如何让@ screen-sm @ screen-md @ screen-lg变量起作用,而不是给我错误? 在使用bootstrap-sass gem的rails中?

当我删除@ screen-sm @ screen-md @ screen-lg变量并用像素值替换它们时,浏览器中的错误就会消失。 但是当我使用这些变量时,浏览器rails错误说这些参数无效。

我正在使用bootstrap-sasts 3.0.3。

我的application.js文件中也有//=require bootstrap github页面https://github.com/twbs/bootstrap-sass说这样做会导致变量在其他文件中不可用,但即使我从我的js文件中删除了这一行,我仍然无法使用变量我的application.css.scss文件。

application.css.scss

*= require_self
*= require_tree .
*/
@import "bootstrap";

/* Small devices (tablets, 768px and up) */
@media only screen and (min-width: @screen-sm){ 

}

/* Medium devices (desktops, 992px and up) */
@media only screen and (min-width: @screen-md){ 

}

/* Large devices (large desktops, 1200px and up) */
@media only screen and (min-width: @screen-lg){ 

}

的Gemfile

    source 'https://rubygems.org'
    ruby "2.0.0"

    gem 'rails', '4.0.0'
    gem 'uglifier', '>= 1.3.0'
    gem 'sass-rails', '~> 4.0.0'
    gem 'coffee-rails', '~> 4.0.0'
    gem 'jquery-rails'
    gem 'turbolinks'
    gem 'jquery-turbolinks'
    gem 'jbuilder', '~> 1.2'
    gem 'sprockets-rails', :require => 'sprockets/railtie'

    group :doc do
      # bundle exec rake doc:rails generates the API under doc/api.
      gem 'sdoc', require: false
    end

    gem 'html2haml', '~> 1.0.1'
    gem 'haml-rails', '0.5.1'
    gem 'bootstrap-sass', '~> 3.0.3.0'

    gem 'figaro', '~> 0.7.0'
    gem 'nokogiri', '~> 1.6.0'
    gem 'paperclip', '~> 3.0'
    gem 'paperclip-dropbox', '>= 1.1.7'
    gem 'devise'

    group :development do
        # erubis is already included in action pack
        gem 'ruby_parser', '~> 3.1.1'
    end

    group :development, :test do
      gem 'sqlite3'
    end

    group :production do
      gem 'pg'
      gem 'rails_12factor'

      #gem 'aws-sdk', "~> 1.0"
    end

    # Use ActiveModel has_secure_password
    # gem 'bcrypt-ruby', '~> 3.0.0'

    # Use unicorn as the app server
    # gem 'unicorn'

    # Use Capistrano for deployment
    # gem 'capistrano', group: :development

    # Use debugger
    # gem 'debugger', group: [:development, :test]

===============>>#1 票数:2 已采纳

今天我遇到了同样的问题。 我认为问题的根源在于你正在混合语法(Less vs sass)。

如果您正在编写一个面向较少的样式表变量,则使用@运算符引用。 而使用scass编写样式表(我推断,因为application.css.scss文件的名称)变量是使用$引用的。

因此,您的样式表必须写成如下:

...

@import "bootstrap";

/* Small devices (tablets, 768px and up) */
@media only screen and (min-width: $screen-sm){ 

}

...

  ask by ahnbizcad translate from so

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