Gemfile

# 弃用 gem 'font-awesome-rails', '~> 4.7'
# 前端图标icon
gem 'font-awesome-sass', '~> 5.8'

application.html.rb

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">

fontawesome doesn't work 显示为正方形

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