关于bower
Bower is a package manager for the web. It offers a generic, unopinionated solution to the problem of front-end package management, while exposing the package dependency model via an API that can be consumed by a more opinionated build stack. There are no system wide dependencies, no dependencies are shared between different apps, and the dependency tree is flat.简单的来说就是：
- 包管理软件，用于前端
- 可以用命令行安装js，如同我们用apt-get install软件一样
安装bower
这里依赖于node以及Npm，所以我们需要安装nodejs，具体可以参见nodejs官网，不过如果是同Mac os或者是Ubuntu的话，可以用类似于brew install npm再安装bower
npm install -g bower
安装js包
创建一个简单的配置文件.bowerrc用于配置Bower安装路径
{
"directory": "public/"
}
安装
bower install angularjs
$ bower install angularjs bower cached git://github.com/angular/angularjs.org.git#58ef7908d9 bower validate 58ef7908d9 against git://github.com/angular/angularjs.org.git#*
如果要安装指定版本就是(转载保留:bower install js使用bower管理js)
bower install <name>=<package>#<version>例如
bower install jquery#1.4