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

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

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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"

(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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  j$ K/ T) P3 X/ }+ G0 Y# L3)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。）


C:\Users\admin>npm install express -g
5 D* v" a. n& v3 y7 k5 \npm WARN notsup Unsupported engine for express@5.1.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})
! x# e' m2 C/ w' ~+ vnpm 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
# x# i, ~$ }$ Bnpm WARN notsup Unsupported engine for body-parser@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: body-parser@2.2.0
' k- ]$ W: ?/ Y8 F- L) p9 W2 H6 Nnpm WARN notsup Unsupported engine for serve-static@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: serve-static@2.2.0
; z# F  ?5 b/ m8 vnpm WARN notsup Unsupported engine for merge-descriptors@2.0.0: wanted: {"node":">=18"} (current: {"node":"12.18.2","npm":"6.14.5"})
. i' r2 u8 Y# Y+ k. g  q6 Wnpm 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"})
* R6 c" ~3 z- L8 E4 ]$ Z% L. cnpm WARN notsup Not compatible with your version of node/npm: path-to-regexp@8.2.0
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+ express@5.1.0
% M- Y7 }3 k) Z" B9 |- o* radded 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。

> require('express')
Uncaught Error: Cannot find module 'express'
$ f$ s, o) _6 \5 cRequire stack:
& e! Y8 J) z1 v9 m- <repl>
/ ~6 o' C$ ~! F$ P    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:966:15)
    at Function.Module._load (internal/modules/cjs/loader.js:842:27)
3 ]" z2 ]1 O3 u7 ?+ O    at Module.require (internal/modules/cjs/loader.js:1026:19)
0 K' ]# u  C* u; g* s* V7 D    at require (internal/modules/cjs/helpers.js:72:18) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '<repl>' ]
7 o+ z- ?" ?% \9 D3 e$ h, }}

: u( ~- K0 R# [+ D- A0 G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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二、安装淘宝npm（cnpm）

1 T; S7 V7 i, a7 A8 h8 j8 ^3 e; E 1.安装cnpm

   (1)输入以下命令
>npm install -g cnpm@4

$ U. ^& v* `" a. F0 u配置cnpm的环境变量即可。