DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html

DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html

这错误我找了好久，WTF，怎么数据库就是不运行啊。
一翻墙，可找到了。
以后有问题赶紧翻墙。

var mongoose = require('mongoose')
var mongodb = 'mongodb://localhost/root/data/db'
//重点在这一句，赋值一个全局Promise
mongoose.Promise = global.Promise
var db = mongoose.connect(mongodb);

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