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

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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  

/ ]( S( Y. V; l/ l# d3)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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0 m" ?; M0 i( ]6 x8 s# i- ^C:\Users\admin>npm install express -g
1 ]4 C' K( I2 K0 m- o9 R, Rnpm WARN notsup Unsupported engine for express@5.1.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})
npm 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"})
, h1 ]7 k5 {* N: `) X) X' Fnpm WARN notsup Not compatible with your version of node/npm: router@2.2.0
3 b9 ]9 i7 s/ W1 A$ ~# Unpm 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 w4 T+ m# G. K1 q6 E2 P+ Nnpm WARN notsup Not compatible with your version of node/npm: body-parser@2.2.0
npm WARN notsup Unsupported engine for serve-static@2.2.0: wanted: {"node":">= 18"} (current: {"node":"12.18.2","npm":"6.14.5"})
* p, ?* v8 F* L7 k) J3 cnpm WARN notsup Not compatible with your version of node/npm: serve-static@2.2.0
+ i) k( U) G' C+ W+ f* ?* |" Dnpm WARN notsup Unsupported engine for merge-descriptors@2.0.0: wanted: {"node":">=18"} (current: {"node":"12.18.2","npm":"6.14.5"})
: M6 I; N" O9 Y: n* Q: onpm 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"})
( k5 P, h4 A2 y9 A( ?npm WARN notsup Not compatible with your version of node/npm: path-to-regexp@8.2.0
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! z* F  D4 N3 Y; I! m+ express@5.1.0
* V  \* W! p% H; x& Tadded 66 packages from 42 contributors in 18.426s
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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'
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)
    at Module.require (internal/modules/cjs/loader.js:1026:19)
    at require (internal/modules/cjs/helpers.js:72:18) {
" `3 V8 L6 \6 E; V+ g# D  code: 'MODULE_NOT_FOUND',
0 D1 F$ k5 W' p: D  requireStack: [ '<repl>' ]
}

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）

4 l9 R' O7 S# _ 1.安装cnpm
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- {/ ^9 J6 L7 q9 T  b   (1)输入以下命令
>npm install -g cnpm@4
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8 F4 m. i8 N. i% I8 v8 D配置cnpm的环境变量即可。