找不到Express命令

Question

由于某种原因，在使用npm install -g express的机器上全局安装Express后，如果我将cd放入目录并尝试运行Express，我会收到以下错误：

express: command not found. 

即使我用sudo运行它，我仍然得到相同的输出。对于这个问题，我尝试了多种不同的解决方案，但都没有奏效。我通过homebrew安装了节点，Stack Overflow上的一些线程表示这可能是一个问题，所以我完全卸载了节点，并通过nodejs.org上的安装程序重新安装（我现在运行的是v0.10.26），但问题仍然存在。

如果我进入我的/usr/local/lib/node_modules Express，它在那里，但在/usr/local/bin中没有任何关于Express的内容。我不确定这是否有问题，但考虑到该目录中有其他全局安装的节点包的二进制文件，我认为可能有问题。

这是我安装时得到的确切输出：

npm http GET https://registry.npmjs.org/express
npm http 304 https://registry.npmjs.org/express
npm http GET https://registry.npmjs.org/accepts/1.0.0
npm http GET https://registry.npmjs.org/type-is/1.0.0
npm http GET https://registry.npmjs.org/range-parser/1.0.0
npm http GET https://registry.npmjs.org/cookie/0.1.0
npm http GET https://registry.npmjs.org/fresh/0.2.2
npm http GET https://registry.npmjs.org/buffer-crc32/0.2.1
npm http GET https://registry.npmjs.org/send/0.2.0
npm http GET https://registry.npmjs.org/methods/0.1.0
npm http GET https://registry.npmjs.org/cookie-signature/1.0.3
npm http GET https://registry.npmjs.org/utils-merge/1.0.0
npm http GET https://registry.npmjs.org/merge-descriptors/0.0.2
npm http GET https://registry.npmjs.org/escape-html/1.0.1
npm http GET https://registry.npmjs.org/serve-static/1.0.1
npm http GET https://registry.npmjs.org/qs/0.6.6
npm http GET https://registry.npmjs.org/path-to-regexp/0.1.2
npm http GET https://registry.npmjs.org/parseurl/1.0.1
npm http GET https://registry.npmjs.org/debug
npm http 304 https://registry.npmjs.org/cookie/0.1.0
npm http 304 https://registry.npmjs.org/type-is/1.0.0
npm http 304 https://registry.npmjs.org/buffer-crc32/0.2.1
npm http 304 https://registry.npmjs.org/methods/0.1.0
npm http 304 https://registry.npmjs.org/accepts/1.0.0
npm http 304 https://registry.npmjs.org/range-parser/1.0.0
npm http 304 https://registry.npmjs.org/cookie-signature/1.0.3
npm http 304 https://registry.npmjs.org/fresh/0.2.2
npm http 304 https://registry.npmjs.org/serve-static/1.0.1
npm http 304 https://registry.npmjs.org/qs/0.6.6
npm http 304 https://registry.npmjs.org/utils-merge/1.0.0
npm http 304 https://registry.npmjs.org/merge-descriptors/0.0.2
npm http 304 https://registry.npmjs.org/escape-html/1.0.1
npm http 304 https://registry.npmjs.org/path-to-regexp/0.1.2
npm http 304 https://registry.npmjs.org/parseurl/1.0.1
npm http 304 https://registry.npmjs.org/debug
npm http 304 https://registry.npmjs.org/send/0.2.0
npm http GET https://registry.npmjs.org/mime
npm http GET https://registry.npmjs.org/send/0.1.4
npm http GET https://registry.npmjs.org/mime
npm http GET https://registry.npmjs.org/negotiator
npm http 304 https://registry.npmjs.org/mime
npm http 304 https://registry.npmjs.org/mime
npm http 304 https://registry.npmjs.org/send/0.1.4
npm http GET https://registry.npmjs.org/range-parser/0.0.4
npm http GET https://registry.npmjs.org/fresh/0.2.0
npm http 304 https://registry.npmjs.org/negotiator
npm http 304 https://registry.npmjs.org/range-parser/0.0.4
npm http 304 https://registry.npmjs.org/fresh/0.2.0
express@4.0.0 /usr/local/lib/node_modules/express
├── methods@0.1.0
├── parseurl@1.0.1
├── utils-merge@1.0.0
├── merge-descriptors@0.0.2
├── escape-html@1.0.1
├── debug@0.8.0
├── cookie-signature@1.0.3
├── range-parser@1.0.0
├── fresh@0.2.2
├── qs@0.6.6
├── buffer-crc32@0.2.1
├── cookie@0.1.0
├── path-to-regexp@0.1.2
├── type-is@1.0.0 (mime@1.2.11)
├── send@0.2.0 (mime@1.2.11)
├── serve-static@1.0.1 (send@0.1.4)
└── accepts@1.0.0 (negotiator@0.3.0, mime@1.2.11)

Answer 1

随着Express 4.0.0的发布，您似乎需要执行sudo npm install -g express-generator。

Answer 2

您需要运行：

npm install -gd express-generator

原来的express带有cli，现在的cli拆分为单独的express生成器包。最初由项目生成的是运行express节点的app.js，因为httpserver相关代码在app.js中，而现在这部分代码到了项目目录bin/www下面，app.js只保留实现应用程序逻辑的代码，需要运行bin/www。只是一个非常简单的应用程序和精化包的依赖性版本更改。

Answer 3

我有好几天都在接受这个挑战。经过深入搜索，我了解到必须读取每一个可用的资源，尤其是来自父源的资源。

从4.0+版本开始，如果你运行的是Node 8.2+，你不一定需要安装express生成器。只需运行

npx express-generator

express生成器将按照您运行时的运行方式运行：express

有关更多详细信息，请参阅入门

快乐的阅读和研究时间。

Answer 4

我最近一直在尝试安装express生成器，但它会失败，

$ zsh : command not found : express

那是在我做之后

$ sudo npm install -g express
$ sudo npm install -g express-generator

但后来，我看到了npm安装命令和的控制台日志

/usr/local/Cellar/node/13.1.0/bin/express -> /usr/local/Cellar/node/13.1.0/lib/node_modules/express-generator/bin/express-cli.js

这给出了可执行express在bin文件夹中的提示。

因此，解决方案是：打开~/.zshrc或~/.bashrc并导出路径如下：

export PATH=/usr/local/Cellar/node/13.1.0/bin:$PATH

它现在起作用了。