javascript - MongoDB -- client.open() returns "undefined in not a function" -

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here's have:

var express = require('express');  var mongoclient = require('mongodb').mongoclient;  var server = require('mongodb').server;    var app = express();    var client = new mongoclient(new server('localhost', 27017, {}), {});    client.open(function(err, client){  //callback  });

and when run it, points line open method on , says "undefined not function". doing wrong?

from mongo docs : 

var mongoclient = require('mongodb').mongoclient  // connection url var url = 'mongodb://localhost:27017/myproject'; // use connect method connect server mongoclient.connect(url, function(err, db) {   console.log("connected correctly server");    db.close(); });

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