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
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