Welcome to Jekyll!

References:

直接运行，有依赖缺失：

 \>jekyll serve --watch
 Traceback (most recent call last):
      5: from C:/Ruby25-x64/bin/jekyll:23:in `<main>'
      4: from C:/Ruby25-x64/bin/jekyll:23:in `load'
      3: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/jekyll-3.8.5/exe/jekyll:11:in `<top (required)>'
      2: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/jekyll-3.8.5/lib/jekyll/plugin_manager.rb:48:in `require_from_bundler'
      1: from C:/Ruby25-x64/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
 C:/Ruby25-x64/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- bundler (LoadError)

先按提示安装 Bundler，有点类似于 pip，用于 gem 依赖管理的工具：

 \>gem install jekyll bundler

再用 bundle 安装其它的依赖（根据Gemfile/Gemfile.lock）：

 \>bundle install

再次运行，仍然报错：

 \>jekyll serve --watch

 Configuration file: D:/Code/yingang.github.io/_config.yml
           Source: D:/Code/yingang.github.io
      Destination: D:/Code/yingang.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
      Jekyll Feed: Generating feed for posts
 jekyll 3.8.5 | Error:  File exists @ dir_s_mkdir - D:/Code/yingang.github.io/_site/jekyll

换种方式运行（在 bundle 的上下文执行），还是报同样的错：

 \>bundle exec jekyll serve

 Configuration file: D:/Code/yingang.github.io/_config.yml
           Source: D:/Code/yingang.github.io
      Destination: D:/Code/yingang.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
      Jekyll Feed: Generating feed for posts
 jekyll 3.8.5 | Error:  File exists @ dir_s_mkdir - D:/Code/yingang.github.io/_site/jekyll

对着错误信息仔细看了下，不知道根目录下为什么有个叫 jekyll 的文件。。。删除之

再试下，好了~

 \>bundle exec jekyll serve

 Configuration file: D:/Code/yingang.github.io/_config.yml
           Source: D:/Code/yingang.github.io
      Destination: D:/Code/yingang.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
      Jekyll Feed: Generating feed for posts
                     done in 1.274 seconds.
 Auto-regeneration: enabled for 'D:/Code/yingang.github.io'
 Server address: http://127.0.0.1:4000/
 Server running... press ctrl-c to stop.