直接上代码：

    const ones = await InspectTaskUser.aggregate([{$facet: {paginatedResult: [{ $match: { user_id: ObjectId(_id) } },{ $skip: (page - 1) * size },{ $limit: size },{$lookup: {from: 'inspecttasks',localField: 'task_id',foreignField: '_id',as: 'task'}},{ $unwind: "$task" },],totalCount: [{ $match: { user_id: ObjectId(_id) } },{ $count: 'totalCount' }]}}]);