javascript 找不到强大的模块 - Node.js
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Cannot find module formidable - Node.js
提问by bengo
I'm starting to develop with node.j,I meet an issue regarding the using of the module 'formidable'.
我开始使用 node.j 进行开发，我遇到了一个关于使用模块“强大”的问题。
I have this error:
我有这个错误：
Error: Cannot find module 'formidable'
错误：找不到模块“强大”
Here is the module list installed using 'npm ls installed' :
这是使用 'npm ls installed' 安装的模块列表：
├─┬ [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ └── [email protected] ├── [email protected] ├─┬ [email protected] │ ├── [email protected] │ └─┬ [email protected] │ ├── [email protected] │ ├── [email protected] │ └─┬ [email protected] │ ├── [email protected] │ ├── [email protected] │ └── [email protected] ├─┬ [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├─┬ [email protected] │ │ └── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├─┬ [email protected] │ │ ├── [email protected] │ │ └── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ ├── [email protected] │ └── [email protected] └─┬ [email protected] ├── [email protected] ├── [email protected] └─┬ [email protected] ├─┬ [email protected] │ └── [email protected] ├── [email protected] ├─┬ [email protected] │ ├── [email protected] │ └── [email protected] └── [email protected]
I add that it is the only module who generate this error.
我补充说，它是唯一产生此错误的模块。
Also, I don't really understand the way are encapsulated some module, it appears that npm is installing the module directly in the directory I'm using the module installation command, and I notice that formidable has been installed in the express/connect/ module on its first installation.
另外，我不太明白封装一些模块的方式，看来npm是直接在我使用模块安装命令的目录中安装模块的，我注意到express/connect/中已经安装了formidable模块在其第一次安装。
Can you give me more information about the module installation tree.
Thank for your replies
你能给我更多关于模块安装树的信息吗？
感谢您的回复
Cheers
干杯
采纳答案by Jonathan Lonowski
To understand module resolution, have a look at the Modules documentation, especially Loading from node_modulesFolders.
要了解模块解析，请查看模块文档，尤其是从node_modules文件夹加载。
For example, if the file at
'/home/ry/projects/foo.js'calledrequire('bar.js'), then node would look in the following locations, in this order:
/home/ry/projects/node_modules/bar.js/home/ry/node_modules/bar.js/home/node_modules/bar.js/node_modules/bar.js
例如，如果文件
'/home/ry/projects/foo.js'名为require('bar.js')，则节点将按以下顺序查找以下位置：
/home/ry/projects/node_modules/bar.js/home/ry/node_modules/bar.js/home/node_modules/bar.js/node_modules/bar.js
NPM takes advantage of this by installing modules into:
NPM 通过将模块安装到以下位置来利用这一点：
./node_modules/{module}
So, when you use npm install formidable, it will create and install the module into:
因此，当您使用 时npm install formidable，它将创建模块并将其安装到：
./node_modules/formidable
But, this means that only scripts within the current directory, including sub-directories, will succeed in using require('formidable'):
但是，这意味着只有当前目录中的脚本（包括子目录）才能成功使用require('formidable')：
./foo.js
./lib/bar.js
./src/baz.js
./src/sub/qux.js
You can however install modules as "global," but you have to explicitly ask for it with -gor --global:
但是，您可以将模块安装为“全局”，但您必须使用-g或明确要求它--global：
npm install -g formidable
Then, any script on the system should be able to require('formidable').
然后，系统上的任何脚本都应该能够require('formidable').
As for the tree output, you current have 5 installed modules available from the current directory:
至于树输出，您当前有 5 个可从当前目录使用的已安装模块：
expressformidablenode-inspectornpmsocket.io
expressformidablenode-inspectornpmsocket.io
Everything else in the tree is a list of these modules' dependencies, and their dependencies, etc., but only these 5 are available for require(...)within your scripts.
树中的其他所有内容都是这些模块的依赖项及其依赖项等的列表，但require(...)在您的脚本中只有这 5 个可用。
回答by captainclam
The accepted answer looks very comprehensive and correct, but this worked for me:
接受的答案看起来非常全面和正确，但这对我有用：
npm install -d
d stands for dependencies (I think)
d 代表依赖（我认为）
