NodeJS从mongo添加数字

NodeJS adding numbers from mongo

本文关键字：数字 添加 mongo NodeJS      更新时间：2023-09-26

我有这个基本的代码在express 

var currpoints = user.points;
var addedpoints = req.body.points;
var newpoints = currpoints+addedpoints;
user.points = newpoints;

如果currentpoints = 10和addedpoints = 100，则var newpoints返回10100。

我怎么能改变这个，使它添加10 + 100到110?

看起来JavaScript将这些值视为字符串。

你可以这样做:

var currpoints = parseInt(user.points, 10);
var addedpoints = parseInt(req.body.points, 10);
var newpoints = currpoints + addedpoints;

或

var currpoints = user.points;
var addedpoints = req.body.points;
var newpoints = parseInt(currpoints, 10) + parseInt(addedpoints, 10);

然后应该返回正确的数字，而不是将字符串连接在一起。

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