将实例存储在Express JS会话中 [英] Store an instance in Express js session

问题描述

我正在使用expressjs会话，并且我有一个实例需要存储:

I'm using the expressjs session, and I have a instance need to store:

function a(){this.name="";}
var ins = new a();
req.session['user'] = ins;

，当我下次获得res.session ['user']时，该对象不是a的instanceof，并且它无法访问a中的任何原型方法， 我如何在会话中存储对象的引用，看起来会话会将其转换为json对象

and when I get res.session['user'] next time, the object is not instanceof a, and it cannot access any prototype methods in a, how can i store the ref of the object in session, looks the session will convert it to json object

推荐答案

除非在以下情况下，否则您不能在JSON中存储类似的实例:

You can't store instances like that in JSON unless:

• 您提供自己的自定义序列化程序(在类/对象中实现toJSON()函数)
• 您还可以在

• You provide your own custom serializer (implementing a toJSON() function in your class/object)
• You also identify your serialized object and instantiate a new instance in the reviver function you pass to JSON.parse().

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