let pipeline = [{
$lookup: {
from: "user_person",
localField: "cardnumber",
foreignField: "cardnumber",
as: "right_person"
}
},

{"$unwind":"$right_person"},//查處滿足條件的子文檔
{
$match: {//這兒是將子文檔展示出來，否則查處的結果滿足子文檔的其中之一，子文檔的值都會顯示出來
"right_person.state":1
}
},
{
$match: {
$or: [{
"IDcard": userIDCard
},
{
"right_person.ownerIDCard": userIDCard
},
{
"right_person.userIDCard": userIDCard
}
]
}
},

// {
// $project:{"inventory_docs.Knowledge_QuestionType":1,"inventory_docs.Knowledge_QuestionDetail":1,"_id":0,"Cat_Name":1} //獲取想要的字段
// }

]

mongodb子查詢