Express 4應用程序-節點./bin/www X nodejs ./bin/www

Question

我正在學習使用node和express，我使用express generator設置了一個基本項目，然后將其推送到heroku，但是在日志中遇到了以下錯誤：

2015-12-27T16:29:01.478244+00:00 heroku[web.1]: Starting process with command `npm start`
2015-12-27T16:29:03.533736+00:00 app[web.1]: 
2015-12-27T16:29:03.522320+00:00 app[web.1]: 
2015-12-27T16:29:03.522335+00:00 app[web.1]: > application-name@0.0.1 start /app
2015-12-27T16:29:03.522337+00:00 app[web.1]: > nodejs ./bin/www
2015-12-27T16:29:03.522337+00:00 app[web.1]: 
2015-12-27T16:29:03.526805+00:00 app[web.1]: sh: 1: nodejs: not found
2015-12-27T16:29:03.537910+00:00 app[web.1]: npm ERR! Linux 3.13.0-71-generic
2015-12-27T16:29:03.538285+00:00 app[web.1]: npm ERR! argv "/app/.heroku/node/bin/node" "/app/.heroku/node/bin/npm" "start"
2015-12-27T16:29:03.538482+00:00 app[web.1]: npm ERR! node v0.12.7
2015-12-27T16:29:03.540540+00:00 app[web.1]: npm ERR! npm  v2.11.3
2015-12-27T16:29:03.540543+00:00 app[web.1]: npm ERR! file sh
2015-12-27T16:29:03.540544+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2015-12-27T16:29:03.540544+00:00 app[web.1]: npm ERR! errno ENOENT
2015-12-27T16:29:03.540545+00:00 app[web.1]: npm ERR! syscall spawn
2015-12-27T16:29:03.540547+00:00 app[web.1]: npm ERR! spawn ENOENT
2015-12-27T16:29:03.540546+00:00 app[web.1]: npm ERR! application-name@0.0.1 start: `nodejs ./bin/www`
2015-12-27T16:29:03.540547+00:00 app[web.1]: npm ERR! 
2015-12-27T16:29:03.540548+00:00 app[web.1]: npm ERR! Failed at the application-name@0.0.1 start script 'nodejs ./bin/www'.
2015-12-27T16:29:03.540549+00:00 app[web.1]: npm ERR! This is most likely a problem with the application-name package,
2015-12-27T16:29:03.540549+00:00 app[web.1]: npm ERR! not with npm itself.
2015-12-27T16:29:03.540550+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
2015-12-27T16:29:03.540551+00:00 app[web.1]: npm ERR!     nodejs ./bin/www
2015-12-27T16:29:03.540552+00:00 app[web.1]: npm ERR! You can get their info via:
2015-12-27T16:29:03.540714+00:00 app[web.1]: npm ERR!     npm owner ls application-name
2015-12-27T16:29:03.540922+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
2015-12-27T16:29:03.543464+00:00 app[web.1]: 
2015-12-27T16:29:03.543727+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
2015-12-27T16:29:03.543869+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
2015-12-27T16:29:04.374697+00:00 heroku[web.1]: Process exited with status 1
2015-12-27T16:29:04.392014+00:00 heroku[web.1]: State changed from starting to crashed

當我更改此設置后它開始工作

"scripts": {
    "start": "nodejs ./bin/www"
  },

對此

"scripts": {
    "start": "node ./bin/www"
  },

但是我不知道為什么，沒有人能解釋node和nodejs之間的區別，以及它如何與heroku一起工作。

謝謝

Answer 1

Express generator將創建一個啟動腳本，該腳本運行命令node ./bin/www ，該腳本通過運行.bin/www JavaScript文件來啟動Express應用程序。 問題是沒有/沒有命令標記過的nodejs ，但是有一個稱為node （指向node.js可執行文件）。

Nodejs（node.js）通常簡稱為node ，對於命令提示符通常如此。