哪里有网站推广公司微官网入口
目录：
- 对SPA应用的理解
- 对路由的理解
- 前端路由原理
- 路由的基本使用
- 路由组件与一般组件
- NavLink的使用
- 封装NavLink组件
- Switch的使用
- 解决样式丢失问题
- 路由的模糊匹配与严格匹配
- Redirect的使用
- 嵌套路由
- 向路由组件传递params参数
- 向路由组件传递search参数
- .向路由组件传递state参数
- 总结路由参数
- push与repalce
- 编程式路由导航
- withRouter的作用
- BrowserRouter与HashRouter
1.对SPA应用的理解
- 单页Web应用（single page web application，SPA）。
- 整个应用只有一个完整的页面。
- 点击页面中的链接不会刷新页面，只会做页面的局部更新。
- 数据都需要通过ajax请求获取, 并在前端异步展现。
2.对路由的理解
什么是路由?
- 一个路由就是一个映射关系(key:value)
- key为路径, value可能是function或component
路由分类
- 后端路由：
- 理解： value是function, 用来处理客户端提交的请求。
- 注册路由： router.get(path, function(req, res))
- 工作过程：当node接收到一个请求时, 根据请求路径找到匹配的路由, 调用路由中的函数来处理请求, 返回响应数据
- 前端路由：
- 浏览器端路由，value是component，用于展示页面内容。
- 注册路由: <Route path="/test" component={Test}>
- 工作过程：当浏览器的path变为/test时, 当前路由组件就会变为Test组件
3.前端路由原理
前端路由的基石.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>前端路由的基石_history</title>
</head>
<body><a href="http://www.atguigu.com" onclick="return push('/test1') ">push test1</a><br><br><button onClick="push('/test2')">push test2</button><br><br><button onClick="replace('/test3')">replace test3</button><br><br><button onClick="back()"><= 回退</button><button onClick="forword()">前进 =></button><script type="text/javascript" src="https://cdn.bootcss.com/history/4.7.2/history.js"></script><script type="text/javascript">// let history = History.createBrowserHistory() //方法一，直接使用H5推出的history身上的APIlet history = History.createHashHistory() //方法二，hash值（锚点）function push (path) {history.push(path)return false}function replace (path) {history.replace(path)}function back() {history.goBack()}function forword() {history.goForward()}history.listen((location) => {console.log('请求路由路径变化了', location)})</script>
</body>
</html>4.路由的基本使用
- 明确好界面中的导航区、展示区
- 导航区的a标签改为Link标签 <Link to="/xxxxx" >Demo</Link>
- 展示区写Route标签进行路径的匹配<Route path='/xxxx 'component={Demo}/>
- <App>的最外侧包裹了一个<BrowserRouter>或<HashRouter>
App.js
import React, {Component} from 'react';
import {Link, Route} from "react-router-dom";
import About from "./components/About/About";
import Home from "./components/Home/Home";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><div className="page-header"><h2>React Router Demo</h2></div></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><Link className="list-group-item" to="/about">About</Link><Link className="list-group-item" to="/home">Home</Link></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route></div></div></div></div></div>);}
}export default App;index.js
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import {BrowserRouter} from "react-router-dom";const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<BrowserRouter><App/></BrowserRouter>
);About.jsx
import React, {Component} from 'react';class About extends Component {render() {return (<div><h3>我是About的内容</h3></div>);}
}export default About;Home.jsx
import React, {Component} from 'react';class Home extends Component {render() {return (<div><h3>我是Home的内容</h3></div>);}
}export default Home;运行结果：
5.路由组件与一般组件
- 写法不同:
- 一般组件: <Demo/ >
- 路由组件: <Route path="/demo" component={Demo}/>
- 存放位置不同:
- 一般组件:components
- 路由组件: pages
- 接收到的props不同:
- 一般组件:,写组件标签时传递了什么，就能收到什么
- 路由组件:接收到三个固定的属性
- history:
- go: f go(n)
- goBack: f goBack()
- goForward: f goForward()
- push: f push(path,state)
- replace: f replace(path, state)
-
location:
- pathname: "/about"
- search: ""
- state: undefined
-
match:|
- params: {}
- path: "/about"
- url: "/about"
- history:
6.NavLink的使用
Header.jsx
import React, {Component} from 'react';class Header extends Component {render() {// console.log('Header组件收到的props是', this.props)return (<div><div className="page-header"><h2>React Router Demo</h2></div></div>);}
}export default Header;About.jsx
import React, {Component} from 'react';class About extends Component {render() {// console.log('About组件收到的props是', this.props)return (<div><h3>我是About的内容</h3></div>);}
}export default About;Home.jsx
import React, {Component} from 'react';class Home extends Component {render() {return (<div><h3>我是Home的内容</h3></div>);}
}export default Home;App.js
import React, {Component} from 'react';
import {NavLink, Route} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><NavLink activeClassName="atguigu" className="list-group-item" to="/about">About</NavLink><NavLink activeClassName="atguigu" className="list-group-item" to="/home">Home</NavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route></div></div></div></div></div>);}
}export default App;index.js
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import {BrowserRouter} from "react-router-dom";const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<BrowserRouter><App/></BrowserRouter>
);index.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="utf-8"/><link rel="icon" href="%PUBLIC_URL%/favicon.ico"/><meta name="viewport" content="width=device-width, initial-scale=1"/><meta name="theme-color" content="#000000"/><metaname="description"content="Web site created using create-react-app"/><link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png"/><link rel="manifest" href="%PUBLIC_URL%/manifest.json"/><link rel="stylesheet" href="css/bootstrap.css"><style>.atguigu {background-color: orange !important;color: white !important;}</style><title>React App</title>
</head>
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
</body>
</html>
项目结构：
运行结果：
7.封装NavLink组件
NavLink与封装NavLink
- NavLink可以实现路由链接的高亮，通过activeclassName指定样式名
- 标签体内容是一个特殊的标签属性
- 通过this.props.children可以获取标签体内容
App.js
import React, {Component} from 'react';
import {NavLink, Route} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";
import MyNavLink from "./components/MyNavLink/MyNavLink";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><MyNavLink to="/about" a={1} b={2} c={3}>About</MyNavLink><MyNavLink to="/home">Home</MyNavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route></div></div></div></div></div>);}
}export default App;index.js
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import {BrowserRouter} from "react-router-dom";const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<BrowserRouter><App/></BrowserRouter>
);Header.jsx
import React, {Component} from 'react';class Header extends Component {render() {// console.log('Header组件收到的props是', this.props)return (<div><div className="page-header"><h2>React Router Demo</h2></div></div>);}
}export default Header;MyNavLink.jsx
import React, {Component} from 'react';
import {NavLink} from "react-router-dom";class MyNavLink extends Component {render() {console.log(this.props)return (<div><NavLink activeClassName="atguigu" className="list-group-item" {...this.props}/></div>);}
}export default MyNavLink;About.jsx
import React, {Component} from 'react';class About extends Component {render() {// console.log('About组件收到的props是', this.props)return (<div><h3>我是About的内容</h3></div>);}
}export default About;Home.jsx
import React, {Component} from 'react';class Home extends Component {render() {return (<div><h3>我是Home的内容</h3></div>);}
}export default Home;项目结构：
运行结果：
8.Switch的使用
- 通常情况下，path和component是一一对应的关系。
- Switch可以提高路由匹配效率(单一匹配)。
Test.jsx
import React, {Component} from 'react';class Test extends Component {render() {return (<div><h2>Test...</h2></div>);}
}export default Test;App.js
import React, {Component} from 'react';
import {NavLink, Route, Switch} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";
import MyNavLink from "./components/MyNavLink/MyNavLink";
import Test from "./pages/Test/Test";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><MyNavLink to="/about" a={1} b={2} c={3}>About</MyNavLink><MyNavLink to="/home">Home</MyNavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Switch><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route><Route path="/home" component={Test}></Route></Switch></div></div></div></div></div>);}
}export default App;运行结果：
项目结构：
9.解决样式丢失问题
-
public/index.html 中引入样式时不写./写/（常用)
-
public/index.html 中引入样式时不写﹒/写%PUBLIC_URL%（常用)
-
使用HashRouter
1../css/bootstrap.css改为：
<link rel="stylesheet" href="css/bootstrap.css">2../css/bootstrap.css改为：
<link rel="stylesheet" href="%PUBLIC_URL%/css/bootstrap.css">3.BroserRouter改成HashRouter
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import {BrowserRouter, HashRouter} from "react-router-dom";const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<HashRouter><App/></HashRouter>
);10.路由的模糊匹配与严格匹配
- 默认使用的是模糊匹配(简单记:【输入的路径】必须包含要【匹配的路径】，且顺序要一致)
- 开启严格匹配：<Route exact={true} path="/about" component={About}/>
- 严格匹配不要随便开启，需要再开，有些时候开启会导致无法继续匹配二级路由
App.js
import React, {Component} from 'react';
import {Route, Switch} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";
import MyNavLink from "./components/MyNavLink/MyNavLink";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><MyNavLink to="/about">About</MyNavLink><MyNavLink to="/home/a/b">Home</MyNavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Switch><Route exact path="/about" component={About}></Route><Route exact path="/home" component={Home}></Route></Switch></div></div></div></div></div>);}
}export default App;运行结果：
11.Redirect的使用
- 一般写在所有路由注册的最下方，当所有路由都无法匹配时，跳转到Redirect指定的路由
- 具体编码:
<Switch> <Route path="/about" component={About}/> <Route path="/home" component={Home}/> <Redirect to="/about"/> </Switch>
App.js
import React, {Component} from 'react';
import {Redirect, Route, Switch} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";
import MyNavLink from "./components/MyNavLink/MyNavLink";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><MyNavLink to="/about">About</MyNavLink><MyNavLink to="/home">Home</MyNavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Switch><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route><Redirect to="/about"></Redirect></Switch></div></div></div></div></div>);}
}export default App;12.嵌套路由
- 注册子路由时要写上父路由的path值
- 路由的匹配是按照注册路由的顺序进行的
App.js
import React, {Component} from 'react';
import {Redirect, Route, Switch} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";
import MyNavLink from "./components/MyNavLink/MyNavLink";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><MyNavLink to="/about">About</MyNavLink><MyNavLink to="/home">Home</MyNavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Switch><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route><Redirect to="/about"></Redirect></Switch></div></div></div></div></div>);}
}export default App;Message.jsx
import React, {Component} from 'react';class Message extends Component {render() {return (<div><ul><li><a href="/message1">message001</a> </li><li><a href="/message2">message002</a> </li><li><a href="/message/3">message003</a> </li></ul></div>);}
}export default Message;News.jsx
import React, {Component} from 'react';class News extends Component {render() {return (<div><ul><li>news001</li><li>news002</li><li>news003</li></ul></div>);}
}export default News;Home.jsx
import React, {Component} from 'react';
import MyNavLink from "../../components/MyNavLink/MyNavLink";
import {Redirect, Route, Switch} from "react-router-dom";
import News from "./News/News";
import Message from "./Message/Message";class Home extends Component {render() {return (<div><h2>Home组件内容</h2><div><ul className="nav nav-tabs"><li><MyNavLink to="/home/news">News</MyNavLink></li><li><MyNavLink to="/home/message">Message</MyNavLink></li></ul><Switch><Route path="/home/news" component={News}></Route><Route path="/home/message" component={Message}></Route><Redirect to="/home/news"></Redirect></Switch></div></div>);}
}export default Home;MyNavLink.jsx
import React, {Component} from 'react';
import {NavLink} from "react-router-dom";class MyNavLink extends Component {render() {console.log(this.props)return (<div><NavLink activeClassName="atguigu" className="list-group-item" {...this.props}/></div>);}
}export default MyNavLink;Header.jsx
import React, {Component} from 'react';class Header extends Component {render() {// console.log('Header组件收到的props是', this.props)return (<div><div className="page-header"><h2>React Router Demo</h2></div></div>);}
}export default Header;About.jsx
import React, {Component} from 'react';class About extends Component {render() {// console.log('About组件收到的props是', this.props)return (<div><h3>我是About的内容</h3></div>);}
}export default About;index.js
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import {BrowserRouter, HashRouter} from "react-router-dom";const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<HashRouter><App/></HashRouter>
);项目结构：
运行结果：
13. 向路由组件传递params参数
1.params参数
- 路由链接(携带参数):<Link to='/demo/test/tom/18'}>详情</Link>
- 注册路由(声明接收):<Route path="/demo/test/:name/:age" component={Test}/>
- 接收参数: const {id,title} = this.props.match.params
Header.jsx
import React, {Component} from 'react';class Header extends Component {render() {// console.log('Header组件收到的props是', this.props)return (<div><div className="page-header"><h2>React Router Demo</h2></div></div>);}
}export default Header;MyNavLink.jsx
import React, {Component} from 'react';
import {NavLink} from "react-router-dom";class MyNavLink extends Component {render() {console.log(this.props)return (<div><NavLink activeClassName="atguigu" className="list-group-item" {...this.props}/></div>);}
}export default MyNavLink;About.jsx
import React, {Component} from 'react';class About extends Component {render() {// console.log('About组件收到的props是', this.props)return (<div><h3>我是About的内容</h3></div>);}
}export default About;Detail.jsx
import React, {Component} from 'react';const DetailData = [{id: '01', content: '你好,中国'},{id: '02', content: '你好,尚硅谷'},{id: '03', content: '你好,未来的自己'},
]class Detail extends Component {render() {// console.log(this.props)const {id, title} = this.props.match.paramsconst findResult = DetailData.find((detailObj) => {return detailObj.id === id})return (<ul><li>ID:{id}</li><li>TITLE:{title}</li><li>CONTENT:{findResult.content}</li></ul>);}
}export default Detail;Message.jsx
import React, {Component} from 'react';
import Detail from "./Detail/Detail";
import {Link, Route} from "react-router-dom";class Message extends Component {state = {messageArr: [{id: '01', title: '消息1'},{id: '02', title: '消息2'},{id: '03', title: '消息3'},]}render() {const {messageArr} = this.statereturn (<div><ul>{messageArr.map((msgObj) => {return (<li key={msgObj.id}><Link to={`/home/message/detail/${msgObj.id}/${msgObj.title}`}>{msgObj.title}</Link></li>)})}</ul><hr></hr><Route path="/home/message/detail/:id/:title" component={Detail}></Route></div>);}
}export default Message;News.jsx
import React, {Component} from 'react';class News extends Component {render() {return (<div><ul><li>news001</li><li>news002</li><li>news003</li></ul></div>);}
}export default News;Home.jsx
import React, {Component} from 'react';
import MyNavLink from "../../components/MyNavLink/MyNavLink";
import {Redirect, Route, Switch} from "react-router-dom";
import News from "./News/News";
import Message from "./Message/Message";class Home extends Component {render() {return (<div><h2>Home组件内容</h2><div><ul className="nav nav-tabs"><li><MyNavLink to="/home/news">News</MyNavLink></li><li><MyNavLink to="/home/message">Message</MyNavLink></li></ul><Switch><Route path="/home/news" component={News}></Route><Route path="/home/message" component={Message}></Route><Redirect to="/home/news"></Redirect></Switch></div></div>);}
}export default Home;App.js
import React, {Component} from 'react';
import {Redirect, Route, Switch} from "react-router-dom";
import About from "./pages/About/About";
import Home from "./pages/Home/Home";
import Header from "./components/Header/Header";
import MyNavLink from "./components/MyNavLink/MyNavLink";class App extends Component {render() {return (<div><div className="row"><div className="col-xs-offset-2 col-xs-8"><Header a={1}></Header></div></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group"><MyNavLink to="/about">About</MyNavLink><MyNavLink to="/home">Home</MyNavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body"><Switch><Route path="/about" component={About}></Route><Route path="/home" component={Home}></Route><Redirect to="/about"></Redirect></Switch></div></div></div></div></div>);}
}export default App;index.js
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import {BrowserRouter, HashRouter} from "react-router-dom";const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<HashRouter><App/></HashRouter>
);运行结果：
项目结构：
14.向路由组件传递search参数
2.search参数
- 路由链接(携带参数): <Link to=' /demo/test?name=tom&age=18'}>详情</Link>
- 注册路由(无需声明，正常注册即可): <Route path="/demo/test" component={Test}/>
- 接收参数: const isearch} = this.props.location
- 备注:获取到的search是urlencoded编码字符串，需要借助querystring解析
Message.jsx
import React, {Component} from 'react';
import Detail from "./Detail/Detail";
import {Link, Route} from "react-router-dom";class Message extends Component {state = {messageArr: [{id: '01', title: '消息1'},{id: '02', title: '消息2'},{id: '03', title: '消息3'},]}render() {const {messageArr} = this.statereturn (<div><ul>{messageArr.map((msgObj) => {return (<li key={msgObj.id}>{/*<Link to={`/home/message/detail/${msgObj.id}/${msgObj.title}`}>{msgObj.title}</Link>*/}<Link to={`/home/message/detail/?id=${msgObj.id}&title=${msgObj.title}`}>{msgObj.title}</Link></li>)})}</ul><hr></hr>{/*<Route path="/home/message/detail/:id/:title" component={Detail}></Route>*/}<Route path="/home/message/detail" component={Detail}></Route></div>);}
}export default Message;Detail.jsx
import React, {Component} from 'react';
import qs from "qs"const DetailData = [{id: '01', content: '你好,中国'},{id: '02', content: '你好,尚硅谷'},{id: '03', content: '你好,未来的自己'},
]class Detail extends Component {render() {console.log(this.props)// const {id, title} = this.props.match.paramsconst {search} = this.props.locationconst {id, title} = qs.parse(search.slice(1))const findResult = DetailData.find((detailObj) => {return detailObj.id === id})return (<ul><li>ID:{id}</li><li>TITLE:{title}</li><li>CONTENT:{findResult.content}</li></ul>);}
}export default Detail;运行结果：
项目结构：
15.向路由组件传递state参数
state参数：
- 路由链接(携带参数): <Link to={{path:' /demo/test',state:{name : ' tom' ,age:18]}}>详情</Link>注册路由(无需声明，正常注册即可):<Route path="/demo/test" component={Test}/>
- 接收参数: this.props.location.state
- 备注:刷新也可以保留住参数
Message.jsx
import React, {Component} from 'react';
import Detail from "./Detail/Detail";
import {Link, Route} from "react-router-dom";class Message extends Component {state = {messageArr: [{id: '01', title: '消息1'},{id: '02', title: '消息2'},{id: '03', title: '消息3'},]}render() {const {messageArr} = this.statereturn (<div><ul>{messageArr.map((msgObj) => {return (<li key={msgObj.id}>{/*<Link to={`/home/message/detail/${msgObj.id}/${msgObj.title}`}>{msgObj.title}</Link>*/}{/*<Link to={`/home/message/detail/?id=${msgObj.id}&title=${msgObj.title}`}>{msgObj.title}</Link>*/}<Link to={{pathname: '/home/message/detail',state: {id: msgObj.id, title: msgObj.title}}}>{msgObj.title}</Link></li>)})}</ul><hr></hr>{/*<Route path="/home/message/detail/:id/:title" component={Detail}></Route>*/}{/*<Route path="/home/message/detail" component={Detail}></Route>*/}<Route path="/home/message/detail" component={Detail}></Route></div>);}
}export default Message;Detail.jsx
import React, {Component} from 'react';
import qs from "qs"const DetailData = [{id: '01', content: '你好,中国'},{id: '02', content: '你好,尚硅谷'},{id: '03', content: '你好,未来的自己'},
]class Detail extends Component {render() {console.log(this.props)// const {id, title} = this.props.match.params// const {search} = this.props.location// const {id, title} = qs.parse(search.slice(1))const {id, title} = this.props.location.state || {}const findResult = DetailData.find((detailObj) => {return detailObj.id === id}) || {}return (<ul><li>ID:{id}</li><li>TITLE:{title}</li><li>CONTENT:{findResult.content}</li></ul>);}
}export default Detail;运行结果：
16.总结路由参数
17.push与repalce
Message.jsx
import React, {Component} from 'react';
import Detail from "./Detail/Detail";
import {Link, Route} from "react-router-dom";class Message extends Component {state = {messageArr: [{id: '01', title: '消息1'},{id: '02', title: '消息2'},{id: '03', title: '消息3'},]}render() {const {messageArr} = this.statereturn (<div><ul>{messageArr.map((msgObj) => {return (<li key={msgObj.id}>{/*<Link to={`/home/message/detail/${msgObj.id}/${msgObj.title}`}>{msgObj.title}</Link>*/}{/*<Link to={`/home/message/detail/?id=${msgObj.id}&title=${msgObj.title}`}>{msgObj.title}</Link>*/}<Link replace={true} to={{pathname: '/home/message/detail',state: {id: msgObj.id, title: msgObj.title}}}>{msgObj.title}</Link></li>)})}</ul><hr></hr>{/*<Route path="/home/message/detail/:id/:title" component={Detail}></Route>*/}{/*<Route path="/home/message/detail" component={Detail}></Route>*/}<Route path="/home/message/detail" component={Detail}></Route></div>);}
}export default Message;- push:留下记录
- repalce:不留记录
18.编程式路由导航
Message.jsx
import React, {Component} from 'react';
import Detail from "./Detail/Detail";
import {Link, Route} from "react-router-dom";class Message extends Component {state = {messageArr: [{id: '01', title: '消息1'},{id: '02', title: '消息2'},{id: '03', title: '消息3'},]}render() {const {messageArr} = this.statereturn (<div><ul>{messageArr.map((msgObj) => {return (<li key={msgObj.id}>{/*<Link to={`/home/message/detail/${msgObj.id}/${msgObj.title}`}>{msgObj.title}</Link>*/}{/*<Link to={`/home/message/detail/?id=${msgObj.id}&title=${msgObj.title}`}>{msgObj.title}</Link>*/}<Link replace={true} to={{pathname: '/home/message/detail',state: {id: msgObj.id, title: msgObj.title}}}>{msgObj.title}</Link></li>)})}</ul><hr></hr>{/*<Route path="/home/message/detail/:id/:title" component={Detail}></Route>*/}{/*<Route path="/home/message/detail" component={Detail}></Route>*/}<Route path="/home/message/detail" component={Detail}></Route></div>);}
}export default Message;Detail.jsx
import React, {Component} from 'react';
import qs from "qs"const DetailData = [{id: '01', content: '你好,中国'},{id: '02', content: '你好,尚硅谷'},{id: '03', content: '你好,未来的自己'},
]class Detail extends Component {render() {console.log(this.props)// const {id, title} = this.props.match.params// const {search} = this.props.location// const {id, title} = qs.parse(search.slice(1))const {id, title} = this.props.location.state || {}const findResult = DetailData.find((detailObj) => {return detailObj.id === id}) || {}return (<ul><li>ID:{id}</li><li>TITLE:{title}</li><li>CONTENT:{findResult.content}</li></ul>);}
}export default Detail;19.withRouter的作用
News.jsx
import React, {Component} from 'react';class News extends Component {componentDidMount() {setTimeout(() => {this.props.history.push('/home/message')}, 2000)}render() {return (<div><ul><li>news001</li><li>news002</li><li>news003</li></ul></div>);}
}export default News;- 借助this.prosp.history对象上的API对操作路由跳转、前进、后退
- this.prosp.history.push()
- this.prosp.history.replace()
- this.prosp.history.goBack()
- this.prosp.history.goForward()
- this.prosp.history.go()
- withRouter可以加工一般组件，让一般组件具备路由组件所特有的API
- withRouter的返回值是一个新组件
Header.jsx
import React, {Component} from 'react';
import {withRouter} from "react-router-dom";class Header extends Component {back = () => {this.props.history.goBack()}forward = () => {this.props.history.goForward()}go = () => {this.props.history.go(2)}render() {// console.log('Header组件收到的props是', this.props)return (<div><div className="page-header"><h2>React Router Demo</h2><button onClick={this.back}>回退</button><button onClick={this.forward}>前进</button><button onClick={this.go}>go</button></div></div>);}
}export default withRouter(Header);20.BrowserRouter与HashRouter
- 1.底层原理不一样:
- BrowserRouter使用的是H5的history API，不兼容IE9及以下版本。
- HashRouter使用的是URL的哈希值
- 2.path表现形式不一样
- BrowserRouter的路径中没有#,例如: localhost:3000/demo/test
- HashRouter的路径包含#,例如: localhost:3000/#/demo/test
- 3.刷新后对路由state参数的影响
- (1).BrowserRouter没有任何影响，因为state保存在history对象中。
- (2).HashRouter刷新后会导致路由state参数的丢失。
- 4.备注: HashRouter可以用于解决一些路径错误相关的问题。