MongooseError:Operation`articles.insertOne（）` 10000毫秒后缓冲超时，Node.js，Mongoose

我一直在学习一个关于使用Mongoose（）制作降价博客的教程

以下是导致该区域的代码部分：

const Article = require('./../models/article')
const router = express.Router()

router.get('/new', (req, res) => {
    res.render('articles/new', {article : new Article()})
})

router.get('/:id', (req, res) => {
    res.send(req.params.id)
})

router.post('/', async (req, res) => {
    let article = new Article({
        title: req.body.title,
        markdown: req.body.markdown
    })

    try{
    article = await article.save()
    res.redirect(`/articles/${article.id}`)
    } catch (e) {
        console.log(e)
        res.render('articles/new', {article: article})
    }
})

module.exports = router

当我运行此操作时，我会得到以下错误：

MongooseError: Operation `articles.insertOne()` buffering timed out after 10000ms
    at Timeout.<anonymous> (C:\Users\USER\Documents\Folder\Folder\Website\node_modules\mongoose\lib\drivers\node-mongodb-native\collection.js:185:20)
    at listOnTimeout (internal/timers.js:549:17)
    at processTimers (internal/timers.js:492:7)

---

我想你需要向我们展示你的文章代码。我已经编辑了这篇文章，并在底部添加了这一部分只是为了确保，你已经有了连接数据库的代码吗？是的，我有连接数据库的代码，mongoose.connect（）mongodb://localhost/news“，{useNewUrlParser:true，useUnifiedTopology:true}）

const mongoose = require('mongoose')

const articleSchema = new mongoose.Schema({
    title: {
        type: String,
        required: true
    },
    markdown: {
        type: String,
        required: true
    },
    createdAt: {
        type: Date,
        default: Date.now
    }
})

module.exports = mongoose.model('Article', articleSchema)