JS Send Ajax is an array of background loops to send JSON to the foreground method

Node backstage

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Router.post ("/cxhh", Function (req, res) {
Inquire
User.findone (Req.body, function (err, user) {

var hlist = []//new a new array
var j = 0;
var l=user.hh.length
for (var i = 0; i <user.hh.length ; i++) {The array length that the loop foreground sends over

User.findone ({
"_id": User.hh[i]
}, function (err, user) {

Hlist.push (user)//pushes the found data into the newly created array

J + +//push an array j+1
Console.log (User.hh.length)
if (j = = L) {Returns data to the foreground if the length of the pushed array is equal to the length of the group

Res.json ({
Data:hlist

})
}

})

}

})

})

JS Send Ajax is an array of background loops to send JSON to the foreground method