我如何让我的快递服务器从我的React客户端应用程序获取请求？

Question

我正在开发我的第一个Express后端React前端应用程序。 当前正在用户注册/登录/注销部分。

 const express = require('express'); const mongoose = require('mongoose'); const bodyParser = require('body-parser'); const keys = require('./config/keys') const passport = require('passport'); const session = require('express-session'); const LocalStrategy = require('passport-local'); // const passportLocalMongoose = require('passport-local-mongoose'); const User = require('./models/User'); const app = express(); // Use BodyParser app.use(bodyParser.urlencoded({ extended: true })); // Passport app.use(passport.initialize()); app.use(passport.session()); app.use(session({ secret: 'Rusty is the best', saveUninitialized: false, resave: false })); passport.use(new LocalStrategy(User.authenticate())); passport.serializeUser(User.serializeUser()); passport.deserializeUser(User.deserializeUser()); // Connect to the Database const db = keys.mongoURI mongoose .connect(db, { useNewUrlParser: true }) .then(() => console.log(`MongoDB connected...`)) .catch(err => console.log(err)); // Routes const items = require('./routes/api/items') app.use('/api/items', items); // Auth Routes app.post('/register', function(req, res) { User.register(new User({ username: req.body.username }), req.body.password, function(err, user) { if (err) { console.log(err); return res.render('/register'); } passport.authenticate('local')(req, res, function() { res.redirect('/secret'); }) }) }); app.post('/login', passport.authenticate('local', { successRedirect: '/secret', failureRedirect: '/login' }), function(req, res) { }); app.get('/logout', function(req, res) { req.logout(); res.redirect('/'); }) // Port and Listen const port = process.env.PORT || 5000; app.listen(port, () => console.log(`Server started on ${port}...`)); 

我的express server.js文件末尾的发布路线可以正常工作，但是当我进入app.get（'/ logout'）时遇到问题。 我的服务器在5000上运行，客户端在3000上运行。我的客户端project.json中有“ proxy”：“ http：// localhost：5000 ”。 localhost：3000 / logout返回一个空白页，而localhost：5000 / logout返回res.send消息“您已点击退出页面”。

有人知道我该如何解决吗？

编辑：这是我的反应路由器，以显示客户端如何路由

 import React, { Component } from 'react'; import { Route, BrowserRouter } from 'react-router-dom'; import Input from './components/Input'; import SignUp from './components/SignUp'; import Form from './components/Form'; import LogIn from './components/LogIn'; import SignUp2 from './components/SignUp2'; import Profile from './components/Profile'; import Home from './components/Home'; import LogOut from './components/LogOut'; class App extends Component { render() { return ( <BrowserRouter> <div> <Route exact path='/' component={ Home } /> <Route path='/register' component={ SignUp2 } /> <Route path='/changeThisBackToRegister' component={ SignUp } /> <Route path='/form' component={ Form } /> <Route path='/login' component= { LogIn } /> <Route path='/profile' component = { Profile } /> <Route path='/secret' component = { Input } /> <Route path='/logout' component = { LogOut } /> </div> </BrowserRouter> ); } } export default App; 

Answer 1

更改/logout api响应以发送json响应。

app.get('/logout', function(req, res) {
  req.logout();
  res.json({success: true});
})

在Logout组件中，在挂载组件时进行/logout调用。

import React, { Component } from 'react';

export default class Logout extends Component {
  constructor(props) {
    super(props);
    this.state = {
      logoutSuccess: false
    };

  }
  componentDidMount() {
    fetch('/logout')
    .then((response) => response.json())
    .then(() => {
      this.setState({logoutSuccess: true});
    });
  }
  render() {
    const { logoutSuccess } = this.state;
    return (
      <div>
        { logoutSuccess && (<div>Logout Success</div>)}
      </div>
    );
  }
}