mongoose報錯：
(node:9716)DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead
解決方法：
//鏈接數據庫
mongoose.set('useCreateIndex', true) //加上這個
mongoose.connect(db, { useNewUrlParser: true })
mongoose報錯：DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead
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