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Projection Operators投影运算符 Note
find() operations on views do not support the following projection operators:对视图的操作不支持以下投影 运算符：
Note
For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.有关特定运算符的详细信息，包括语法和示例，请单击特定运算符转到其参考页面。
Name名称 Description描述 $Projects the first element in an array that matches the query condition.投影数组中与查询条件匹配的第一个元素。 $elemMatchProjects the first element in an array that matches the specified $elemMatch投影数组中与指定的$elemMatch $metaProjects the available per-document metadata.投影可用的每个文档元数据。 $sliceLimits the number of elements projected from an array. 限制从数组投影的元素数。 Supports skip and limit slices.支持跳过和限制分片。