June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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176
｜
第
16
章
16.4.2
路由
第
14
章中学习的路由的核心概念现在并没有改变。我们仍旧使用
URL
路径来决定用户看
到的是哪部分的界面。有所不同的是，在这里路由由客户端应用来处理。客户端应用现在
负责基于路由来改变
UI
。如果页面导航要求来自服务器的新数据或数据更新
，那么就由客
户端应用来向服务器发出请求。
React
应用的路由有非常多的选择
，每个人的偏好也不同。不过，有一个路由库是统治性
的：
React
Router
。对于
React Router
，我不喜欢的地方不少，但它太常用了，你一定会碰
到它的。而且，要想快速运行一个简单的东西，它是个不错的选择。基于这两个原因，这
里选择使用
React Router
。
先安装
DOM
版本的
React Router
（还有一个适合移动开发的
React Native
版本）
：
yarn add react-router-dom
现在把路由连接起来，并增加“关于”页和“页面未找到”页，然后给网站
logo
加上链
接，让它链接到主页：
import React from 'react'
import {
BrowserRouter as Router,
Switch,
Route,
Link
} from 'react-router-dom'
import logo from './img/logo.png'
import './App.css'
function Home() {
return (
<div>
<h2>Welcome to Meadowlark ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.