加入：gem "devise", github: "heartcombo/devise"
指令： bundle install
rails generate devise:install
在config/environments/development.rb
Rails.application.configure do
加入：config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
在app/views/layouts/application.html.erb
<body>
加入： <p class="notice"><%= notice %></p>
加入： <p class="alert"><%= alert %></p>
<%= yield %>
</body>
指令：rails generate devise user
rake db:migrate
rails generate devise:views
将app/views/devise/registrations/new.html.erb
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
修改为：<%= form_for(resource, as: resource_name, url: registration_path(resource_name), data: {turbo: false}) do |f| %>
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