本文转载自：http://www.cnblogs.com/fisheleven/p/6775380.html?utm_source=itdadao&utm_medium=referral
引：在安装完nodejs后，通过npm下载全局模块默认安装到{%USERDATA%}C:\Users\username\AppData\下的Roaming\npm下，这当然是不太对的默认。
1，安装LTS版本的nodejs，本文为v6.10.2 (includes npm 3.10.10) .msi，nodejs安装路径会自动添加到PATH环境变量；
本文安装路径为：D:\Program Files\nodejs
修改完成之后：
2，在nodejs安装路径下新建文件夹node_cache用来存放下载包的缓存； 即：D:\Program Files\nodejs\node_cache；
3，运行 npm config set cache "D:\Program Files\nodejs\node_cache" 设置缓存文件夹；
运行npm config set prefix "D:\Program Files\nodejs"设置全局模块存放路径；
注意：nodejs会自动寻找该路径下的node_modules文件夹为实际存放全局模块的路径，这也是为啥叫prefix不叫global的原因；
以后安装的全局模块都会被放到D:\Program Files\nodejs\node_modules下，跟npm模块在一个文件夹中；
4，修改D:\Program Files\nodejs\node_modules\npm\npmrc文件，将默认值改为：
prefix=D:\Program Files\nodejs，如果不做这个修改，则npm在运行 npm ls -g 的时候，仍然以默认的路径来查找已安装的全局模块；
5，运行npm install express -g 以全局方式安装express模块，可发现，在D:\Program Files\nodejs\node_modules下出现express文件夹；
6，运行npm list -g ，列出所有全局模块：
D:\Program Files\nodejs
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包含了express和npm两个模块，及其依赖模块；
7，最后有洁癖的同学可以将用户环境变量中的默认路径删除；
本文包含的方法，并不需要另外设置PATH变量；
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