nodejs版本控制：nvm use命令失效

Downloading npm version 6.4.1... Download failed. Rolling Back.
Rollback failed. remove C:UsersAdministratorAppDataRoaming
vm	emp
pm-v6.4.1.zip: The process cannot access the file because
 it is being used by another process.
Could not download npm for node v10.15.3.
Please visit https://github.com/npm/npm/releases/tag/v6.4.1 to download npm.
It should be extracted to C:UsersAdministratorAppDataRoaming
vmv10.15.3

下载完整的10.15.3版本，并替换掉nvm中的10.15.3版本文件夹，重新执行命令nvm use 10.15.3，项目成功启动。