Downloading npm version 6.4.1... Download failed. Rolling Back. Rollback failed. remove C:\Users\Administrator\AppData\Roaming\nvm\temp\npm-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:\Users\Administrator\AppData\Roaming\nvm\v10.15.3
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。