标准操作只需要三部：
- 安装gem：
gem install bundler jekyll - 生成站点：
jekyll new my-awesome-site - 启动站点：
bundle exec jekyll serve
bundle exec jekyll serve --drafts
VS.
hugo server --watch --verbose --buildDrafts
以为会简单许多，还是可能会遇到不同的问题。但Mac上会给出清楚的提示，按照提示执行即可。
- Ruby 版本过低
brew install ruby - 更新变化变量
echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.zshrc; source ~/.zshrc - 安装兼容版本
bundle update
Mac上默认的ruby版本似乎有点低。安装gem install bundle jekyll时提示jekyll-sass-converter requires Ruby version >= 2.4.0.，需要先升级一下ruby版本：brew install ruby
安装完成后，需要更新下PATH
echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.zshrc
source ~/.zshrc
#检查ruby 版本
➜ ruby -v
ruby 2.3.7p456 (2018-03-28 revision 63024) [universal.x86_64-darwin18]
➜ source ~/.zshrc
➜ ruby -v
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin18]
然后再安装jekyll gem install jekyll，会花费一些时间。
启动站点 bundle exec jekyll serve提示不兼容。
bundle exec jekyll serve
Bundler could not find compatible versions for gem "nokogiri":
In snapshot (Gemfile.lock):
nokogiri (= 1.10.7)
In Gemfile:
github-pages (~> 203) was resolved to 203, which depends on
nokogiri (>= 1.10.4, < 2.0)
Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.