db.getCollection("robot_account_port_info").aggregate(
    [
        
        {
            //        查詢條件為端口信號存在的
            "$match": {
                "port_sign": 1
            }
        },
        {
            //把另一張表【account】與用本地的手機(jī)號進(jìn)行關(guān)聯(lián)
            "$lookup": 
            
            {
                "from": "account",
                "localField": "phone",
                "foreignField": "phone_num",
                "as": "inventory_docs"
            }
        },
        {
            //查處滿足條件的子文檔
            "$unwind": "$inventory_docs"
        },
        {
            //這兒是將子文檔展示出來，否則查處的結(jié)果滿足子文檔的其中之一，子文檔的值都會顯示出來
            "$match": {
                "inventory_docs.platform": "今日頭條"
            }
        },
        
    ]
)