如何在React中链接两个单独的页面

Question

我在一个名为components的文件夹中有两个页面"注册"one_answers"登录"，我正在尝试使用<Link>将注册页面与登录页面链接起来。但它给出了一些错误。

组件/SignUp.js

<div className = 'spacing'>Already have an account?&nbsp;<span className = 'highlight'><Link to = {'/SignIn'}>Sign In</Link></span></div>

组件/SignIn.js

import React, { Component } from 'react'
import './SignInStyleSheet.css'
class SignIn extends Component {
render() {
return (
<React.Fragment>
{/* for pop-up  success */}
<div class = "pop-up-success">
<h3> Login Successful.</h3>
</div>
{/* for pop-up  error */}
<div class = "pop-up-error">
<h3> Incorrect Username/ Password.</h3>
</div>
<div class = 'container'>
{/* for form box */}
<div class =' window'>
<div class = 'bold-line'></div>
<div class = 'overlay'></div>
<div class = 'content'>
<div class = 'welcome'>Welcome Again!</div>
<div class = 'subtitle'>Thank you to step forwaerd to save water.</div>
<form class = "input-fields">
<input type = 'email' placeholder = 'Email' class = 'input-line full-width' value = "" name = "useremail" id = "email" required></input>
<input type = 'text' placeholder = 'Street' class = 'input-line full-width' required></input>
<input type = 'text' placeholder = 'City' class = 'input-line full-width' required></input>
<select id = "select_opt" class = 'input-line full-width' required></select>
<input type = 'password' placeholder = 'Password' class = 'input-line full-width' value = "" name = "userpasswd" id = "password" required></input>
</form>
<div class = 'spacing'>Forgot Password?&nbsp;<span class = 'highlight'><a href = "#">Click Here</a></span></div>
<div><button id = 'loginBtn' class = 'ghost-round full-width' type = "button">Log In</button></div>
<div class = 'spacing'>New User?&nbsp;<span class = 'highlight'><a href = "sign-up.html">Sign Up</a></span></div>
</div>
</div>
</div>   
</React.Fragment>
)
}
}
export default SignIn

错误：

错误：不变量失败：您不应该在之外使用

Answer 1

使用以下命令安装react路由器dom

npm install --save react-router-dom

在项目目录中创建一个新文件(MainRouter(

import { BrowserRouter, Route, Link } from "react-router-dom"; //import the package
import SignIn from "../SignIn" //import your signIn page
import SignUp from "../SignUp" //import your signUp page
function MainRouter(){
return(
<BrowserRouter>
<div className="container">
<Switch>
<Route path="/signIn" component={SignIn} />
<Route path="/signUp" component={SignUP} />
</Switch>
</div>
</BrowserRouter>
)
}
export default MainRouter

为什么需要这个

react router dom包允许您在浏览器(客户端(中动态导航页面，而无需刷新页面，这是在单页应用程序中处理导航的好方法

Answer 2

管理react应用程序页面之间导航的最佳方法是使用react路由器-路由器管理应用程序中可用的路由(即链接到应用程序中页面的URL(。

请看一下React Router的介绍：https://www.freecodecamp.org/news/react-router-in-5-minutes/

或者另一个好的介绍：https://www.newline.co/@andreamaco/如何使用react路由器链接处理应用程序中的导航--088f82d3