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exit.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example 中文版: 退出</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'signals';
}
}
</script>
<body>
<div class="example" id="exit">
<h2><a href="./">Go by Example 中文版</a>: 退出</h2>
<table>
<tr>
<td class="docs">
<p>使用 <code>os.Exit</code> 可以立即以给定的状态退出程序。</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://play.studygolang.com/p/bCbyKrDgHm3"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"os"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>当使用 <code>os.Exit</code> 时 <code>defer</code> 将<em>不会</em> 被执行，
所以这里的 <code>fmt.Println</code> 将永远不会被调用。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="k">defer</span> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"!"</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>退出并且退出状态为 3。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">os</span><span class="p">.</span><span class="nf">Exit</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>注意，不像例如 C 语言，Go 不使用在 <code>main</code> 中返回一个整数来指明退出状态。
如果你想以非零状态退出，那么你就要使用 <code>os.Exit</code>。</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
<p>如果你使用 <code>go run</code> 来运行 <code>exit.go</code>，那么退出状态将会被 <code>go</code> 捕获并打印。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="gp">$</span> go run exit.go
<span class="go">exit status 3</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>通过编译并执行一个二进制文件的方式，你可以在终端中查看退出状态。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="gp">$</span> go build exit.go
<span class="gp">$</span> ./exit
<span class="gp">$</span> echo $?
<span class="go">3</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>注意，程序中的 <code>!</code> 永远不会被打印出来。</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="footer">
<a href="https://twitter.com/mmcgrana">@mmcgrana</a> 和<a href="https://eli.thegreenplace.net">Eli Bendersky</a>编写 | <a href="https://github.com/gobyexample-cn">gobyexample-cn</a> 翻译 | <a href="https://github.com/gobyexample-cn/gobyexample/issues">反馈</a> | <a href="https://github.com/gobyexample-cn/gobyexample">源码</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a> </p>
</p>
</div>
<script>
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</body>
</html>