无废话快速上手React路由开发
编程学习 2021-07-04 14:07www.dzhlxh.cn编程入门
本文以简洁为目标,帮助快速上手react-router-dom默认你接触过路由相关的开发,通过实例代码讲解的很详细,对React路由相关知识感兴趣的朋友一起看看吧
安装
输入以下命令进行安装:
// npm npm install react-router-dom // yarn yarn add react-router-dom
react-router相关标签
react-router
常用的组件有以下八个:
import { BrowserRouter, HashRouter, Route, Redirect, Switch, Link, NavLink, withRouter, } from 'react-router-dom'
简单路由跳转
实现一个简单的一级路由跳转
import { BrowserRouter as Router, Route, Link } from 'react-router-dom' import Home from './home' import About from './about' function App() { return ( <div className="App"> <Router> <Link to="/home" className="link">跳转Home页面</Link> <Link to="/about" className="link">跳转About页面</Link> <Route path="/home" component={Home}/> <Route path="/about" component={About}/> </Router> </div> ); } export default App;
效果如下:
要点总结:
Route
组件必须在Router
组件内部Link
组件的to
属性的值为点击后跳转的路径Route
组建的path
属性是与Link
标签的to
属性匹配的;component
属性表示Route
组件匹配成功后渲染的组件对象
嵌套路由跳转
React
的路由匹配层级是有顺序的
例如,在 App
组件中,设置了两个路由组件的匹配路径,分别是 /home
和 /about
,代码如下:
import { BrowserRouter as Router, Route, Link, } from 'react-router-dom' import Home from './home' import About from './about' function App() { return ( <div className="App"> <Router> <Link to="/home">跳转Home页面</Link> <Link to="/about">跳转About页面</Link> <Route path="/home" component={Home}/> <Route path="/about" component={About}/> </Router> </div> ); } export default App;
然后 Home
组件中同样也想设置两个路由组件的匹配路径,分别是 /home/one
和 /home/two
,此时就可以看出,这个 /home/one
和 /home/two
为上一级路由 /home
的二级嵌套路由,代码如下:
import React from 'react' import { Route, Link, } from 'react-router-dom' import One from './one' import Two from './two' function Home () { return ( <> 我是Home页面 <Link to="/home/one">跳转到Home/one页面</Link> <Link to="/home/two">跳转到Home/two页面</Link> <Route path="/home/one" component={One}/> <Route path="/home/two" component={Two}/> </> ) } export default Home
特别注意: Home
组件中的路由组件 One
的二级路由路径匹配必须要写 /home/one
,而不是 /one
,不要以为 One
组件看似在 Home
组件内就可以简写成 /one
动态链接
NavLink
可以将当前处于active
状态的链接附加一个active
类名,例如:
import { BrowserRouter as Router, Route, NavLink } from 'react-router-dom' import Home from './home' import About from './about' function App() { return ( <div className="App"> <Router> <NavLink to="/home" className="link">跳转Home页面</NavLink> <NavLink to="/about" className="link">跳转About页面</NavLink> <Route path="/home" component={Home}/> <Route path="/about" component={About}/> </Router> </div> ); } export default App; /* 设置active类的样式 */ .active { font-weight: blod; color: red; }
效果如下:
路由匹配优化
当点击跳转链接时,会自动去尝试匹配所有的Route
对应的路径,如图所示:
正常情况下,只需匹配到一个规则,渲染即可,即匹配成功一个后,无需进行后续的匹配尝试,此时可以用Switch
组件,如下所示:
import { BrowserRouter as Router, Route, NavLink, Switch, } from 'react-router-dom' import Home from './home' import About from './about' function App() { return ( <div className="App"> <Router> <NavLink to="/home" className="link">跳转Home页面</NavLink> <NavLink to="/about" className="link">跳转About页面</NavLink> <Switch> <Route path="/home" component={Home}/> <Route path="/about" component={About}/> <Route path="/home" component={Home}/> <Route path="/home" component={Home}/> {/* 此处省略一万个Route组件 *