nvm之node多版本管理

简介：

nvm：nodejs 版本管理工具，一个nvm可以管理很多node版本和npm版本
nodejs：在项目开发时的所需要的代码库
npm：nodejs 包管理工具

nvm、nodejs、npm的关系：

nvm 管理 nodejs 和 npm 的版本。npm 可以管理 nodejs 的第三方插件。

安装 nvm

可以使用curl

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash

或者使用wget

wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash

都可以的，到这步一般情况下都没问题，然后终端输入 nvm，然后看到如下打印信息就可以了

Node Version Manager
Note: refers to any version-like string nvm understands. This includes:
- full or partial version numbers, starting with an optional "v" (0.10, v0.1.2, v1)
- default (built-in) aliases: node, stable, unstable, iojs, system
- custom aliases you define with `nvm alias foo`
Any options that produce colorized output should respect the `--no-colors` option.
Usage:
nvm --help Show this message
nvm --version Print out the installed version of nvm
nvm install [-s] Download and install a , [-s] from source. Uses .nvmrc if available
--reinstall-packages-from= When installing, reinstall packages installed in
--lts When installing, only select from LTS (long-term support) versions
--lts= When installing, only select from versions for a specific LTS line
--skip-default-packages When installing, skip the default-packages file if it exists
--latest-npm After installing, attempt to upgrade to the latest working npm on the given node version
--no-progress Disable the progress bar on any downloads
nvm uninstall Uninstall a version
nvm uninstall --lts Uninstall using automatic LTS (long-term support) alias `lts/*`, if available.
nvm uninstall --lts= Uninstall using automatic alias for provided LTS line, if available.
nvm use [--silent] Modify PATH to use . Uses .nvmrc if available
--lts Uses automatic LTS (long-term support) alias `lts/*`, if available.
--lts= Uses automatic alias for provided LTS line, if available.
nvm exec [--silent] [] Run on . Uses .nvmrc if available
--lts Uses automatic LTS (long-term support) alias `lts/*`, if available.
--lts= Uses automatic alias for provided LTS line, if available.
nvm run [--silent] [] Run `node` on with as arguments. Uses .nvmrc if available
--lts Uses automatic LTS (long-term support) alias `lts/*`, if available.
--lts= Uses automatic alias for provided LTS line, if available.
nvm current Display currently activated version of Node
nvm ls List installed versions
nvm ls List versions matching a given
nvm ls-remote List remote versions available for install
--lts When listing, only show LTS (long-term support) versions
nvm ls-remote List remote versions available for install, matching a given
--lts When listing, only show LTS (long-term support) versions
--lts= When listing, only show versions for a specific LTS line
nvm version Resolve the given description to a single local version
nvm version-remote Resolve the given description to a single remote version
--lts When listing, only select from LTS (long-term support) versions
--lts= When listing, only select from versions for a specific LTS line
nvm deactivate Undo effects of `nvm` on current shell
nvm alias [

] Show all aliases beginning with


nvm alias Set an alias named pointing to
nvm unalias Deletes the alias named
nvm install-latest-npm Attempt to upgrade to the latest working `npm` on the current node version
nvm reinstall-packages Reinstall global `npm` packages contained in to current version
nvm unload Unload `nvm` from shell
nvm which [current | ] Display path to installed node version. Uses .nvmrc if available
nvm cache dir Display path to the cache directory for nvm
nvm cache clear Empty cache directory for nvm
Example:
nvm install 8.0.0 Install a specific version number
nvm use 8.0 Use the latest available 8.0.x release
nvm run 6.10.3 app.js Run app.js using node 6.10.3
nvm exec 4.8.3 node app.js Run `node app.js` with the PATH pointing to node 4.8.3
nvm alias default 8.1.0 Set default node version on a shell
nvm alias default node Always default to the latest available node version on a shell
Note:
to remove, delete, or uninstall nvm - just remove the `$NVM_DIR` folder (usually `~/.nvm`)

如果呢，你没有看到，而是出现 command not found: nvm 你可以排查下是否有.bash_profile 这个文件，别人都是这么说的，你可以排查下，没有这个文件就建一个，然后把如下加入到环境变量里保存，然后source ~/.bashrc这个命令生效，就可以了，更多请详见nvm

export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm

nvm 常用命令

nvm install stable ## 安装最新稳定版 node，当前是node v9.5.0 (npm v5.6.0)
nvm install ## 安装指定版本，可模糊安装，如：安装v4.4.0，既可nvm install v4.4.0，又可nvm install 4.4
nvm uninstall ## 删除已安装的指定版本，语法与install类似
nvm use ## 切换使用指定的版本node
nvm ls ## 列出所有安装的版本
nvm ls-remote ## 列出所有远程服务器的版本（官方node version list）
nvm current ## 显示当前的版本
nvm alias ## 给不同的版本号添加别名
nvm unalias ## 删除已定义的别名
nvm reinstall-packages ## 在当前版本 node 环境下，重新全局安装指定版本号的 npm 包

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