nodejs设置session属性时报错Cannot set property ‘xxx‘ of undefined

ゝ一纸荒年。 2022-10-17 10:43 8阅读 0赞

# nodejs设置session属性时报错Cannot set property ‘xxx’ of undefined #

这几天在学习node的过程中，想设置session和cookie，从而保存用户的登录状态，但是中途发现老报错。

## 翻车现场 ##

**原因：session写的位置不对**  
![在这里插入图片描述][20210602131157589.png]

TypeError: Cannot set property 'age' of undefined
        at D:\fore-end\node\10-project\routes\index.js:8:22
        at Layer.handle [as handle_request] (D:\fore-end\node\10-project\node_modules\express\lib\router\layer.js:95:5)
        at next (D:\fore-end\node\10-project\node_modules\express\lib\router\route.js:137:13)
        at Route.dispatch (D:\fore-end\node\10-project\node_modules\express\lib\router\route.js:112:3)
        at Layer.handle [as handle_request] (D:\fore-end\node\10-project\node_modules\express\lib\router\layer.js:95:5)
        at D:\fore-end\node\10-project\node_modules\express\lib\router\index.js:281:22
        at Function.process_params (D:\fore-end\node\10-project\node_modules\express\lib\router\index.js:335:12)
        at next (D:\fore-end\node\10-project\node_modules\express\lib\router\index.js:275:10)
        at Function.handle (D:\fore-end\node\10-project\node_modules\express\lib\router\index.js:174:3)
        at router (D:\fore-end\node\10-project\node_modules\express\lib\router\index.js:47:12)

## 解决方案 ##

app.use(session())应该放在app.use(router)路由之前，细节拉满！

[20210602131157589.png]: /images/20221014/1fc598fd73c647c58d28dbcfcc579098.png