狼叔2-P216页：mongoose示例代码报错

const mongoose = require('mongoose'); let uri = 'mongodb://:27017/' let config = { useNewUrlParser: true, useUnifiedTopology: true, user:'', pass: '***', authSource: 'admin', dbName :'db_helloword' } let db = mongoose.connect(uri, config);

db.connection.on('error', function(err){ console.log('数据库连接失败',err) }); db.connection.once('open', () => {

console.log('成功连接')

})

i5ting / langshu

狼叔2-P216页：mongoose示例代码报错 #7