db.collection.ensureIndex()

db.collection.ensureIndex(keys, options)
Note注意
Removed in 5.0在5.0中删除

db.collection.ensureIndex() has been replaced by db.collection.createIndex().已被db.collection.createIndex()替换。

Tip提示
See also: 参阅：

db.collection.createIndex()

←  db.collection.dropIndexes()db.collection.estimatedDocumentCount() →