myTest 里的数据：{id:1,name:‘a’},{id:2,name:‘b’},{id:3,name:‘c’}; 我想对idArr中的每一个id通过get查找返回list或者result，get方法里又是异步(或者get里面会更加复杂)，这么写只能查到id:3, 求教大神怎么解决

var mongodb = require('./db');
function asyncTest() {
    var idArr = [1, 2, 3];
    /*
     eventproxy
     */
    var Eventproxy = require('eventproxy');
    var ep = new Eventproxy();
    ep.after('find', idArr.length, function (list) {
        console.log('this is the final')
        console.log(list)
    });
    for (var i = 0; i < idArr.length; i++) {
        console.log('for loop'+i)
        get(idArr[i], function (err, results) {
            ep.emit('find', results);
            console.log('result'+results)
        });
    }

    /*
     async
     */
    var async = require('async');
    async.map(idArr,function(id,cb){
        get(id,function(err,results){
            if(err){

            }
            cb(null,results);
        })
    }),function(err,results){
        if(err){

        }
        console.log('result'+results);
    }
}
function get (req,cb){
    console.log(req+'find');
    mongodb.close();
    mongodb.open(function(err,db){
        if(err){
        }
        console.log(req+'find col');
        db.collection('myTest',function(err,collection){
            if(err){
                console.log(err)
            }
            collection.find({id:req}).toArray(function(err,doc){
                if(err){
                    console.log(err);
                }
                console.log(doc)
                cb(err,doc)
            })
        })
    })
}
asyncTest();