我有一个集合，其中包含“名称”的索引。>db.search.getIndexes()[{"v":1,"key":{"_id":1},"name":"_id_"},{"v":1,"key":{"name":1},"name":"name_1"}]>我的一个疑问是>db.collection.find({name:{$regex:'^string'}}).explain()它使用索引{"cursor":"BtreeCursorname_1multi","isMultiKey":false,"n":25,"nscannedObjects":25,"nscanned":3247,"nscann