这篇文章主要介绍了关于React+mongodb的使用与配置，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

React环境搭建（一步一步走）

React 基本配置

（React 是一个用于构建用户界面的 JAVASCRIPT 库。React主要用于构建UI，很多人认为 React
是 MVC 中的 V（视图）。）

虽然网上有很多教程（但是自己搭建会遇到一些坑所以自己去解决从中体会到自己的不足）

npm install -g create-react-app 全局安装
create-react-app react_mongodb (这个我的项目名)
下面是我的安装过程

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4.进入项目 npm start 看到以下效果说明项目已经搭建成功了

2116975101-5b46bc2286837_articlex[1].png

5.给大家分析一下目录结构易懂

2091548278-5b46bd7048f7f_articlex[1].png

6.打开webpack配置（npm run eject）或者自己配置
运行命令后看到以下目录

735270793-5b46bf489b503_articlex[1].png

redux基本使用

带领大家入门 redux

1> 首先下载 npm i redux --save
2> 当我们看过redux的例子过后现在我们把代码拆分

3> 同步异步介绍 (react处理异步需要 redux-thunk插件)

   * redux.js
         const ADD = '嘻嘻'
         const REMOVE = '呵呵'
         
         // reducer
         export function counter(state = 0, action) {
             switch (action.type) {
                 case ADD:
                     return state + 1;
                 case REMOVE:
                     return state - 1;
                 default:
                     return 10;
             }
         }
         
         // action creator
         export function addgun() {
             return { type: ADD }
         }
         
         export function removegun() {
             return { type: REMOVE }
         }
         
         // 异步函数操作
         export function addgunAsync() {
             return dispatch => { // dispatch参数
                 setTimeout(() => {
                     dispatch(addgun())
                 }, 2000)
             }
         }
     
     
   * 在index.js中引入
         import React from 'react';
         import ReactDOM from 'react-dom';
         import { createStore, applyMiddleware } from 'redux'; // applyMiddleware 处理中间键
         import thunk from 'redux-thunk';  // 中间键
         import registerServiceWorker from './registerServiceWorker';
         import App from './App';
         
         import { counter, addgun, removegun, addgunAsync } from './redux';
         
         // 创建一个store counter执行reducer方法
         const store = createStore(counter, applyMiddleware(thunk))
         // const store = createStore(counter)
         
         function render() {
             ReactDOM.render(<App store={store} addgun={addgun} removegun={removegun} addgunAsync={addgunAsync} />, document.getElementById('root'));
         }
         render()
         
         // 更新后重新渲染
         store.subscribe(render)
         // ReactDOM.render(<App />, document.getElementById('root'));
         registerServiceWorker();

   * App.js 组件
       import React, { Component } from 'react';

         export default class App extends Component {
             render() {
                 const store = this.props.store
                 const num = store.getState()
         
                 // 由父组件中传入
                 const addgun = this.props.addgun
                 const removegun = this.props.removegun
                 const addgunAsync = this.props.addgunAsync
                 return (
                     <p>
                         <h1>
                             hello
                             <br />
                             {num}
                         </h1>
                         <button onClick={()=> store.dispatch(addgun())}>加一</button>
                         <button onClick={()=> store.dispatch(removegun())}>减一</button>
                         <button onClick={()=> store.dispatch(addgunAsync())}>异步添加</button>
                     </p>
                 )
             }
         }

 * 这里你可以打开浏览器查看效果

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react-redux使用安装npm i react-redux -S(是--save的简写)

  Provider 组件应用在最外层, 传入store,只调用一次
  connect 负责从外部获取组件需要的参数
  connect 可以用装饰器的方式来写

  & 下面是修改过的代码: 依然使用redux.js
  
    修改了**App.js index.js**
    
        index.js
             import React from 'react';
             import ReactDOM from 'react-dom';
             import { createStore, applyMiddleware, compose } from 'redux'; // applyMiddleware 处理中间键
             import thunk from 'redux-thunk';  // 中间键
             import { Provider } from 'react-redux';
             import registerServiceWorker from './registerServiceWorker';
             import App from './App';
             
             import { counter } from './redux';
             
             // 创建一个store counter执行reducer方法
             const store = createStore(counter, compose(
                 applyMiddleware(thunk),
                 window.devToolsExtension ? window.devToolsExtension() : f => f
             ))
             
             ReactDOM.render(
                 <Provider store={store}>
                     <App />
                 </Provider>,
                 document.getElementById('root'));
             registerServiceWorker();

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           App.js 组件
                import React, { Component } from 'react';
                // 连接使用
                import { connect } from 'react-redux';
                import { addgun, removegun, addgunAsync } from './redux/index.redux';
                class App extends Component {
                    render() {
                        return (
                            <p>
                                <h1>
                                    hello
                                    <br />
                                    {this.props.num}
                                </h1>
                                <button onClick={this.props.addgun}>加一</button>
                                <button onClick={this.props.removegun}>减一</button>
                                <button onClick={this.props.addgunAsync}>异步添加</button>
                            </p>
                        )
                    }
                }
                
                const mapStatetoProps = (state)=> {
                    return { num: state }
                }
                const actionCreators = { addgun, removegun, addgunAsync }
                // 装饰器的使用 connect  链接过后可以用  this.props 获取
                App = connect(mapStatetoProps, actionCreators)(App)
                export default App;
  
        ** 这里是不是感觉比store.subscribe方便一点

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2169363067-5b4846bd4f8a4_articlex[1].png

        (调试react  推荐谷歌插件 Redux DevTools) 在谷歌商店下载需要翻墙

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react-router4

1302327887-5b484843043d3_articlex[1].png

 *注意点*： 下载router包   npm i react-router-dom --save
             react-router-dom 也有2个路由参数  
                 HashRouter（带#路由）
                 BrowserRouter （不带#号） 如果使用这种路由 和Vue一样需要后台配置
    
    下面提供代码 供朋友参考：
        import React from 'react';
        import ReactDOM from 'react-dom';
        import registerServiceWorker from './registerServiceWorker';
        import { createStore, applyMiddleware, compose } from 'redux'; // applyMiddleware 处理中间键
        import thunk from 'redux-thunk';  // 中间键
        import { Provider } from 'react-redux';
        import { BrowserRouter, Route, Link, Redirect, Switch } from 'react-router-dom';
        import App from './App';
        
        import { counter } from './redux/index.redux';
        
        // 创建一个store counter执行reducer方法
        const store = createStore(counter, compose(
            applyMiddleware(thunk),
            window.devToolsExtension ? window.devToolsExtension() : f => f
        ))
        
        class about extends React.Component {
            render () {
                return (
                    <h1>关于详情: {this.props.match.params.id}</h1>
                )
            }
        }
        
        function home() {
            return <h1>我的详情</h1>
        }
        
        ReactDOM.render(
            (
                <Provider store={store}>
                    <BrowserRouter>
                        <p>
                            <ul>
                                <li>
                                    <Link to="/">嘻嘻嘻</Link>
                                </li>
                                <li>
                                    <Link to="/about">关于</Link>
                                </li>
                                <li>
                                    <Link to="/home">我的</Link>
                                </li>
                            </ul>
                            <Switch>
                                {/* {Switch} 默认只会匹配第一个 */}
                                <Route path="/" exact component={App}></Route>
                                <Route exact path=&#39;/about/:id&#39; component={about} />
                                {/* match.params.id 取值 */}
                                <Route path="/home" component={home}></Route>
                            </Switch>
                        </p>
                    </BrowserRouter>
                    {/* <App /> */}
                </Provider>
            ),
            document.getElementById('root'));
            registerServiceWorker();
            
       *

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react-router4与其他版本跳转不一致

       
     如果使用一下跳转方式 会包错 push
     this.props.history.push('/about')
           
          在4.x 中提供了一个高阶组件  withRouter
          
          import { withRouter } from "react-router-dom";

          eg: 以下事例
          
            import React, { Component } from 'react';
            import { withRouter } from "react-router-dom";
            
            class Info extends Component {
                handleClick() {
                    this.props.history.push('/about')
                }
                render() {
                    return (
                        <button onClick={() => this.handleClick()}>加一</button>
                    )
                }
            }
            
            export default withRouter(Info);
          
          
          后续更新全部！！！！

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