执行bower命令后出现以下错误提示：
bower ESUDO Cannot be run with sudo
Additional error details: Since bower is a user command, there is no need to execute it with superuser permissions. If you're having permission errors when using bower without sudo, please spend a few minutes learning more about how your system should work and make any necessary repairs. http://www.joyent.com/blog/installing-node-and-npm https://gist.github.com/isaacs/579814
You can however run a command with sudo using --allow-root option
解决方法有两种：
1，根据错误提示在bower命令后面加--allow-root ，例如 bower install --allow-root
2，增加一个配置文件使得运行bower时候为root权限，~/.bowerrc
内容如下
{"allow_root": true }
