Express 4 应用程序 - 节点 ./bin/www X nodejs ./bin/www

Question

我正在学习使用 node 和 express，我使用 express 生成器设置了一个基本项目并将其推送到 heroku，但我在日志中收到此错误：

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

当我更改它时它开始工作

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

至此

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

但我不知道为什么，谁能解释一下 node 和 nodejs 之间的区别，以及它如何与 heroku 一起工作。

感谢

Answer 1

Express 生成器创建一个启动脚本，该脚本运行命令 node ./bin/www，通过运行 .bin/www JavaScript 文件启动您的 Express 应用程序。问题是 is/was 没有标记为 nodejs 的命令，但是有一个名为 node 的命令（它指向 node.js 可执行文件）。

Nodejs (node.js) 通常简称为 node，命令提示符通常也是如此。

Express 4 应用程序 - 节点 ./bin/www X nodejs ./bin/www

Express 4 app - node ./bin/www X nodejs ./bin/www

node.js

heroku

express-4