節點js服務器不會啓動顯示錯誤

Question

我想做一個節點js服務器但它不工作。它說，下面的錯誤每次我做CRUD操作與貓鼬節點js和表達依賴條件
錯誤運行的命令節server.js C服務器同時：\用戶\拉希爾\桌面\ codenode \ node_modules \路徑TO- regexp \ index.js：34 .concat（strict？''：'/？'） ^ TypeError：path.concat不是函數 at pathtoRegexp（C：\ Users \ Rahil \ Desktop \ codenode \ node_modules \ path （C：\ Users \ Rahil \ Desktop \ codenode \ node_modules \ express \ lib \ route r \ layer.js：21：17） at-regexp \ index.js：34：6） at Function.proto.route（C：\ Users \ Rahil \ Desktop \ codenode \ node_modules \ expres s \ lib \ router \ index.js：364：15） at Fun ction.app（匿名函數）爲put]。（C：\用戶\拉希爾\桌面\ codeno 德\ node_modules \表達\ lib中\的application.js：405：30） 在對象。 （C：\用戶\拉希爾\桌面\ codenode \ server.js：86：9） 在Module._compile（module.js：409：26） 在Object.Module._extensions..js（module.js：416 （module.js：443：32） at Function.Module._load（module.js：300：12） at Function.Module.runMain（module.js：441：10）

---------- 
Code Server.js 
    // BASE SETUP 
    // 
=================================================================== 

// call the packages we need 
var express = require('express');  // call express 
var app  = express();     // define our app using express 
var bodyParser = require('body-parser'); 

var mongoose = require('mongoose'); 
mongoose.connect('mongodb://127.0.0.1:27017/company'); // connect to our databas 


var Company  = require('./app/models/companies'); 

// configure app to use bodyParser() 
// this will let us get the data from a POST 
app.use(bodyParser.urlencoded({ extended: true })); 
app.use(bodyParser.json()); 

var port = process.env.PORT || 8080;  // set our port 

// ROUTES FOR OUR API 
// ============================================================================= 
var router = express.Router();    // get an instance of the express Router 
// middleware to use for all requests 
router.use(function(req, res, next) { 
    // do logging 
    console.log('Something is happening.'); 
    next(); // make sure we go to the next routes and don't stop here 
}); 
// test route to make sure everything is working (accessed at GET http://localhost:8080/company) 

router.get('/', function(req, res) { 
    res.json({ message: 'hooray! welcome !' }); 
}); 

// more routes for our company will happen here 
// on routes that end in /company 
// ---------------------------------------------------- 
router.route('/addcompany') 

// create a company (accessed at POST http://localhost:8080/company/addcompany) 
.post(function(req, res) { 

    var company = new Company();  // create a new instance of the Company model 
    company.company_name = req.body.company_name; 
    company.reg_no = req.body.reg_no; 
    company.address = req.body.address; 
    company.contact_name = req.body.contact_name; 
    company.phone_no = req.body.phone_no; 
    // set the addcompany name (comes from the request) 

    // save the company and check for errors 
    company.save(function(err) { 
     if (err) 
      res.send(err); 

     res.json({ message: 'Company created!' }); 
    }); 

}); 
app.get('/addcompany', function(req, res) { 
    Company.find(function(err, companies) { 
     if (err) 
      res.send(err); 

     res.json(companies); 
    }); 
}); 

router.route('/:company_id') 

// get the company with that id (accessed at GET http://localhost:8080/company/addcompany/:company_id) 
.get(function(req, res) { 
    Company.findById(req.params.company_id, function(err, company) { 
     if (err) 
      res.send(err); 
     res.json(company); 
    }); 
}); 




// update the company with this id (accessed at PUT http://localhost:8080/company/addcompany/:company_id) 
app.put(function(req, res) { 

    // use our company model to find the company we want 
    Company.findById(req.params.company_id, function(err, company) { 

     if (err) 
      res.send(err); 

     company.company_name = req.body.company_name; 
     company.reg_no = req.body.reg_no; 
     company.address = req.body.address; 
     company.contact_name = req.body.contact_name; 
     company.phone_no = req.body.phone_no; // update the company info 

     // save the company 
     company.save(function(err) { 
      if (err) 
       res.send(err); 

      res.json({ message: 'Company updated!' }); 
     }); 

    }); 
}); 

// delete the company with this id (accessed at DELETE http://localhost:8080/company/addcompany/:company_id) 
app.delete(function(req, res) { 
    Company.remove({ 
     _id: req.params.company_id 
    }, function(err, company) { 
     if (err) 
      res.send(err); 

     res.json({ message: 'Successfully deleted' }); 
    }); 
}); 
// REGISTER OUR ROUTES ------------------------------- 
// all of our routes will be prefixed with /company 


app.use('/company', router); 

// START THE SERVER 
// ============================================================================= 
app.listen(port); 
console.log('Magic happens on port ' + port); 



END OF SERVER.JS 

---------- 
var mongoose  = require('mongoose'); 
var Schema  = mongoose.Schema; 

var CompanySchema = new Schema({ 
    company_name: String, 
    reg_no: String, 
    address: String, 
    contact_name: String, 
    phone_no: String 
}); 

module.exports = mongoose.model('Companies', CompanySchema); 
END OF COMPANIES.JS 
---------- 
package.json 
{ 
    "name": "node-api", 
    "main": "server.js", 
    "dependencies": { 
    "body-parser": "~1.0.1", 
    "express": "~4.0.0", 
    "mongoose": "~3.6.13" 
    } 
} 




PLEASE FIND THE SOLUTION >>>>> THANKING YOU 


Here is index,js file 
    /** 
     * Expose `pathtoRegexp`. 
     */ 

    module.exports = pathtoRegexp; 

    /** 
    * Normalize the given path string, 
    * returning a regular expression. 
    * 
    * An empty array should be passed, 
    * which will contain the placeholder 
    * key names. For example "/user/:id" will 
    * then contain ["id"]. 
    * 
    * @param {String|RegExp|Array} path 
    * @param {Array} keys 
    * @param {Object} options 
    * @return {RegExp} 
    * @api private 
    */ 

    function pathtoRegexp(path, keys, options) { 
    options = options || {}; 
    var sensitive = options.sensitive; 
    var strict = options.strict; 
    var end = options.end !== false; 
    keys = keys || []; 

    if (path instanceof RegExp) return path; 
    if (path instanceof Array) path = '(' + path.join('|') + ')'; 

    path = path 
    .concat(strict ? '' : '/?') 
    .replace(/\/\(/g, '/(?:') 
    .replace(/([\/\.])/g, '\\$1') 
    .replace(/(\\\/)?(\\\.)?:(\w+)(\(.*?\))?(\*)?(\?)?/g, function (match, slash, format, key, capture, star, optional) { 
     slash = slash || ''; 
     format = format || ''; 
     capture = capture || '([^/' + format + ']+?)'; 
     optional = optional || ''; 

     keys.push({ name: key, optional: !!optional }); 

     return '' 
     + (optional ? '' : slash) 
     + '(?:' 
     + format + (optional ? slash : '') + capture 
     + (star ? '((?:[\\/' + format + '].+?)?)' : '') 
     + ')' 
     + optional; 
    }) 
    .replace(/\*/g, '(.*)'); 

    return new RegExp('^' + path + (end ? '$' : '(?=\/|$)'), sensitive ? '' : 'i'); 
    }; 

Answer 1

有一個在你的代碼兩個錯誤：

app.put(function(req, res) { 
    /*...*/ 
} 

應該是：

router.put(function(req, res) { 
    /*.....*/ 
}) 

這同樣適用於app.delete。
我認爲你應該尋找一個更好的教程。