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> 前言

npm 安装n命令切换node版本 是全局切换
nvm切换node版本可以基于项目目录局部进行切换

> 下载nvm二进制包

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#下载nvm二进制包地址
https://github.com/nvm-sh/nvm/tags

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#安装nvm
[root@test01 ~]# mkdir -p /home/wx/nvm-0.39
[root@test01 ~]# cd /home/wx/nvm-0.39
[root@test01 nvm-0.39]# wget https://github.com/nvm-sh/nvm/archive/refs/tags/v0.39.0.tar.gz
[root@test01 nvm-0.39]# tar xf nvm-0.39.0.tar.gz 
[root@test01 nvm-0.39]# ls -l
total 164
drwxrwxr-x 4 root root 4096 Oct 8 01:11 nvm-0.39.0
-rw-r--r-- 1 root root 163076 Nov 11 11:25 nvm-0.39.0.tar.gz

> 安装nvm

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[root@test01 nvm-0.39.0]# cd /home/wx/nvm-0.39/nvm-0.39.0
[root@test01 nvm-0.39.0]# ls -l
total 252
-rw-rw-r-- 1 root root   2299 Oct  8 01:11 bash_completion
-rw-rw-r-- 1 root root   5424 Oct  8 01:11 CODE_OF_CONDUCT.md
-rw-rw-r-- 1 root root   1057 Oct  8 01:11 CONTRIBUTING.md
-rw-rw-r-- 1 root root   3691 Oct  8 01:11 Dockerfile
-rw-rw-r-- 1 root root    467 Oct  8 01:11 GOVERNANCE.md
-rwxrwxr-x 1 root root  14984 Oct  8 01:11 install.sh
-rw-rw-r-- 1 root root   1113 Oct  8 01:11 LICENSE.md
-rw-rw-r-- 1 root root   5361 Oct  8 01:11 Makefile
-rwxrwxr-x 1 root root    351 Oct  8 01:11 nvm-exec
-rw-rw-r-- 1 root root 138067 Oct  8 01:11 nvm.sh
-rw-rw-r-- 1 root root   2371 Oct  8 01:11 package.json
-rw-rw-r-- 1 root root   2935 Oct  8 01:11 PROJECT_CHARTER.md
-rw-rw-r-- 1 root root  40684 Oct  8 01:11 README.md
-rwxrwxr-x 1 root root   1235 Oct  8 01:11 rename_test.sh
-rw-rw-r-- 1 root root    882 Oct  8 01:11 ROADMAP.md
drwxrwxr-x 9 root root    148 Oct  8 01:11 test
-rwxrwxr-x 1 root root   2364 Oct  8 01:11 update_test_mocks.sh
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# 安装nvm
[root@test01 nvm-0.39.0]# sh install.sh 
=> Downloading nvm from git to '/root/.nvm'
=> Cloning into '/root/.nvm'...
remote: Enumerating objects: 348, done.
remote: Counting objects: 100% (348/348), done.
remote: Compressing objects: 100% (297/297), done.
remote: Total 348 (delta 39), reused 162 (delta 26), pack-reused 0
Receiving objects: 100% (348/348), 210.62 KiB | 0 bytes/s, done.
Resolving deltas: 100% (39/39), done.
* (detached from FETCH_HEAD)
  master
=> Compressing and cleaning up git repository
=> Appending nvm source string to /root/.bashrc
=> Appending bash_completion source string to /root/.bashrc
=> Close and reopen your terminal to start using nvm or run the following to use it now:
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
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[root@test01 nvm-0.39.0]# source /root/.bashrc 

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[root@test01 nvm-0.39.0]# nvm -v
0.39.0

 > Linux的root权限安装nvm后可用，切换用户以后报nvm: command not found解决办法

在root环境下安装nvm，一切正常，但是我切换成普通用户以后，就会报命令找不到，命令找不到肯定就是路径的问题。
以下就是解决办法：
1.首先root环境下，打开~/.bashrc文件，你会看到NVM_DIR，这就是nvm的安装路径。其中有个$HOME这个路径。然后我就去命令行打印了一下$HOME，结果如下：

之后我又切换了普通用户也查看了$HOME,查看结果如下：

两个$HOME都不一样，肯定引不到啊，而且/root下的文件只有root权限才可以访问。

2.将/root/.nvm文件夹移动到了/home/wx/nvm-0.39/（也可以移到别的文件夹下，该路径在环境变量中）下,然后修改~/.bashrc文件，将$HOME改成/home/wx/nvm-0.39
[root@test01 ~]# vim /root/.bashrc
.....
export NVM_DIR="/home/wx/nvm-0.39.0/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
...

[wx@test01 ~]# vim /home/wx/.bashrc
...
export NVM_DIR="/home/wx/nvm-0.39.0/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
...
3.重启~/.bashrc文件
[root@test01 ~]# source /root/.bashrc
[wx@test01 ~]# source /home/wx/.bashrc
4.查看nvm版本
[root@test01 ~]# nvm -v
0.39.0
[wx@test01 ~]# nvm -v
0.39.0

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