https://ruby-china.org/kuqin91 en-us <pre class="highlight ruby"><code><span class="n">a</span> <span class="o">=</span> <span class="s2">"hello"</span> <span class="nb">puts</span> <span class="n">a</span><span class="p">[</span><span class="mi">4</span><span class="p">,</span><span class="mi">1</span><span class="p">]</span> <span class="c1"># =&gt; o</span> <span class="nb">puts</span> <span class="n">a</span><span class="p">[</span><span class="mi">5</span><span class="p">,</span><span class="mi">1</span><span class="p">]</span> <span class="c1"># =&gt; ""</span> <span class="nb">puts</span> <span class="n">a</span><span class="p">[</span><span class="mi">6</span><span class="p">,</span><span class="mi">1</span><span class="p">]</span> <span class="c1"># =&gt; nil </span> </code></pre> <p>请问大佬们为啥 a[5,1] 是 "" 呢？ </p> kuqin91 Mon, 09 Jan 2023 16:27:09 +0800 https://ruby-china.org/topics/42827 https://ruby-china.org/topics/42827