Windows系统安装多版本的Nodejs

有时候，我们可能会根据不同情况使用不同版本的nodejs环境，nvm支持你在本机安装多个版本的nodejs，具体操作步骤如下：

1、卸载已安装的nodejs，注意把以下目录的文件也删除掉：

C:\Users\Administrator\AppData\Roaming\npm
C:\Users\Administrator\AppData\Roaming\npm-cache
C:\Program Files\nodejs

2、下载nvm-windows，选择nvm-setup.zip，并安装

3、测试是否安装成功，同时可以看到nvm的每个命令的用法

$ nvm -v

Running version 1.1.7.

Usage:

  nvm arch                     : Show if node is running in 32 or 64 bit mode.
  nvm install <version> [arch] : The version can be a node.js version or "latest" for the latest stable version.
                                 Optionally specify whether to install the 32 or 64 bit version (defaults to system arch).
                                 Set [arch] to "all" to install 32 AND 64 bit versions.
                                 Add --insecure to the end of this command to bypass SSL validation of the remote download server.
  nvm list [available]         : List the node.js installations. Type "available" at the end to see what can be installed. Aliased as ls.
  nvm on                       : Enable node.js version management.
  nvm off                      : Disable node.js version management.
  nvm proxy [url]              : Set a proxy to use for downloads. Leave [url] blank to see the current proxy.
                                 Set [url] to "none" to remove the proxy.
  nvm node_mirror [url]        : Set the node mirror. Defaults to https://nodejs.org/dist/. Leave [url] blank to use default url.
  nvm npm_mirror [url]         : Set the npm mirror. Defaults to https://github.com/npm/cli/archive/. Leave [url] blank to default url.
  nvm uninstall <version>      : The version must be a specific version.
  nvm use [version] [arch]     : Switch to use the specified version. Optionally specify 32/64bit architecture.
                                 nvm use <arch> will continue using the selected version, but switch to 32/64 bit mode.
  nvm root [path]              : Set the directory where nvm should store different versions of node.js.
                                 If <path> is not set, the current root will be displayed.
  nvm version                  : Displays the current running version of nvm for Windows. Aliased as v.

4、在国内访问npm源可能比较慢，可以配置成taobao镜像

nvm node_mirror https://npm.taobao.org/mirrors/node/ 
nvm npm_mirror https://npm.taobao.org/mirrors/npm/

5、安装某个版本的node，安装node的同时，npm也会被安装

$ nvm install 11.15.0

6、node安装完成，根据需要使用具体的node版本

$ nvm use 11.15.0
Now using node v11.15.0 (64-bit)

$ npm -v
6.7.0

$ node -v
v11.15.0