的MongoDB - client.open（）返回「未定義的不是一個函數」

Question

這是我有：

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 
 
});

當我運行它，它指向的線開方法打開並且說「未定義不是函數」。我究竟做錯了什麼？

Answer 1

從mongo docs：

var MongoClient = require('mongodb').MongoClient 

// Connection URL 
var url = 'mongodb://localhost:27017/myproject'; 
// Use connect method to connect to the Server 
MongoClient.connect(url, function(err, db) { 
    console.log("Connected correctly to server"); 

    db.close(); 
});