node.js - Express.js 应用程序错误 : the browser is stuck in loading state when trying to access certain route

Question

我正在开发 blogging application (单击链接查看 GitHub 存储库) Express , EJS和 MongoDB。

出于某种原因，我一直无法识别，当我尝试访问:http://localhost:3000/dashboard时，它(浏览器)陷入加载状态，并且从未真正加载仪表板路线。

在“entry”index.js 文件中，我有:

const express = require('express');
const dotenv = require('dotenv');
const mongoose = require('mongoose');
const path = require('path');
const morgan = require('morgan');
const expressLayouts = require('express-ejs-layouts');
const app = express();

dotenv.config();

//Conect to MONGODB
mongoose.connect(process.env.MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true })
.then(() => {
    console.log('conected');
});

mongoose.connection.on('error', err => {
    console.log(`DB connection error: ${err.message}`);
});

// Set static directory
app.use(express.static(path.join(__dirname, 'public')));

// Set views directory
app.set('views', path.join(__dirname, 'views'));

// Set view engine
app.set('view engine', 'ejs');

// Use Express Layouts
app.use(expressLayouts);

// Middleware
app.use(morgan('dev'));

// Bring the Posts Routes
const postsRoute = require('./routes/front-end/posts');

// Get Posts
app.use('/', postsRoute);

// Get Single Post
app.use('/:id', postsRoute);

// Bring the Dashboard
const dashboardRoute = require('./routes/admin/dashboard');

// Get Dashboard
app.use('/dashboard', dashboardRoute);

const port = process.env.PORT || 3000;

app.listen(port, () => console.log(`Listening on port ${port}!`));

在仪表板路线(routes\admin\dashboard.js)中，我有:

const express = require('express');
const dashboardController = require('../../controllers/admin/dashboard');

// Express router
const router = express.Router();

// Dysplay Dashboard
router.get('/dashboard', dashboardController.displayDashboard);

module.exports = router;

在仪表板 Controller 中时:

const Post = require('../../models/post');

exports.displayDashboard = (req, res, next) => {
    res.send('Dashboard');
};

在routes/front-end/posts.js中我有:

const express = require('express');
const postsController = require('../../controllers/front-end/posts');

// Express router
const router = express.Router();

// Get Posts
router.get('/', postsController.getPosts);

// Get Single Post
router.get('/:id', postsController.getSinglePost);

module.exports = router;

帖子 Controller :

const Post = require('../../models/post');

exports.getPosts = (req, res, next) => {
    const posts = Post.find({}, (err, posts) => {
        if(err){
            console.log('Error: ', err);
        } else {
            res.render('default/index', {
                layout: 'default/layout',
                website_name: 'MEAN Blog',
                page_heading: 'XPress News',
                page_subheading: 'A MEAN Stack Blogging Application',
                posts: posts
            });
        }
    });
};

exports.getSinglePost = (req, res, next) => {
    let id = req.params.id;
    if (id.match(/^[0-9a-fA-F]{24}$/)) {
        Post.findById(id, function(err, post){
            if(err){
                console.log('Error: ', err);
            } else {
                res.render('default/singlepost', {
                    layout: 'default/layout',
                    website_name: 'MEAN Blog',
                    post: post
                });
            }
        });
    }
};

IMPORTANT: It is necessary that every single post is displayed under the root url, for example: http://localhost:3000/5e3063dbfa749d9229bab26f where 5e3063dbfa749d9229bab26f is, of course the post id.

这是出于搜索引擎优化 (SEO) 目的。我打算稍后用帖子 slug 替换 id:http://localhost:3000/my-great-post。

我怎样才能实现这个目标？

Answer 1

已修复，用于完整运行示例克隆 node-cheat XPressBlog并运行 node index，然后运行 ​​npm i。

将浏览器指向 http://localhost:3000/dashboard ，输出:

This is Dashboard

http://localhost:3000 ，输出:

This will load all posts; continue with your logic!

http://localhost:3000/my-great-post ，输出:

This will load single post with slug : my-great-post

你做错了什么？

您对 app.use( 的使用感到困惑，因此根据您的需要(如您的帖子中所述)修复了这些问题，如下所示:

const dashboardRoute = require("./routes/admin/dashboard");
app.use('/dashboard', dashboardRoute);

const postsRoute = require('./routes/front-end/posts');
app.use('/', postsRoute);

如果您想了解有关 app.use 的更多信息，请点击以下链接:

• nodejs-express-what-is-app-use
• using-middleware