要在当前目录中安装package.json的软件包，您需要运行npm install命令。
是否可以在特定文件夹中安装package.json的软件包，而无需转到该文件夹？`
已经找到了bower和gulp任务的解决方案：

bower install --config.cwd=<directory>
gulp build --cwd <directory>

字符串
但缺少npm的类似功能
当我运行命令时：npm install --prefix C:\Users\ng\Projects\Lottery\src\SPA我看到一个错误：

npm ERR! addLocal Could not install C:\Users\ng\Projects
npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "--prefix" "C:\\Users\\ng\\Projects\\Lottery\\src\\SPA"
npm ERR! node v6.2.1
npm ERR! npm  v3.9.3
npm ERR! code EISDIR
npm ERR! errno -4068
npm ERR! syscall read

npm ERR! eisdir EISDIR: illegal operation on a directory, read
npm ERR! eisdir This is most likely not a problem with npm itself
npm ERR! eisdir and is related to npm not being able to find a package.json in
npm ERR! eisdir a package you are trying to install.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\Users\ng\Projects\npm-debug.log

型
从文档中：
前缀config默认为安装节点的位置。在大多数系统上，这是/usr/local。在Windows上，这是node.exe二进制文件的确切位置