windows下node多版本管理NVM安装
下载nvm-windows 最新下载地址：
https://github.com/coreybutler/nvm-windows/releases
注意事项
[*]选择nvm安装的路径中最好不要出现空格和中文
[*]如果之前安装过node环境需要先卸载
安装完nvm之后输入nvm list如下：
PS C:\Users\Administrator\Desktop\nodejs> nvm list
No installations recognized.
安装node
[*] 运行nvm install 8.11.4 64-bit
PS C:\Users\Administrator\Desktop\nodejs> nvm install 8.11.4 64-bit
Downloading node.js version 8.11.4 (64-bit)...
Complete
Creating D:\Node\nvm\temp
Downloading npm version 5.6.0... Complete
Installing npm v5.6.0...
Installation complete. If you want to use this version, type
nvm use 8.11.4
[*]运行nvm use 8.11.4,使用8.11.4版本的node环境
PS C:\Users\Administrator\Desktop\nodejs> nvm use 8.11.4
Now using node v8.11.4 (64-bit)
查看当前node
PS C:\Users\Administrator\Desktop\nodejs> node -v
v8.11.4
PS C:\Users\Administrator\Desktop\nodejs> npm -v
5.6.0
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