TypeError: Cannot read property 'username' of undefined

Answer 1

CocoIloveu 2023-03-12 21:46:24

我也是出现了相同的情况，是要把getPostDate(req)放在get函数里面，变成链式调用，不然就是同步的，会造成数据的丢失，就会报错

Answer 2

双越 2019-08-14 21:31:27

看下你 src\router\user.js:32:18 这行，以及其上下文的代码，截图贴出来。

Answer 3

双越 2019-08-14 19:20:37

具体哪一行报错？

（提醒一下，再提问的时候，尽量把所有报错信息都写上，更多信息有助于更快的定位问题）

• 提问者 言戊戌 #1

  > cross-env NODE_ENV=dev nodemon ./bin/www.js
  
  [nodemon] 1.19.1
  [nodemon] to restart at any time, enter `rs`
  [nodemon] watching: *.*
  [nodemon] starting `node ./bin/www.js`
  req.sessionId 1565780724588_0.8694839660240226
  user组件的req.session是 undefined
  (node:3804) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'username' of undefined
      at handleUserRouter (E:\node\blog\src\router\user.js:32:18)
      at getPostData.then.postData (E:\node\blog\app.js:140:22)
      at process._tickCallback (internal/process/next_tick.js:68:7)
  (node:3804) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
  (node:3804) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.