无法读取node_modules中未定义的属性“push”

Question

在运行我的第一个MEAN stack应用程序时,我遇到了以下错误：

\contactlist\node_modules\express\lib\router\index.js:502 this.stack.push（层）；^

TypeError：无法在function.proto读取未定义的属性“push”(C:\users\mahima kaushik\desktop\contactlist\node_modules\express\lib\router\index.js:502:14)。[as post](C:\users\Mahima Kaushik\Desktop\ContactList\node_modules\Express\lib\router\index.js:509:22)。(C:\users\Mahima Kaushik\Desktop\ContactList\routes\route.js:11:8)在module._compile（内部/module/cjs/loader.js:1251:30)在object.module._extensions.js（内部/module/cjs/loader.js:1272:10)在module.load（内部/module/cjs/loader.js:1100:32)在function.module.load（内部/module/cjs/loader.js:962:14)在(C:\users\Mahima Kaushik\Desktop\ContactList\app.js:9:15)在module._compile(internal/module/cjs/loader.js:1251:30)在object.module._extensions.js(internal/module/cjs/loader.js:1272:10)在module.load(internal/module/cjs/loader.js:1100:32)在function.module.load(internal/module/cjs/loader.js:962:14)在

联系人列表/app.js

var express = require('express');
var mongoos = require('mongoose');
var bodyparser  = require('body-parser');
var cors = require('cors');
var path = require('path');

var app = express();
const route = require('./routes/route');

//connect to mongodb
mongoos.Mongoose.connect('mongodb://localhost:27017/contactlist');

//on connection
Mongoose.connection.on('connected',()=>{
    console.log('connected to database mongodb @2717');
});
Mongoose.connection.on('error',(err)=>{
    if(err)
    {
        console.log('error in database connection:'+err);
    }
});


//port number
const port = 3000
//adding middleware -cors
app.use(cors());

//boday-parser
app.use(bodyparser.json());

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

//add routes
app.use('/api',route);
//testing
app.get('/',(req,res)=>{
    res.send('contactlist');
});

app.listen(port,()=>{
    console.log('server started at port:'+port);

});

ContactList/routes/route.js

const { Router } = require('express');
const express = require("express");
const router = express.Router();
//retrieving contacts
router.get('/contacts',(req,res,next) =>{
    res.send('retrieving the contact list');

});

//add contacts
Router.post('/contact',(req , res, next)=>{
//logic
});

//delete contacts
Router.delete('/contact/:id',(req , res, next)=>{
//logic
});

module.exports = router;

Answer 1

您没有正确创建路由。.get、.post和.delete是Router实例的实例方法，而不是静态方法。有关更多信息，请参见路由

routes/route.js应为：

const { Router } = require('express');
const router = Router();
//retrieving contacts
router.get('/contacts', (req, res, next) => {
  res.send('retrieving the contact list');
});

//add contacts
router.post('/contact', (req, res, next) => {
  //logic
});

//delete contacts
router.delete('/contact/:id', (req, res, next) => {
  //logic
});

module.exports = router;