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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>Go by Example 中文:多返回值</title>
<link rel=stylesheet href="../site.css">
<link rel="canonical" href="http://gobyexample.everyx.in/multiple-return-values/" />
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<div class="example" id="multiple-return-values">
<h2><a href="../">Go by Example 中文</a>：多返回值</h2>
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<td class="docs">
<p>Go 内建<em>多返回值</em> 支持。这个特性在 Go 语言中经常被用到，例如用来同时返回一个函数的结果和错误信息。</p>
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<a href="http://play.golang.org/p/JC2usaawxR"><img title="Run code" src="../play.png" class="run" /></a>
<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
</pre></div>
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<td class="code leading">
<div class="highlight"><pre><span class="kn">import</span> <span class="s">"fmt"</span>
</pre></div>
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<td class="docs">
<p><code>(int, int)</code> 在这个函数中标志着这个函数返回 2 个 <code>int</code>。</p>
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<td class="code leading">
<div class="highlight"><pre><span class="kd">func</span> <span class="nx">vals</span><span class="p">()</span> <span class="p">(</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">7</span>
<span class="p">}</span>
</pre></div>
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
</pre></div>
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<td class="docs">
<p>这里我们通过<em>多赋值</em> 操作来使用这两个不同的返回值。</p>
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<div class="highlight"><pre> <span class="nx">a</span><span class="p">,</span> <span class="nx">b</span> <span class="o">:=</span> <span class="nx">vals</span><span class="p">()</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">a</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">b</span><span class="p">)</span>
</pre></div>
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<td class="docs">
<p>如果你仅仅想返回值的一部分的话，你可以使用空白定义符 <code>_</code>。</p>
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<td class="code">
<div class="highlight"><pre> <span class="nx">_</span><span class="p">,</span> <span class="nx">c</span> <span class="o">:=</span> <span class="nx">vals</span><span class="p">()</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">c</span><span class="p">)</span>
<span class="p">}</span>
</pre></div>
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<td class="code leading">
<div class="highlight"><pre><span class="gp">$</span> go run multiple-return-values.go
<span class="go">3</span>
<span class="go">7</span>
<span class="go">7</span>
</pre></div>
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<td class="docs">
<p>允许可变长参数是 Go 函数的另一个好的特性；我们将在接下来进行学习。</p>
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<p class="next">
下一个例子: <a href="../variadic-functions/">变参函数</a>.
</p>
<p class="footer">
<a href="https://twitter.com/mmcgrana">@mmcgrana</a> 编写 | <a href="https://plus.google.com/u/0/113729799374513477039">everyx</a> 翻译 | <a href="https://github.com/everyx/gobyexample">项目地址</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
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