mongoose报错:(node:15689) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
解决办法：
//连接数据库
mongoose.set('useCreateIndex', true) //加上这个
mongoose.connect(db, { useNewUrlParser: true })
mongoose报错:DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
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