升级Node后，执行npm install出现以下错误：
DLCM50893462A:user-dashboard i318043$ npm install
npm ERR! Darwin 15.6.0
npm ERR! argv "/usr/local/Cellar/node/5.6.0/bin/node" "/usr/local/bin/npm" "install"
npm ERR! node v7.4.0
npm ERR! npm v4.0.5
npm ERR! code MODULE_NOT_FOUND
npm ERR! Cannot find module 'internal/fs'
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR! <https://github.com/npm/npm/issues>
npm ERR! Please include the following file with any support request:
npm ERR! /Users/i318043/z/react/user-dashboard/npm-debug.log
根据“https://github.com/nodejs/node/issues/9377”其中一个回复的描述，大意为需要先为NodeJS，然后安装npm，然后重新升级NodeJS
This worked for me on a Mac:
$ sudo n 6.9.1
$ sudo npm -g install npm@next
$ sudo n stable
$ node -v
v7.2.1
$ npm -v
3.10.10
下面是更新最新Node的方法，不需要像上面那样指定NodeJS的版本号。
https://davidwalsh.name/upgrade-nodejs
sudo npm cache clean -f
sudo npm install -g n
sudo n stable