react+redux+router入门总结
react+redux+router入门总结
目录
- 构建配置
- React组件、css module
- React Router 使用
- Redux Redux 使用
- 注意问题
- 资料整理
一、构建配置
1)使用 react-app-rewired 对 create-react-app 的默认配置进行自定义
1、 引入 react-app-rewired 并修改 package.json 里的启动配置。由于新的 react-app-rewired@2.x 版本的关系,你还需要安装 customize-cra
yarn add react-app-rewired customize-cra babel-plugin-import less less-loader --dev
/* package.json */
"scripts": {
- "start": "react-scripts start",
+ "start": "react-app-rewired start",
- "build": "react-scripts build",
+ "build": "react-app-rewired build",
- "test": "react-scripts test",
+ "test": "react-app-rewired test",
}
2、根目录创建 config-overrides.js
const path = require('path');
const { override, fixBabelImports, addLessLoader, addWebpackAlias } = require('customize-cra');
const addWebpackConfig = () => (config) => {
if (process.env.NODE_ENV === 'production') {
config.devtool = false
config.output.publicPath = '//static.kuaizi.co/super-recommend/'
}
return config
}
module.exports = override(
// 按需加载
fixBabelImports('lodash', {
libraryDirectory: '',
camel2DashComponentName: false
}),
// 按需加载
fixBabelImports('import', {
libraryName: 'antd',
libraryDirectory: 'es',
style: true
}),
addLessLoader({
noIeCompat: true,
javascriptEnabled: true,
localIdentName: '[local]--[hash:base64:5]', // 开启less module
modifyVars: { // less 变量
'@primary-color': '#0999aa',
'@success-color': '#45A767',
'@layout-header-background': '#0999aa'
}
}),
addWebpackAlias({
"@": path.resolve(__dirname, "src")
}),
addWebpackConfig()
)
2)PUBLIC_URL
1、添加环境变量到build, dev访问需要配合proxy
/* package.json */
"scripts": {
"build": "PUBLIC_URL=//xxx.cn react-app-rewired build",
}
2、使用
index.html
<script src="%PUBLIC_URL%/common/js/utils.js"></script>
JavaScript
render() {
return <img src={`${process.env.PUBLIC_URL}/common/img/logo.png`} />;
}
3)proxy
1 安装http-proxy-middleware依赖
yarn add http-proxy-middleware --dev
2 在src目录下新建 setupProxy.js
const proxy = require("http-proxy-middleware");
module.exports = function(app) {
app.use(
// api代理
proxy("/api", {
target: "http://xxx.cn",
secure: false,
changeOrigin: true,
pathRewrite: {
"^/api": ""
}
}),
// cnd资源代理
proxy("/common", {
target: "http://xxx.cn",
secure: false,
changeOrigin: true
})
);
};
二、React组件
1)有状态组件 class component
class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
render() {
return (
<div>
<p>You clicked {this.state.count} times</p>
<button onClick={() => this.setState({ count: this.state.count + 1 })}>
Click me
</button>
</div>
);
}
}
2)无状态函数组件
import PropTypes from 'prop-types'
const Example = props => {
const { count, onClick } = props;
return (
<div>
<p>You clicked {count} times</p>
<button onClick={onClick}></button>
</div>
)
}
Example.propTypes = {
count: PropTypes.number,
onClick: PropTypes.func,
}
Example.defaultProps = {
count: 0,
onClick: (() => {})
}
3) HOC高阶组件
HOC(High Order Component) 是 react 中对组件逻辑复用部分进行抽离的高级技术,但HOC并不是一个 React API 。 它只是一种设计模式,类似于装饰器模式。
在 Vue 中通常我们采用: mixins
const DataStorageHoc = WrappedComponent => {
class DataStorage extends React.Component{
state = {
data: null
}
componentWillMount() {
const data = localStorage.getItem('data')
this.setState({ data })
}
render() {
const { forwardedRef, ...rest} = this.props
// 2. 我们接收到 props 中被改名的 forwardedRef 然后绑定到 ref 上
return <WrappedComponent ref={forwardedRef} data={this.state.data} {...rest} />
}
}
return React.forwardRef((props,ref)=>{
// 1. 我们接收到 ref 然后给他改名成 forwardedRef 传入到props中, 因为此ref是保留字段,需要dom元素才能接收
return <DataStorage {...props} forwardedRef={ref} ></DataStorage>
})
}
使用
// example.jsx
import DataStorageHoc from './hoc/data-storage.jsx'
// wrapped component
class Example extends React.Component{
echo = () => {
console.log('hello')
}
render () {
return <h2>{this.props.data}</h2>
}
}
export default DataStorageHoc(Example)
// ================================
// 装饰器(decorator)模式
@DataStorageHoc
class Example extends React.Component{
echo = () => {
console.log('hello')
}
render () {
return <h2>{this.props.data}</h2>
}
}
export default Example
// ================================
// 调用
// app.jsx
class App extends React.Component {
constructor(props){
super(props)
this.exampleRef = React.createRef()
}
handleEcho = () => {
this.exampleRef.current.echo()
}
render() {
return (
<div>
<Example ref={this.exampleRef}></Example>
<button onClick={this.handleEcho}>echo</button>
</div>
)
}
}
export default App
4) hooks是有状态的函数
hook作用: <b>将可复用的最小单元从组件层面进一步细化到逻辑层面。状态逻辑和UI是解耦的。<b>
import { useState } from 'react'
const Example = () => {
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
5) 自定义hooks
function useCount(initialValue = 0) {
const [count, setCount] = useState(initialValue)
useEffect(() => {
service.getInitialCount().then(data => {
setCount(data)
})
return () => {
console.log('计数完成')
}
}, [])
function addCount() {
setCount(c => c + 1)
}
return { count, addCount }
}
function useWindowWidth() {
const [width, setWidth] = useState(window.innerWidth)
useEffect(() => {
const handleResize = () => setWidth(window.innerWidth)
window.addEventListener('resize', handleResize)
return () => {
window.removeEventListener('resize', handleResize)
}
})
return width
}
const App = () => {
const { count, addCount } = useCount(0)
const width = useWindowWidth()
const onChange = (e) => {
handleNameChange(e.target.value)
}
return (
<div>
<p>window width {width}</p>
<p>You clicked {count} times</p>
<button onClick={addCount}>Click me</button>
</div>
)
}
6) css动态样式功能
1、安装
yarn add classnames
2、使用方法
import classnames from 'classnames'
<div className=classnames({
'class1': true,
'class2': true
)>
</div>
// 其他类型
classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', { bar: true }); // => 'foo bar'
classNames({ 'foo-bar': true }); // => 'foo-bar'
classNames({ 'foo-bar': false }); // => ''
classNames({ foo: true }, { bar: true }); // => 'foo bar'
classNames({ foo: true, bar: true }); // => 'foo bar'
7) less module
- 文件名规则 xxx.module.less, 必须以.module.less结尾
- 命名:可以使用驼峰或者连接线命名
index.module.less
.list {
height: 100%;
overflow-y: auto;
}
.listItem {
height: 50px;
}
.itemActive {
color: aqua;
}
.item-disabled {
color: #999;
}
使用样式
import classNames from 'classnames'
import styles from './index.module.less'
const Example = props => {
return (
<ul class={styles.listScroll)}>
<li className={classNames('item', styles.listItem, {styles.itemActive : true})}>...</li>
<li className={classNames('item', styles.listItem, {styles['item-disabled'] : true})}>...</li>
</ul>
)
}
三、React Router
1) 安装
创建 Web应用,使用
yarn add react-router-dom
创建 navtive 应用,使用
yarn add react-router-native
2) 路由模式
BrowserRouter模式 创建的 URL 形式如下:
http://example.com/some/path
HashRouter模式 创建的 URL 形式如下:
http://example.com/#/some/path
3) Route组件
<Route>组件是react router v4里最有用的组件。无论何时你需要在匹配某个路径的时候绘制一个组件,那么就可以使用Route组件。
Route组件可以使用如下的属性:
- path属性,字符串类型,它的值就是用来匹配url的。
- component属性,它的值是一个组件。在path匹配成功之后会绘制这个组件。
- exact属性,这个属性用来指明这个路由是不是排他的匹配 (绝对匹配)。
- strict属性, 这个属性指明路径只匹配以斜线结尾的路径。
还有其他的一些属性,可以用来代替component属性
- render属性,一个返回React组件的方法,只要你的路由匹配了,这个函数才会执行
- children属性,返回一个React组件的方法。只不过这个总是会绘制,即使没有匹配的路径的时候。
使用component
<Route exact path="/" component={HomePage} />
使用render
<Route path="/" render={(props) => (
<HomePage {...props} />
)} />
使用children
<Route path="/" children={(props) => (
<div>children</div>
)} />
exact
http://example.com/#/path
<Route exact path="/" component={HomePage} /> // 不匹配
非exact
http://example.com/#/path
<Route path="/" component={HomePage} /> // 匹配
4)Switch组件
只有第一个匹配的路由<Route>或者<Redirect>会被绘制,匹配到一个就不再匹配
import { Switch, Route } from 'react-router-dom'
<Switch>
<Route exact path="/" component={HomePage} />
<Route path="/about" component={AboutPage} />
<Route component={NotFound} />
</Switch>
5)Link、NavLink、Redirect组件
Link组件需要用到to属性,这个属性的值就是react router要跳转到的地址
NavLink是Link的一个子类,在Link组件的基础上增加了绘制组件的样式
import { Link, NavLink } from 'react-router-dom'
<Link to="/">Home</Link>
<Link to={{
pathname: '/posts',
search: '?sort=name',
hash:'#the-hash',
state: { fromHome: true}
}}></Link>
<NavLink to="/me" activeStyle={{SomeStyle}} activeClassName="selected">
My Profile
</NavLink>
// 重定向
<Redirect to="/register" />
除了使用Link外,我们还可以使用 history 对象手动实现导航。history 中最常用的两个方法是 push(path,[state]) 和 replace(path,[state]),push会向浏览器记录中新增一条记录,replace 会用新记录替换记录。
history.push('/posts')
history.replace('/posts')
6)Router Cache
原理:display "block" "none"
1、安装 react-router-cache-route
yarn add react-router-cache-route --dev
2、使用
import { Route } from 'react-router-dom'
import CacheRoute, { CacheSwitch } from 'react-router-cache-route'
const App = () => {
return (
<CacheSwitch>
<CacheRoute path="/login" exact component={LoginPage} />
<CacheRoute path="/register" exact component={RegisterPage} />
<Route component={NotFoundPage} />
</CacheSwitch>
)
}
7)例子
// app.jsx
import { HashRouter, Route, Switch } form 'react-router-dom'
const MenuLayout = ({ location }) => (
<div className="layout">
<header>
<p>React Router v4 Browser Example</p>
<nav>
<ul>
<li><Link to="/menu/user">User</Link></li>
<li><Link to="/menu/order">Order</Link></li>
</ul>
</nav>
</header>
<div className="container">
<Switch>
<Route path="/menu/user" exact component={AboutPage} />
<Route path="/menu/order" exact component={ProfilePage} />
<Route render={() => <div>404 Not Found</div>} />
</Switch>
</div>
<footer>
React Router v4 Browser Example (c) 2017
</footer>
</div>
)
const App = () => {
return (
<HashRouter>
<Route path="/login" exact component={LoginPage} />
<Route path="/register" exact component={RegisterPage} />
// 不要使用 exact
<Route path="/menu" component={MenuLayout}></Route>
<Route component={NotFoundPage} />
</HashRouter>
)
}
export default App
四、 Redux Redux
1) 定义reducer
redux/action-type.js
export const SET_USER_INFO = 'SET_USER_INFO'
export const SET_USER_LIST = 'SET_USER_LIST'
export const SET_NEWS_LIST = 'SET_NEWS_LIST'
redux/actions.js
import { SET_USER_INFO, SET_NEWS_LIST, SET_USER_LIST } from './action-type'
export const setUserInfo = (data) => {
return {
type: SET_USER_INFO,
data
}
}
export const setUserList = (data) => {
return {
type: SET_USER_LIST,
data
}
}
export const setNewsList = (data) => {
return {
type: SET_NEWS_LIST,
data
}
}
redux/reducers/user.js
import { SET_USER_INFO, SET_USER_LIST } from './action-type'
const initialState = {
userInfo: null,
userList: []
}
const reducer = (state = initialState, action) = {
switch(action.type){
case SET_USER_INFO:
return Object.assign({}, state, {
userInfo: action.data
})
case SET_USER_LIST:
return Object.assign({}, state, {
userList: action.data
})
default:
return state
}
}
export default reducer
redux/reducers/news.js
import { SET_NEWS_LIST } from './action-type'
const initialState = {
newsList: [],
total: 0
}
const reducer = (state = initialState, action) = {
switch(action.type){
case SET_NEWS_LIST:
return Object.assign({}, state, {
newsList: action.data.list,
total: action.data.total
})
default:
return state
}
export default reducer
2) 合并reducer redux/reducers/index.js
import {combineReducers} from 'redux'
import user from './user'
import news from './news'
export default combineReducers({
user,
news
})
3)创建store redux/index.js
import {createStore} from 'redux'
import reducers from './reducers'
// 创建store对象
const store = createStore(reducers)
export default store
4)redux connect, 将react与redux关联起来
connect()接收四个参数,它们分别是mapStateToProps,mapDispatchToProps,mergeProps和options。
-
mapStateToProps 将state映射到 UI 组件的参数(props)
-
mapDispatchToProps 将action映射到 UI 组件的参数(props)
-
mergeProps 选项,如果指定,则定义如何确定自己包装的组件的最终道具。如果不提供mergeProps,则包装的组件默认会收到{...ownProps,...stateProps,...dispatchProps}
-
options 选项
-
[forwardRef = false] 如果已传递{forwardRef:true}进行连接,则向连接的包装器组件添加ref实际上将返回被包装组件的实例。默认为false
-
...
-
connect([mapStateToProps], [mapDispatchToProps], [mergeProps], [options])
5) 使用redux
index.js
import React from 'react'
import ReactDOM from 'react-dom'
import { Provider } from 'react-redux'
import store from './redux'
import App from './App'
ReactDOM.render(
<Provider store={store}>
<App />
</Provider>
document.getElementById('root')
);
App.js
import { connect } from "react-redux"
import { setUserInfo } from '@/redux/action'
const App = (props) => {
const { userInfo, setUserInfo, newsList } = props
const onClick = () => {
setUserInfo({
name: 'oo'
})
}
return (
<div>
<p>{userInfo.name}</p>
<button onClick={onClick}>click</button>
<ul>
{
newsList.map((o) => {
return <li>{o.title}</li>
})
}
</ul>
</div>
)
}
App.defaultProps = {
userInfo: {},
newsList: []
}
const mapStateToProps = (state) => ({
userInfo: state.user.userInfo,
newsList: state.news.newsList
})
const mapDispatchToProps = (dispatch) => ({
setUserInfo: (data) => dispatch(setUserInfo(data))
})
export default connect(
mapStateToProps,
mapDispatchToProps,
null,
{forwardRef: true}
)(App)
五、注意问题
1)ant design Form.create 之后如果拿不到 ref
经过 Form.create 之后如果要拿到 ref,可以使用 rc-form 提供的 wrappedComponentRef,详细内容可以查看这里。
class CustomizedForm extends React.Component { ... }
// use wrappedComponentRef
const EnhancedForm = Form.create()(CustomizedForm);
class Example extends React.Component {
render () {
return (
<EnhancedForm wrappedComponentRef={(form) => this.form = form} />
)
}
}
2) redux connect 之后拿不到ref
connect 之后拿不到ref,配置options.forwardRef=true
class Example extends React.Component { ... }
export default connect(
mapStateToProps,
mapDispatchToProps,
null,
{forwardRef: true}
)(Example)