nodejs mongodb 多字段排序

Useful chainable methods of cursor. These can optionally be options of find instead of method calls:

• .limit(n).skip(m) to control paging.
• .sort(fields) Order by the given fields. There are several equivalent syntaxes:
  • .sort({field1: -1, field2: 1}) descending by field1, then ascending by field2.
  • .sort([['field1', 'desc'], ['field2', 'asc']]) same as above
  • .sort([['field1', 'desc'], 'field2']) same as above
  • .sort('field1') ascending by field1

摘自https://github.com/mongodb/node-mongodb-native