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# MacOS 下 nvm 的安装

版本记录：
2020.09.18 初版
2020.09.19 解决环境变量添加后，每次打开都需要重新 source .bash_profile 的问题

# 一、使用 curl 安装的步骤

# 1. 安装命令：

$ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash

# 2. 可能遇到的问题：

curl: (7) Failed to connect to raw.githubusercontent.com port 443: Connection refused


此问题的解决方案请参照一下这篇文章：
《curl: (7) Failed to connect to raw.githubusercontent.com port 443: Connection refused》

# 3. 安装：

# 4. 检查是否安装成功

关闭再打开终端，输入

$ nvm --version

# 5. 可能遇到的问题

zsh: command not found: nvm

# 6. 解决问题 5 的步骤：

# ① 再次安装，提示已经安装了 nvm（不用执行）

username@usernamedeMacBook-Pro ~ % curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 13527  100 13527    0     0   9946      0  0:00:01  0:00:01 --:--:--  9939
=> nvm is already installed in /Users/username/.nvm, trying to update using git
=> => Compressing and cleaning up git repository

=> nvm source string already in /Users/username/.bash_profile
=> bash_completion source string already in /Users/username/.bash_profile
npm ERR! error in /usr/local/lib/node_modules/egret: ENOENT: no such file or directory, open '/usr/local/lib/node_modules/egret/package.json'
=> You currently have modules installed globally with `npm`. These will no
=> longer be linked to the active version of Node when you install a new node
=> with `nvm`; and they may (depending on how you construct your `$PATH`)
=> override the binaries of modules installed with `nvm`:

/usr/local/lib
├── cnpm@6.1.1
├──  error: ENOENT: no such file or directory, open '/usr/local/lib/node_modules/egret/package.json
├── hexo-cli@4.2.0
=> If you wish to uninstall them at a later point (or re-install them under your
=> `nvm` Nodes), you can remove them from the system Node as follows:

     $ nvm use system
     $ npm uninstall -g a_module

=> 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

# ② 配置.bash_profile（环境变量）

# 进入当前用户的home目录
$ cd ~/
# 创建. bash_profile文件
$ touch .bash_profile 
# 创建. bash_profile文件
$ open .bash_profile

在打开的记事本中加入

export NVM_DIR=~/.nvm
source ~/.nvm/nvm.sh

# ③ 使加入的环境变量生效（很重要）

source .bash_profile

# ④ 输入 nvm --version 检查是否生效


这里已经显示安装的 nvm 版本了，说明安装成功啦～～～

你以为到这里就结束了吗？当然没有！！还是有可能出现以下问题：

环境变量添加后，每次打开都需要重新 source .bash_profile 才能使 nvm 生效，否则依然提示 zsh: command not found: nvm

# ⑤ 在.zshrc 中添加环境变量

  • 在通过终端在记事本中打开.zshrc
# 注意是在当前用户的home目录
$ open .zshrc
  • 在.zshrc 文件末尾处添加以下环境变量：
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm
  • 关闭记事本后，在终端中重新启动.zshrc 配置
$ source .zshrc
  • 这样，以后每次新打开一个 bash，nvm 都会被自动添加到环境变量中了。