类型错误：无法读取未定义的nodejs的属性“passport”

Question

我目前正在使用 Express、Node、Mongoose 和 Passport.js 开发一个注册和登录系统，注册机大部分工作正常，但登录系统存在一个大问题。由于某种原因，在我创建护照的方法中无法读取未定义的“护照”，因此某些内容会显示为未定义，但我似乎无法弄清楚。我不知道为什么它不起作用，请帮忙！！

这是我的代码 app.js

const express = require('express');
const path = require('path');
const bodyParser = require('body-parser');
const cors = require('cors');
const passport = require('passport');
const mongoose = require('mongoose');
const config = require('./config/database');

mongoose.connect(config.database);

mongoose.connection.on('connected', () => {
    console.log('Connected to database ' + config.database);
});

mongoose.connection.on('error', (err) => {
    console.log('Database error:' + err);
});


const app = express();
const users = require('./routes/users');
const port = 3000;

app.use(cors());
app.use(express.static(path.join(__dirname, 'public')));

app.use(bodyParser.json());

app.use(passport.initialize());
app.use(passport.session());

app.use('/users', users);

app.get('/', (req, res) => {
 res.send('Invalid Endpoint');
});

app.listen(port, () =>{
console.log('Server started on port' + port);
});

const express = require('express');
const path = require('path');
const bodyParser = require('body-parser');
const cors = require('cors');
const passport = require('passport');
const mongoose = require('mongoose');
const config = require('./config/database');

mongoose.connect(config.database);

mongoose.connection.on('connected', () => {
    console.log('Connected to database ' + config.database);
});

mongoose.connection.on('error', (err) => {
    console.log('Database error:' + err);
});


const app = express();
const users = require('./routes/users');
const port = 3000;

app.use(cors());
app.use(express.static(path.join(__dirname, 'public')));

app.use(bodyParser.json());

app.use(passport.initialize());
app.use(passport.session());

app.use('/users', users);

app.get('/', (req, res) => {
 res.send('Invalid Endpoint');
});

app.listen(port, () =>{
console.log('Server started on port' + port);
});

Answer 1

您的问题与护照会话有关。您需要先使用快速会话（请记住安装在您的依赖项中）才能正常工作。

你的 app.js 应该是这样的：

const express = require('express');
const path = require('path');
const bodyParser = require('body-parser');
const cors = require('cors');
const passport = require('passport');
const mongoose = require('mongoose');
const config = require('./config/database');
const session = require("express-session");

mongoose.connect(config.database);

mongoose.connection.on('connected', () => {
    console.log('Connected to database ' + config.database);
});

mongoose.connection.on('error', (err) => {
    console.log('Database error:' + err);
});


const app = express();
const users = require('./routes/users');
const port = 3000;

app.use(cors());
app.use(express.static(path.join(__dirname, 'public')));

app.use(bodyParser.json());

app.use(session({secret: "secret"});

app.use(passport.initialize());
app.use(passport.session());

app.use('/users', users);

app.get('/', (req, res) => {
    res.send('Invalid Endpoint');
});

app.listen(port, () =>{
    console.log('Server started on port' + port);
});

另外，请记住，Express 4.16.0 或更高版本已弃用主体解析器。它已重新添加到方法中express.json()，express.urlencoded()因此如果您的 Express 版本属于该类别，您可以将 app.js 更改为：

const express = require('express');
const path = require('path');
const cors = require('cors');
const passport = require('passport');
const mongoose = require('mongoose');
const config = require('./config/database');
const session = require("express-session");

mongoose.connect(config.database);

mongoose.connection.on('connected', () => {
    console.log('Connected to database ' + config.database);
});

mongoose.connection.on('error', (err) => {
    console.log('Database error:' + err);
});


const app = express();
const users = require('./routes/users');
const port = 3000;

app.use(cors());
app.use(express.static(path.join(__dirname, 'public')));

app.use(express.urlencoded({ extended: true }));
app.use(express.json());
app.use(session({secret: "secret"});

app.use(passport.initialize());
app.use(passport.session());

app.use('/users', users);

app.get('/', (req, res) => {
    res.send('Invalid Endpoint');
});

app.listen(port, () =>{
    console.log('Server started on port' + port);
});

我建议在您的代码中添加注释以保持代码整洁。