Rails插件安装、使用（1）——calendar_date_select

1. Install the calendar_date_select gem

     gem install calendar_date_select

2. Add a gem dependency to your rails project (in environment.rb)

     config.gem "calendar_date_select"

3. Then, restart/start your rails project. All necessary files will be copied to your public folder.
4. Now include this at the top of your layout: (you'll also need to include prototype, if you haven't already!)

   <%= calendar_date_select_includes "red" # or "blue", or "silver", or nil for the default! %># (if you want more control, you can get a list of stylesheets / javascripts via calendar_date_select_javascripts and calendar_date_select_stylesheets)