react-router-dom的使用說(shuō)明
React-Router-Dom
1. React-Router
react-router是一個(gè)核心庫(kù),我們?cè)谧鯬C端時(shí)要用react-router-dom,而在移動(dòng)端我們要用React-Router-Native
2.React-Router-Dom
這個(gè)庫(kù)是專門做PC端的路由
- 2.1 在React-cli項(xiàng)目中安裝React-Router-Dom
npm i react-router-dom
- 2.2 注意
React-Router-Dom最新版本是6,如果下載指定版本加@符
npm i react-router-dom@5
3.React-Router-Dom5
- 3.1 React-Router-Dom的意義
前端路由存在的意義就是單頁(yè)面應(yīng)用,英文:Single Page Application,前端有自己的一套路由,頁(yè)面只有一個(gè)html完成,在不同的路徑下,加載不同的組件,從而完成單頁(yè)面應(yīng)用,在此也可以通過(guò)ajax請(qǐng)求的方式去后端獲得數(shù)據(jù)
- 3.2 注意
React-Router-Dom6在2021年11月已成為默認(rèn)版本
4.React-Router-Dom5基本使用
- 4.1 link和Route
import {Link, Route} from "react-router-dom" <Link to="/about">About</Link> <Link to='/home'>Home</Link> <Switch> <Route path="/about" component={About}/> <Route path="/home" component={Home}/> <Redirect to="/about"/> </Switch>
link要和Route相互搭配,link書寫鏈接,由Route來(lái)注冊(cè)路由
- 4.2 BrowserRouter
在react中我們要用BrowserRouter包裹一下路由,通常在index.js里
import React from 'react'; import ReactDOM from 'react-dom/client'; import './index.css'; import App from './App'; import reportWebVitals from './reportWebVitals'; import {BrowserRouter} from "react-router-dom" const root = ReactDOM.createRoot(document.getElementById('root')); root.render( <React.StrictMode> <BrowserRouter> <App/> </BrowserRouter> </React.StrictMode> ); reportWebVitals();
- 4.3 HashRouter
和BrowserRouter一樣,只不過(guò)HashRoute在url里是有hash值的
import React from 'react'; import ReactDOM from 'react-dom/client'; import './index.css'; import App from './App'; import reportWebVitals from './reportWebVitals'; import {HashRouter} from "react-router-dom" const root = ReactDOM.createRoot(document.getElementById('root')); root.render( <React.StrictMode> <HashRouter> <App/> </HashRouter> </React.StrictMode> ); reportWebVitals();
- 4.4 Switch
在React中相同路徑下是可以加載多個(gè)組件的,假如你不想,你可以用Switch包裹一下Route,這樣即使相同路徑下,也只是加載最上面的組件
<Switch> <Route path="/home/news" component={News}/> <Route path="/home/massage" component={Message}/> <Route path="/home/massage" component={Detail}/> <Redirect to="/home/news"/> </Switch>
上面相同路徑但只加載Message組件
- 4.5 Redirect
在react中我們想在一開始默認(rèn)加載哪個(gè)組件或者路徑不適配的時(shí)候我們可以用Redirect標(biāo)簽,可以給我們重定向加載任何一個(gè)組件,但Redirect一般出現(xiàn)在Route的最下面
<Switch> <Route path="/home/news" component={News}/> <Route path="/home/massage" component={Message}/> <Redirect to="/home/news"/> </Switch>
5.路由的嵌套
- 5.1 NavLink組件
假設(shè)現(xiàn)在我們需要給予選中路由一個(gè)高亮我們可以使用NavLink標(biāo)簽,我們可以把他單獨(dú)封裝成一個(gè)公用的路由組件
import React, {Component, Fragment} from "react" import {NavLink} from 'react-router-dom' import "./MyNavLink.css" export default class MyNavLink extends Component { render() { return ( <Fragment> <div className="btn-div"> <NavLink activeClassName="active" className="btn-a" {...this.props}/> </div> </Fragment> ) } }
注意高亮默認(rèn)在React-Router中式action屬性
- 5.2 路由的嵌套
如果我們想在react項(xiàng)目中,寫入多級(jí)路由的話,我們需要在Link,Route以及Redirect中加入父級(jí)路由
5.2.1 父級(jí)路由組件
import {Fragment} from "react" import {Route, Switch, Redirect} from "react-router-dom" import Title from "./component/Title"; import About from "./pages/About"; import Home from "./pages/Home"; import MyNavLink from "./MyNavLink"; import './App.css'; function App() { return ( <Fragment> <Title/> <MyNavLink to="/about">About</MyNavLink> <MyNavLink to='/home'>Home</MyNavLink> <Switch> <Route path="/about" component={About}/> <Route path="/home" component={Home}/> <Redirect to="/about"/> </Switch> </Fragment> ); } export default App;
5.2.2 子級(jí)路由組件
import React, {Component, Fragment} from "react" import {Switch, Route, Redirect} from 'react-router-dom' import MyNavLink from "../../MyNavLink"; import Message from "./Message"; import News from "./News"; export default class Home extends Component { render() { return ( <Fragment> <h1>我是Home</h1><br/> <MyNavLink to="/home/news">News</MyNavLink> <MyNavLink to="/home/massage">Massage</MyNavLink> <Switch> <Route path="/home/news" component={News}/> <Route path="/home/massage" component={Message}/> <Redirect to="/home/news"/> </Switch> </Fragment> ) } }
- 5.3 路由的匹配
5.3.1路由的模糊匹配
<Fragment> <Title/> <MyNavLink to="/about">About</MyNavLink> <MyNavLink to='/home/a/b'>Home</MyNavLink> <Switch> <Route path="/about" component={About}/> <Route path="/home" component={Home}/> <Redirect to="/about"/> </Switch> </Fragment>
像這樣的路由我們多傳,雖然路徑不匹配但在模糊匹配下可以讓react渲染Home組件,但是不可以頭路徑不正確
例如:
<Fragment> <Title/> <MyNavLink to="/about">About</MyNavLink> <MyNavLink to='/a/home'>Home</MyNavLink> <Switch> <Route path="/about" component={About}/> <Route path="/home" component={Home}/> <Redirect to="/about"/> </Switch> </Fragment>
這樣前面的路徑不對(duì)是匹配不到的
5.3.2路由的嚴(yán)格匹配
假如現(xiàn)在我們不希望進(jìn)行模糊匹配,嚴(yán)格按照路徑的話我們就可以開啟嚴(yán)格匹配模式
<Fragment> <Title/> <MyNavLink to="/about">About</MyNavLink> <MyNavLink to='/a/home'>Home</MyNavLink> <Switch> <Route exact={true} path="/about" component={About}/> <Route exact path="/home" component={Home}/> <Redirect to="/about"/> </Switch> </Fragment>
5.3.3 注意
我們不可以過(guò)多的使用嚴(yán)格模式就像ref一樣,否則會(huì)造成一些問(wèn)題,并且在多級(jí)路由的父路由不可以開啟嚴(yán)格模式
6. 路由的參數(shù)
- 6.1 Params參數(shù)
6.1.1 傳遞Params參數(shù)
this.state.massageArr.map(item => { return <li key={item.id}> <Link to={`/home/massage/detail/${item.id}/${item.title}`}> {item.title} </Link> </li> })
我們通過(guò)數(shù)組的映射以及母版字符串的方式傳遞了兩個(gè)Params參數(shù)
6.1.2 接收Params參數(shù)
<Route path="/home/massage/detail/:id/:title" component={Detail}/>
這樣接收react-router幫我們生成了對(duì)象
6.1.3調(diào)用Params參數(shù)
export default class Detail extends Component { render() { const {id, title} = this.props.match.params const findResult = data.find((_item) => { return _item.id === id }) return ( <Fragment> <ul> <li>id:{id}</li> <li>title:{title}</li> <li>content:{findResult.content}</li> </ul> </Fragment> ) } }
我們可以通過(guò)props里面的match里面封裝的params里面將傳遞的值解構(gòu)出來(lái)使用
- 6.2 Search參數(shù)
6.2.1 傳遞Search參數(shù)
this.state.massageArr.map(item => { return <li key={item.id}> <Link to={`/home/massage/detail?id=${item.id}&title=${item.title}`}> {item.title} </Link> </li> })
同樣我們也傳遞了兩個(gè)Search參數(shù),但注意Search參數(shù)不需要接收
6.2.2 querystring庫(kù)
6.2.2.1 urlencoded編碼
key=value&key=value
像這樣的編碼格式被稱為urlencoded編碼格式
6.2.2.2 利用 querystring轉(zhuǎn)化格式
我們可以轉(zhuǎn)化
import qs from "querystring" qs.stringify() 將對(duì)象轉(zhuǎn)化為urlencoded qs.parse() 將urlencoded轉(zhuǎn)化為js中的對(duì)象
6.2.3 調(diào)用Search參數(shù)
import React, {Component, Fragment} from "react" import qs from "querystring" const data = [ {id: "01", content: "你好,寧夏"}, {id: "02", content: "你好,吉林"}, {id: "03", content: "你好,陜西"}, ] export default class Detail extends Component { render() { const {search} = this.props.location const {id, title} = qs.parse(search.slice(1)) const findResult = data.find((_item) => { return _item.id === id }) return ( <Fragment> <ul> <li>id:{id}</li> <li>title:{title}</li> <li>content:{findResult.content}</li> </ul> </Fragment> ) } }
6.2.4 注意
如果沒(méi)有這個(gè)第三方庫(kù)我們可以安裝
npm i querystring
- 6.3 state參數(shù)
6.3.1 傳遞state參數(shù)
this.state.massageArr.map(item => { return <li key={item.id}> <Link to={{pathname: "/home/massage/detail", state: {id: item.id, title: item.title}}}> {item.title} </Link> </li> })
傳遞state對(duì)象,要把地址和state封裝成一個(gè)對(duì)象
6.3.2 調(diào)用state參數(shù)
import React, {Component, Fragment} from "react" const data = [ {id: "01", content: "你好,寧夏"}, {id: "02", content: "你好,吉林"}, {id: "03", content: "你好,陜西"}, ] export default class Detail extends Component { render() { const {id, title} = this.props.location.state const findResult = data.find((_item) => { return _item.id === id }) return ( <Fragment> <ul> <li>id:{id}</li> <li>title:{title}</li> <li>content:{findResult.content}</li> </ul> </Fragment> ) } }
7.編程式路由導(dǎo)航
- 7.1 編程式路由導(dǎo)航的分類
push是壓棧式的,瀏覽器可以回退,有保存記錄。而replace是覆蓋瀏覽器的棧頂不能回退
- 7.2 replace編程式路由導(dǎo)航
replaceShow = (id, title) => { this.props.history.replace(`/home/massage/detail/${id}/${title}`) }
注意:只有在路由組件內(nèi)才可以拿到這兩個(gè)方法
- 7.3 push編程式路由導(dǎo)航
pushShow = (id, title) => { this.props.history.push(`/home/massage/detail/${id}/${title}`) }
8. withRouter
如果我們想在非路由組件里調(diào)用路由組件的方法我們就可以用withRouter
import React, {Component, Fragment} from "react" import {withRouter} from "react-router-dom" class Title extends Component { back = () => { this.props.history.goBack() } forWord = () => { this.props.history.goForward() } render() { return ( <Fragment> <h2 style={{marginLeft: "50px"}}>React Router Demo</h2> <button onClick={this.forWord}>前進(jìn)</button> <button onClick={this.back}>后退</button> <hr/> </Fragment> ) } } export default withRouter(Title)
注意:goBack為歷史記錄的后退,而goForward為前進(jìn),兩個(gè)函數(shù)后可以在路由組件找到
9. React-Router-Dom6
安裝
npm i react-router-dom@6
- 9.1 概述
內(nèi)置組件以及寫法有些改變,函數(shù)式組件被官方明確推薦,又新增10個(gè)hooks
- 9.2 改變
9.2.1 刪除Switch,新增Routes
import {NavLink, Routes, Route} from "react-router-dom" <Routes> <Route path="/about" element={<About/>}/> <Route path="/home" element={<Home/>}/> </Routes>
9.2.2 重定向
import {NavLink, Routes, Route} from "react-router-dom" <Routes> <Route path="/about" element={<About/>}/> <Route path="/home" element={<Home/>}/> <Route path="/" element={<Navigate to="/about"/>}/> </Routes>
9.2.3 NavLink高亮
<NavLink to="/about" className={({isActive}) => isActive ? "list-group-item active":"list-group-item"}>About</NavLink>
在react-router-dom6中可以用函數(shù)的方式返回出樣式
9.2.4 路由表
import {NavLink, useRoutes} from "react-router-dom" const element = useRoutes(route)
我們可以通過(guò)路由表的方式生成路由
import About from "../pages/About"; import Home from "../pages/Home"; import {Navigate} from "react-router-dom"; export const route = [ { path: "/about", element: <About/> }, { path: "/home", element: <Home/> }, { path: "/", element: <Navigate to="/about"/> } ]
9.2.5 Outlet
多級(jí)路由也可以寫在路由表里,但是需要Outlet配合,類似Vue的roter-view
多級(jí)路由的路由表
import About from "../pages/About"; import Home from "../pages/Home"; import Message from "../pages/Message"; import News from "../pages/News"; import {Navigate} from "react-router-dom"; export const route = [ { path: "/about", element: <About/> }, { path: "/home", element: <Home/>, children: [ { path: "news", element: <News/> }, { path: "message", element: <Message/> } ] }, { path: "/", element: <Navigate to="/about"/> } ]
子路由可以用children來(lái)寫,類型也是數(shù)組,注意路徑不要加 “/”
Outlet是子路由的出口
import React, {Fragment, useState} from "react" import {Navigate,Outlet,NavLink} from "react-router-dom" export default function Home() { const [sum, setSum] = useState(1) return ( <Fragment> <h3>Home</h3> {sum === 2 ? <Navigate to="/about"/> : <h4>當(dāng)前sum為{sum}</h4>} <button onClick={() => setSum(sum + 1)}>點(diǎn)我加一</button> <NavLink to="message">message</NavLink> <NavLink to='news'>news</NavLink> <Outlet/> </Fragment> ) }
- 9.3 Params參數(shù)
9.3.1 傳遞Params參數(shù)
import React, {Fragment, useState} from "react" import {Link, Outlet} from "react-router-dom" export default function Message() { const [message] = useState([ {id: "001", title: "消息1", content: "鋤禾日當(dāng)午"}, {id: "002", title: "消息2", content: "汗滴禾下土"}, {id: "003", title: "消息3", content: "誰(shuí)知盤中餐"}, {id: "004", title: "消息4", content: "粒粒皆辛苦"}, ]) return ( <Fragment> <ul> { message.map((_item) => { return <li><Link to={`detail/${_item.id}/${_item.title}/${_item.content}`}> {_item.title} </Link></li> }) } </ul> <hr/> <Outlet/> </Fragment> ) }
和react-router-dom5版本一樣在路徑后面加
9.3.2接收Params參數(shù)
路由表需要接收Params參數(shù)
import About from "../pages/About"; import Home from "../pages/Home"; import Message from "../pages/Message"; import News from "../pages/News"; import Detail from "../pages/Detail"; import {Navigate} from "react-router-dom"; export const route = [ { path: "/about", element: <About/> }, { path: "/home", element: <Home/>, children: [ { path: "news", element: <News/> }, { path: "message", element: <Message/>, children: [ { path: "detail/:id/:title/:content", element: <Detail/> } ] } ] }, { path: "/", element: <Navigate to="/about"/> } ]
9.9.3 useParams
import React, {Fragment} from "react" import {useParams} from "react-router-dom" export default function Detail() { const {id, title, content} = useParams() return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> </Fragment> ) }
9.9.4 useMatch
import React, {Fragment} from "react" import {useMatch} from "react-router-dom" export default function Detail() { const {id, title, content} = useMatch("/home/message/detail/:id/:title/:content").params return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> </Fragment> ) }
注意useMatch這個(gè)hook要求把整個(gè)路徑全部當(dāng)為參數(shù)傳遞進(jìn)去
- 9.4 Search參數(shù)
9.4.1 傳遞Search參數(shù)
import React, {Fragment, useState} from "react" import {Link, Outlet} from "react-router-dom" export default function Message() { const [message] = useState([ {id: "001", title: "消息1", content: "鋤禾日當(dāng)午"}, {id: "002", title: "消息2", content: "汗滴禾下土"}, {id: "003", title: "消息3", content: "誰(shuí)知盤中餐"}, {id: "004", title: "消息4", content: "粒粒皆辛苦"}, ]) return ( <Fragment> <ul> { message.map((_item) => { return <li key={_item.id}><Link to={`detail?id=${_item.id}&title=${_item.title}&content=${_item.content}`}> {_item.title} </Link></li> }) } </ul> <hr/> <Outlet/> </Fragment> )
注意Search不需要接收
9.4.2 useSearchParams
import React, {Fragment} from "react" import {useSearchParams} from "react-router-dom" export default function Detail() { const [search, setSearch] = useSearchParams() const id = search.get("id") const title = search.get("title") const content = search.get("content") return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> <button onClick={() => { setSearch('id=008&title=哈哈&content=嘻嘻') }}>點(diǎn)我更新Search </button> </Fragment> ) }
這個(gè)hook類似useState,生成兩個(gè),我們需要調(diào)用get方法以及合適的字段,就能拿到相應(yīng)的狀態(tài)
- 9.5 state參數(shù)
9.5.1 傳遞state參數(shù)
import React, {Fragment, useState} from "react" import {Link, Outlet} from "react-router-dom" export default function Message() { const [message] = useState([ {id: "001", title: "消息1", content: "鋤禾日當(dāng)午"}, {id: "002", title: "消息2", content: "汗滴禾下土"}, {id: "003", title: "消息3", content: "誰(shuí)知盤中餐"}, {id: "004", title: "消息4", content: "粒粒皆辛苦"}, ]) return ( <Fragment> <ul> { message.map((_item) => { return <li key={_item.id}><Link to="detail" state={{ id: _item.id, title: _item.title, content: _item.content }} >{_item.title} </Link></li> }) } </ul> <hr/> <Outlet/> </Fragment> ) }
9.5.2 useLocation
import React, {Fragment} from "react" import {useLocation} from "react-router-dom" export default function Detail() { const {state: {id, title, content}} = useLocation() return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> </Fragment> ) }
我們需要連續(xù)解構(gòu)賦值,在useLocation中將狀態(tài)state解構(gòu),再將想要的狀態(tài)從stae中結(jié)構(gòu)
- 9.6 編程式路由導(dǎo)航
9.6.1 useNavigate
import React, {Fragment, useState} from "react" import {Link, Outlet, useNavigate} from "react-router-dom" export default function Message() { const navigate = useNavigate() function showDetail(item) { navigate("detail", { replace: false, state: { id: item.id, title: item.title, content: item.content } }) } const [message] = useState([ {id: "001", title: "消息1", content: "鋤禾日當(dāng)午"}, {id: "002", title: "消息2", content: "汗滴禾下土"}, {id: "003", title: "消息3", content: "誰(shuí)知盤中餐"}, {id: "004", title: "消息4", content: "粒粒皆辛苦"}, ]) return ( <Fragment> <ul> { message.map((_item) => { return <li key={_item.id}><Link to="detail" state={{ id: _item.id, title: _item.title, content: _item.content }} >{_item.title} </Link> <button onClick={() => { showDetail(_item) }}>查看詳情 </button> </li> }) } </ul> <hr/> <Outlet/> </Fragment> ) }
我們要用useNavigate構(gòu)造一個(gè)實(shí)例就是navigate是一個(gè)函數(shù),我們可以傳遞兩個(gè)參數(shù),第一個(gè)是路徑,第二個(gè)是一個(gè)對(duì)象
9.6.2 前進(jìn)和后退
import React, {Fragment} from "react"; import {useNavigate} from "react-router-dom" export default function Title() { const navigate = useNavigate() function back() { navigate(-1) } function forWord() { navigate(1) } return ( <Fragment> <h2 style={{marginLeft: "50px"}}>React Router Demo</h2> <button onClick={forWord}>前進(jìn)-》</button> <button onClick={back}>《-后退</button> <hr/> </Fragment> ) }
我們可以調(diào)用navigate這個(gè)函數(shù),參是是-1是后退,1是前進(jìn)
9.6.3 注意:
如果我們要傳遞state可以放到navigate函數(shù)的第二個(gè)參數(shù)里,別的參數(shù)形式,我們要直接拼接到url里
10. useInRouterContext
該hook是判斷組件是否在路由的上下文中,在返回true,反之false
import React, {Fragment} from "react" import {useLocation, useInRouterContext} from "react-router-dom" export default function Detail() { const {state: {id, title, content}} = useLocation() console.log(useInRouterContext()) return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> </Fragment> ) }
11. useNavigationType
該hook返回的是導(dǎo)航的類型為3種,POP為頁(yè)面刷新,還有PUSH,REPLACE
import React, {Fragment} from "react" import {useLocation, useNavigationType} from "react-router-dom" export default function Detail() { const {state: {id, title, content}} = useLocation() console.log(useNavigationType()) return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> </Fragment> ) }
12. useOutlet
該hook是用來(lái)展現(xiàn)當(dāng)前組件中嵌套的路由組件
import React, {Fragment, useState} from "react" import {Navigate,Outlet,NavLink,useOutlet} from "react-router-dom" export default function Home() { const [sum, setSum] = useState(1) console.log(useOutlet()) return ( <Fragment> <h3>Home</h3> {sum === 2 ? <Navigate to="/about"/> : <h4>當(dāng)前sum為{sum}</h4>} <button onClick={() => setSum(sum + 1)}>點(diǎn)我加一</button> <NavLink to="message">message</NavLink> <NavLink to='news'>news</NavLink> <Outlet/> </Fragment> ) }
注意,若組件子路由組件沒(méi)掛載就返回NULL,反之返回路由對(duì)象
13.useResolvedPath
該hook是幫我們解析路徑的,可以分析出路徑,以及各種參數(shù)
import React, {Fragment} from "react" import {useLocation, useResolvedPath} from "react-router-dom" export default function Detail() { const {state: {id, title, content}} = useLocation() console.log(useResolvedPath()) return ( <Fragment> <ol> <li>{id}</li> <li>{title}</li> <li>{content}</li> </ol> </Fragment> ) }
總結(jié)
以上為個(gè)人經(jīng)驗(yàn),希望能給大家一個(gè)參考,也希望大家多多支持腳本之家。
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