nvm安装、解决nvm command not found问题、卸载

安装

nvm是node的包版本管理工具，github地址如下：nvm

安装命令

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash

nvm //检查nvm是否安装成功
-bash: nvm: command not found  //boom，失败了

解决nvm command not found问题

进入.nvm文件夹，新建.bash_profile：

touch .bash_profile //新建文件
open .bash_profile //打开文件

在里面copy如下内容：

export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm

关闭文件，然后执行这个文件：

source .bash_profile

执行完毕，我们再看看是否安装成功：

nvm --version

输出：

0.33.8

安装成功。

卸载：

$ nvm use system
$ npm uninstall -g a_module

安装问题:

1. How to recover from broken old npm.

Old npm won’t work with new node:

npm -v

/Users/marcus/.nvm/v0.10.48/lib/node_modules/npm/bin/npm-cli.js:79
      let notifier = require('update-notifier')({pkg})
          ^^^^^^^^
SyntaxError: Unexpected identifier
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:945:3

Install old node:

nvm install 4.8.4
npm i -g npm
/Users/marcus/.nvm/versions/node/v4.8.4/bin/npm -> /Users/marcus/.nvm/versions/node/v4.8.4/lib/node_modules/npm/bin/npm-cli.js
/Users/marcus/.nvm/versions/node/v4.8.4/bin/npx -> /Users/marcus/.nvm/versions/node/v4.8.4/lib/node_modules/npm/bin/npx-cli.js
[email protected] /Users/marcus/.nvm/versions/node/v4.8.4/lib/node_modules/npm

Now new npm won’t work with old node:

npm -v
/Users/marcus/.nvm/versions/node/v4.8.4/lib/node_modules/npm/bin/npm-cli.js:79
      let notifier = require('update-notifier')({pkg})
      ^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:140:18)
    at node.js:1043:3

Reinstall node 10:

nvm install 10
Now using node v10.1.0 (npm v5.6.0)

I don’t know why npm somehow went to 5.6.0 there, but now update it:

npm install -g npm
/Users/marcus/.nvm/versions/node/v10.1.0/bin/npx -> /Users/marcus/.nvm/versions/node/v10.1.0/lib/node_modules/npm/bin/npx-cli.js
/Users/marcus/.nvm/versions/node/v10.1.0/bin/npm -> /Users/marcus/.nvm/versions/node/v10.1.0/lib/node_modules/npm/bin/npm-cli.js
+ [email protected]
added 246 packages, removed 40 packages and updated 125 packages in 22.342s

And now it’s happy:

npm -v
6.0.1

You might want to remove old node versions now.

参考：

1. npm upgrade prompt should show warning when current node version is not supported in newer version
2. nvm安装、解决nvm command not found问题、卸载
3. linux下安装nvm
4. ubuntu上安装并使用nvm管理node版本