我应该使用哪种类型的变量？

Question

我的nodejs应用程序中有一个功能。我想从循环中获取一个值。所以我在循环之前实例化一个变量，并从循环中检查值。一旦获得值，我就将其设置为在循环之前声明的变量，问题出在我退出循环后，我的变量将是其原始值，即我在循环中赋予的值

router.get('/gettext', function (req, res) {

  var current = "You Finised All";
  var times = 0;
  MongoClient.connect(url, function (err, db) {
    if (err) throw err;
    var dbo = db.db("nodekb");
    dbo.collection("texts").find().toArray(function (err, result) {
      if (err) throw err;
      //console.log("Result is \n" + result);
      for (let value of result) {
        if (!(value.readBy.includes(req.user._id.toString()))) {
          console.log("userId is: " + req.user._id);
          //Check if the user and text exist in Repeat collection parseInt(value.no, 10)
          dbo.collection("repeat").find({ uid: req.user._id.toString(), textNo: parseInt(value.no, 10) }).toArray(function (err, doc) //find if a value exists
          {
            console.log("Doc is:");
            console.log(doc);
            if (doc.length > 0) //if it does
            {
              console.log("This User exists in this metin. UserId: " + req.user._id.toString() + " and from database: " + doc[0].uid + " With timesRead " + doc[0].timesRead);

              times = doc[0].timesRead;

            }
            else // if it does not 
            {


              var toBeSent = {
                uid: req.user._id.toString(),
                textNo: value.no,
                timesRead: 0
              }
              console.log(toBeSent);
              MongoClient.connect(url, function (err, db) {
                if (err) throw err;



                // insert document to 'repeat' collection using insertOne
                db.collection("repeat").insertOne(toBeSent, function (err, res) {
                  if (err) throw err;
                  console.log("Document inserted");
                  // close the connection to db when you are done with it
                  db.close();
                });
              });
            }
          });
          console.log('Value is : ');
          console.log(value); //this value print shows ''
          current = value;
          break;
        }


      };

      current.noOfTimes = times;

      console.log('current.noOfTimes: ' + current.noOfTimes);

      res.send(current);
      console.log(req.user._id);


      db.close();
    });
  });

})

我期望变量'times'保持不变，即它离开循环时的状态，但是我得到的却是0。