windows 下安装npm以及cnpm的过程

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windows 下安装npm以及cnpm的过程
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安装步骤】

一、安装node.js

1.前往node.js官网下载并安装工具，这里安装路径选到c盘，c:\Program Files\nodejs

安装完毕在命令行输入以下命令测试是否安装成功，正确会出现版本号

C:\Users\admin>npm -v

6.14.5

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2.改变原有的环境变量，

  (1)我们要先配置npm的全局模块的存放路径以及cache的路径，例如我希望将以上两个文件夹放在NodeJS的主目录下，便在NodeJs下建立"global"及"cache"两个文件夹，输入以下命令改变npm配置

C:\Users\admin>npm config set prefix "c:\Program Files\nodejs\global"

C:\Users\admin>npm config set cache "c:\Program Files\nodejs\cache"

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(2)在系统环境变量添加系统变量NODE_PATH，输入路径D:\Program Files\nodejs\global\node_modules，此后所安装的模块都会安装到改路径下  
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3)在命令行输入以下命令试着安装express（注：“-g”这个参数意思是装到global目录下，也就是上面说设置的“D:\Program Files\nodejs\global”里面。）
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) Q) f$ r3 b2 G# C- o0 t+ jC:\Users\admin>npm install express -g
npm WARN notsup Unsupported engine for express@5.1.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})
: P* C/ a' Q+ J$ d7 K: N6 _4 lnpm WARN notsup Not compatible with your version of node/npm: express@5.1.0
npm WARN notsup Unsupported engine for router@2.2.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})
npm WARN notsup Not compatible with your version of node/npm: router@2.2.0
npm WARN notsup Unsupported engine for send@1.2.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})npm WARN notsup Not compatible with your version of node/npm: send@1.2.0
npm WARN notsup Unsupported engine for body-parser@2.2.0: wanted: {"node":">=18"} (current: {"node":"12.18.2","npm":"6.14.5"})
7 ~1 t3 G" `4 C9 L& x" @1 cnpm WARN notsup Not compatible with your version of node/npm: body-parser@2.2.0
* ^7 W5 b6 R+ l# O( }npm WARN notsup Unsupported engine for serve-static@2.2.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})
' u) K: G  H3 U. c( S* Hnpm WARN notsup Not compatible with your version of node/npm: serve-static@2.2.0
npm WARN notsup Unsupported engine for merge-descriptors@2.0.0: wanted: {"node":">=18"} (current: {"node":"12.18.2","npm":"6.14.5"})
8 E/ E- `! g- m. ~0 h: hnpm WARN notsup Not compatible with your version of node/npm: merge-descriptors@2.0.0
npm WARN notsup Unsupported engine for path-to-regexp@8.2.0: wanted: {"node":">=16"} (current: {"node":"12.18.2","npm":"6.14.5"})
npm WARN notsup Not compatible with your version of node/npm: path-to-regexp@8.2.0
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+ express@5.1.0
added 66 packages from 42 contributors in 18.426s

安装完成之后，既可以查到到nodejs目录下global目录有内容了。
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, {; G5 Q0 V$ L) |* l1 b4 h> require('express')
: H5 K  Z1 Y7 ^8 f9 r5 C9 XUncaught Error: Cannot find module 'express'
Require stack:
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    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:966:15)
    at Function.Module._load (internal/modules/cjs/loader.js:842:27)
0 n' }) B8 Y3 `    at Module.require (internal/modules/cjs/loader.js:1026:19)
    at require (internal/modules/cjs/helpers.js:72:18) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '<repl>' ]
}

) W' j. p4 j) C/ q! m# x假设成功，可以看到有输出。假设出错，检查NODE_PATH的路径。

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admin

二、安装淘宝npm（cnpm）
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1.安装cnpm

8 i! [5 [3 R9 e& |/ B/ r. M: ^   (1)输入以下命令
# G3 {7 i6 X9 G# A! p>npm install -g cnpm@4
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配置cnpm的环境变量即可。