golang关于defer执行顺序的面试题

<svg xmlns="http://www.w3.org/2000/svg" style="display: none;"><path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"/></svg><blockquote>

这段代码的执行结果是什么?

</blockquote> <pre><code class="lang-go hljs"><span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">defer_call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token function">defer_call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"打印前"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"打印中"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"打印后"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token function">panic</span><span class="token punctuation">(</span><span class="token string">"触发异常"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> </code></pre> <pre><code class="lang-go hljs"><span class="token comment">//执行结果</span> 打印后 打印中 打印前 <span class="token builtin">panic</span><span class="token punctuation">:</span> 触发异常 goroutine <span class="token number">1</span> <span class="token punctuation">[</span>running<span class="token punctuation">]</span><span class="token punctuation">:</span> main<span class="token punctuation">.</span><span class="token function">defer_call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> D<span class="token punctuation">:</span><span class="token operator">/</span>golandWorkapace<span class="token operator">/</span>src<span class="token operator">/</span>cn<span class="token punctuation">.</span>basecommon<span class="token operator">/</span>offer<span class="token operator">/</span>offer1<span class="token operator">/</span>main<span class="token punctuation">.</span><span class="token keyword">go</span><span class="token punctuation">:</span><span class="token number">15</span> <span class="token operator"> </span><span class="token number">0x97</span> main<span class="token punctuation">.</span><span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> D<span class="token punctuation">:</span><span class="token operator">/</span>golandWorkapace<span class="token operator">/</span>src<span class="token operator">/</span>cn<span class="token punctuation">.</span>basecommon<span class="token operator">/</span>offer<span class="token operator">/</span>offer1<span class="token operator">/</span>main<span class="token punctuation">.</span><span class="token keyword">go</span><span class="token punctuation">:</span><span class="token number">8</span> <span class="token operator"> </span><span class="token number">0x17</span> Process finished with exit code <span class="token number">2</span> </code></pre> <blockquote>

defer 的执行顺序是后进先出。当出现 panic 语句的时候，会先按照 defer 的后进先出的顺序执行，最后才会执行panic

</blockquote> <blockquote>

每个defer中会保存上一个定义的defer方法地址 执行完会去寻找调用上一个定义的defer

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