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

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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

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

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

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& H: h; k# s% q0 [( f' A$ g+ x: r(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  

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。）


% [7 H& j' ^! B! p: Q& [4 ?C:\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"})
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"})
( a/ J: R0 U& t; \$ `) e8 tnpm 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
/ W5 _6 ~. y" m4 s8 Bnpm WARN notsup Unsupported engine for body-parser@2.2.0: wanted: {"node":">=18"} (current: {"node":"12.18.2","npm":"6.14.5"})
( w. L/ e7 m* {6 _npm WARN notsup Not compatible with your version of node/npm: body-parser@2.2.0
' [: b; j8 _9 z) E& y6 Rnpm 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
npm WARN notsup Unsupported engine for merge-descriptors@2.0.0: wanted: {"node":">=18"} (current: {"node":"12.18.2","npm":"6.14.5"})
: a8 `) R* l5 D2 w0 u9 Jnpm 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"})
# a  N( C8 }3 {6 [; a; ?npm WARN notsup Not compatible with your version of node/npm: path-to-regexp@8.2.0
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# S( s& y+ j5 a# H: Z+ express@5.1.0
' @2 k, `- n3 v  n5 G7 k+ Zadded 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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> require('express')
8 s( ]' L& \. B6 P3 ~' x. a# SUncaught Error: Cannot find module 'express'
Require stack:
- <repl>
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: Q( m5 k" R5 `    at Function.Module._load (internal/modules/cjs/loader.js:842:27)
    at Module.require (internal/modules/cjs/loader.js:1026:19)
8 B3 w3 N# V2 s8 S1 z% d1 f    at require (internal/modules/cjs/helpers.js:72:18) {
  code: 'MODULE_NOT_FOUND',
* a0 A' n3 |4 b; M  `* ?6 V) [' w$ H  requireStack: [ '<repl>' ]
}

% a* z5 h& U/ R6 ~' O% g& D+ `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）
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1.安装cnpm

: F8 T8 B) k2 r' _   (1)输入以下命令
>npm install -g cnpm@4
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配置cnpm的环境变量即可。