访问阵列与Node.js的和猫鼬

Question

欲访问超过猫鼬的阵列和过滤过这样的阵列长度：

的MongoDB

{"likelist" : [ "5778173453f8f28a119d6eaa", "5778173453f8f28a119d6eab" ], "unlikelist" : [ "57781e7978ac42eb027d3728" ] } 

的Node.js

var likelistSum = req.body[0]['likelist'].length; 

Data.find({$and:[query,{"likelistSum":{$gt:0}}]}).limit(req.body.limit).lean().exec(function (err,data) { 
    console.log(data) 

}); 

我做错了什么？

Answer 1

尝试 req.body [0] .likelist.length;

也许你需要的结果解析为JSON，然后： JSON.parse（req.body [0]）likelist.length