React项目引入React-router

安装React-router:

cnpm i react-router-dom --save

 

一、最基本示例:

 

在src目录下有index.js、app.js,再新建index.redux.js,分别修改这几个文件的内容如下:

 

index.js:

import React from 'react';
import ReactDOM from 'react-dom';
import { createStore, applyMiddleware, compose } from 'redux';
import thunk from 'redux-thunk'
import { Provider } from 'react-redux'
import { BrowserRouter, Route, Link } from 'react-router-dom'

import App from './App';
import { counter } from './index.redux'

// 新建Store,并且以组件属性的形式传入组件里:
const store = createStore(counter, compose(
  applyMiddleware(thunk),
  window.devToolsExtension ? window.devToolsExtension() : () => {}
)) //compose可以组合函数

applyMiddleware(thunk)

function Erying() {
  return <h2>二营</h2>
}
function Qibinglian() {
  return <h2>骑兵连</h2>
}

ReactDOM.render(
  (<Provider store={store}>
    <BrowserRouter>
      <ul>
        <li>
          <Link to='/'>一营</Link>
        </li>
        <li>
          <Link to='/erying'>二营</Link>
        </li>
        <li>
          <Link to='/qibinglian'>骑兵连</Link>
        </li>
      </ul>
      <div>
        <Route path='/' exact component={App}></Route>
        <Route path='/erying' component={Erying}></Route>
        <Route path='/qibinglian' component={Qibinglian}></Route>
      </div>
    </BrowserRouter>
  </Provider>),
  document.getElementById('root')
); 

 

app.js:

import React from 'react'
import { connect } from 'react-redux'
import { addGun, removeGun, addGunAsync } from './index.redux'

@connect(
  // 把state什么属性放到props里:
  state => ({num: state}),
  // 把state中的什么方法放到props里,会自动dispatch:
  { addGun, removeGun, addGunAsync },
)
class App extends React.Component {
  // constructor(props) {
  //   super(props)
  // }
  render() {
    // 通过属性获取store以及addGun、removeGun这两个操作函数,再通过store获取初始状态和dispatch方法:
    return (
      <div>
        <h1>现在有机枪{this.props.num}把</h1>
        <button onClick={this.props.addGun}>申请武器</button>
        <button onClick={this.props.removeGun}>上交武器</button>
        <button onClick={this.props.addGunAsync}>拖两天再给</button>
      </div>
    )
  }
}

export default App

 

index.redux.js:

// 定义常量:
const ADD_GUN = '加机关枪'
const REMOVE_GUN = '减机关枪'

// reducer:
export function counter(state = 0, action) {
  switch (action.type) {
    case ADD_GUN:
      return state + 1
    case REMOVE_GUN:
      return state - 1
    default:
      return 10
  }
}

// 把对象变成函数返回值:
// action creator,专门创建action:
export function addGun() {
  return {type: ADD_GUN}
}
export function removeGun() {
  return {type: REMOVE_GUN}
}

// 只要提交action,reducer就会执行,reducer会获取现在的状态和action,action就是{type: ADD_GUN}或{type: REMOVE_GUN},然后判断type,处理完返回新的状态,当状态变化时,用subscribe订阅drender函数会重新执行,重新渲染整个页面

export function addGunAsync() {
  return dispatch => {
    setTimeout(() => {
      dispatch(addGun())
    }, 2000)
  }
}

 

二、其他组件:

 

在src目录下有index.js、app.js、index.redux.js,修改index.js的内容如下:

 

index.js:

import React from 'react';
import ReactDOM from 'react-dom';
import { createStore, applyMiddleware, compose } from 'redux';
import thunk from 'redux-thunk'
import { Provider } from 'react-redux'
import { 
  BrowserRouter, 
  Route, 
  Link, 
  Redirect,
  Switch
} from 'react-router-dom'

import App from './App';
import { counter } from './index.redux'

// 新建Store,并且以组件属性的形式传入组件里:
const store = createStore(counter, compose(
  applyMiddleware(thunk),
  window.devToolsExtension ? window.devToolsExtension() : () => {}
)) //compose可以组合函数

applyMiddleware(thunk)

function Erying() {
  return <h2>二营</h2>
}
function Qibinglian() {
  return <h2>骑兵连</h2>
}

class Test extends React.Component {
  constructor(props) {
    super(props)
  }
  render() {
    console.log(this.props)
    // this.props.history.push('/')
    return <h2>测试组件 {this.props.match.params.location}</h2>
  }
}

ReactDOM.render(
  (<Provider store={store}>
    <BrowserRouter>
      <div>
        <ul>
          <li>
            <Link to='/'>一营</Link>
          </li>
          <li>
            <Link to='/erying'>二营</Link>
          </li>
          <li>
            <Link to='/qibinglian'>骑兵连</Link>
          </li>
        </ul>


        <Switch>
          <Route path='/' exact component={App}></Route>
          <Route path='/erying' component={Erying}></Route>
          <Route path='/qibinglian' component={Qibinglian}></Route>

          {/*Route组件可用冒号标识参数:*/}
          <Route path='/:location' component={Test}></Route>

          {/*Redirect组件可以跳转:*/}
          <Redirect to='/qibinglian'></Redirect>
        </Switch> {/*只渲染命中的第一个Route*/}
      </div>
    </BrowserRouter>
  </Provider>),
  document.getElementById('root')
); //Provider组件在应用最外层,传入store,并且只需要用一次,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

 

posted @ 2021-03-10 21:36  starlog  阅读(605)  评论(0编辑  收藏  举报