终端安装 homebrew
$ ruby -e "$(curl -fsSL https:/raw.githubusercontent.com/Homebrew/install/master/install)"更新 brew
$ brew update确保brew安全可靠
$ brew doctor可能会出现如下情况 ，可针对逐条处理:
Warning: Some directories in /usr/local/share/man aren’t writable. This can happen if you “sudo make install” software that isn’t managed by Homebrew. If a brew tries to add locale information to one of these directories, then the install will fail during the link step.
You should probably sudo chown -R $(whoami) them: /usr/local/share/man/man5
/usr/local/share/man/man7
将brew 添加到环境变量中，并保存 bash 或者 profile中
$ export PATH="usr/local/bin:$PATH"brew 安装完成。如果在上面安装中出现如下错误信息
Warning: You have unlinked kegs in your Cellar Leaving kegs unlinked can lead to build-trouble and cause brews that depend on those kegs to fail to run properly once built. Run brew link on these:
就需要如下操作
清除brew的link
$ brew cleanup删除node文件，完全卸载node和npm
$ sudo rm -rf /usr/local/{lib/node{,/.npm,_modules},bin,share/man}/{npm*,node*,man1/node*}或者
$ sudo rm -rf /usr/local/bin/npm /usr/local/share/man/man1/node* /usr/local/lib/dtrace/node.d ~/.npm ~/.node-gyp /opt/local/bin/node opt/local/include/node /opt/local/lib/node_modules或者这样
在/usr/local/lib目录下，删除任何与node和 node_modules有关的目录；
在/usr/local/include 目录下，删除任何与node 和 node_modules有关的目录；
如果你是通过 brew install node 安装的node，则在终端执行brew uninstall node ，并在home目录下查找 local 或lib 或 include文件夹，删除任何与node 和 node_modules有关的目录；在/usr/local/bin目录下，删除任何与 node 执行文件；最后下载 nvm ，跟随它的介绍安装node。当然，你也可以通过npm来安装最新版本的Node。通过安装一个模块测试node 和npm 是否安装成功 express
$ npm install -g express如果按照成功，那么 npm 和node就都安装成功了
