https://ruby-china.org/siky en-us <p><a href="http://www.yinwang.org/blog-cn/2014/01/28/rubysonar/" rel="nofollow" target="_blank">http://www.yinwang.org/blog-cn/2014/01/28/rubysonar/</a></p> siky Sat, 01 Feb 2014 00:56:02 +0800 https://ruby-china.org/topics/17067 https://ruby-china.org/topics/17067 <p>在 Rails 项目默认生成的 config.ru 是这样的：</p> <pre class="highlight ruby"><code><span class="c1"># This file is used by Rack-based servers to start the application.</span> <span class="nb">require</span> <span class="o">::</span><span class="no">File</span><span class="p">.</span><span class="nf">expand_path</span><span class="p">(</span><span class="s1">'../config/environment'</span><span class="p">,</span> <span class="kp">__FILE__</span><span class="p">)</span> <span class="n">run</span> <span class="no">Rails</span><span class="p">.</span><span class="nf">application</span> </code></pre> <p>其中::是什么意思？只知道作为模块的作用域操作符的用法。。</p> <p>在 console 中，运行，</p> <pre class="highlight ruby"><code><span class="no">File</span><span class="p">.</span><span class="nf">expand_path</span><span class="p">(</span><span class="s1">'../config/environment'</span><span class="p">,</span> <span class="kp">__FILE__</span><span class="p">)</span> </code></pre> <p>和</p> <pre class="highlight ruby"><code><span class="o">::</span><span class="no">File</span><span class="p">.</span><span class="nf">expand_path</span><span class="p">(</span><span class="s1">'../config/environment'</span><span class="p">,</span> <span class="kp">__FILE__</span><span class="p">)</span> </code></pre> <p>返回的是同样的结果</p> <p>都是 environment.rb 文件的路径。请问在这里::有什么用处么？</p> siky Sat, 04 Jan 2014 20:58:42 +0800 https://ruby-china.org/topics/16623 https://ruby-china.org/topics/16623