Included jQuery not works under production mode raise `is not a function` error

Question

I put the jquery.placeholder.js under assets/javascripts folder

then apply the function in my coffeescript file and works fine.

$(document).ready ->
  $('input, textarea').placeholder();

However, When I run in production mode by RAILS_ENV=production rails s

Raise not a function error on Firebug console

I put other related files on gist

https://gist.github.com/poc7667/7576566

Answer 1

取消注释行：config / enviroments / production.rb中为50，并在其中添加jquery.placeholder.js以对其进行预编译

config.assets.precompile += %w( jquery.placeholder.js )