求和案例-优化2-Provider组件的使用-笔记

在这篇文章的基础上，https://blog.csdn.net/weixin_41987016/article/details/143257435?spm=1001.2014.3001.5501 

继续优化， 借助Provider批量的给整个应用里面的所有的容器组件的添加store

• 原来的,src/index.js

import React from "react";
import ReactDOM from 'react-dom'
import App from './App'
 
import store from './redux/store'
 
ReactDOM.render(<App/>,document.getElementById('root'))
// 监测edux中状态的改变，如redux的状态发生了改变，那么重新渲染App组件
store.subscribe(()=>{
    ReactDOM.render(<App/>,document.getElementById('root'))
})

• 优化后的,src/index.js

import React from "react";
import ReactDOM from 'react-dom'
import App from './App'

import store from './redux/store'
import {Provider} from 'react-redux'

ReactDOM.render(
    // 借助Provider批量的给整个应用里面的所有的容器组件的添加store
    <Provider store={store}>
        <App/>
    </Provider>,
    document.getElementById('root')
)

/* 删除这段代码，改用Provider
// 监测edux中状态的改变，如redux的状态发生了改变，那么重新渲染App组件
// ReactDOM.render(<App/>,document.getElementById('root'))
// store.subscribe(()=>{
//     ReactDOM.render(<App/>,document.getElementById('root'))
// })
*/

• 原来的，src/App.jsx

import React, {Component} from 'react';
import Count from "./containers/Count";
// 引入store
import store from "./redux/store";
class App extends Component {
    render() {
        return (
            <div>
                {/*给容器组件传递store*/}
                <Count store={store}/>
            </div>
        );
    }
}
 
export default App;

• 优化后的，src/App.jsx

import React, {Component} from 'react';
import Count from "./containers/Count";

class App extends Component {
    render() {
        return (
            <div>
                <Count/>
            </div>
        );
    }
}

export default App;