var settings = require('../settings'),
Db = require('mongodb').Db,
Connection = require('mongodb').Connection,
Server = require('mongodb').Server;
module.exports = new Db(settings.db, new Server(settings.host, settings.port), {safe: true});我在这段代码中有几个不懂点。。Db = require('mongodb').Db和Connection = require('mongodb').Connection和Server = require('mongodb').Server和new Db(settings.db, new Server(settings.host, settings.port), {safe: true})它们的作用是干什么的???求助。麻烦知道的给解答下。谢谢!
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