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## 1.正则查询 ~~~ const MongoClient = require('mongodb').MongoClient; var url = 'mongodb://localhost:27017/'; MongoClient.connect(url, { useNewUrlParser: true }, (err, client) => { if (err) throw err; var test = client.db('test'); test.collection('douban').find({address:/^l/}).toArray((err, result) => { if (err) throw err; console.log(result); client.close(); }) }) ~~~ ## 2.查询特定的属性 ~~~ const MongoClient = require('mongodb').MongoClient; var url = 'mongodb://localhost:27017/'; MongoClient.connect(url, { useNewUrlParser: true }, (err, client) => { if (err) throw err; var test = client.db('test'); test.collection('douban').find({age:30).toArray((err, result) => { if (err) throw err; console.log(result); client.close(); }) }) ~~~