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golang传递基本类型的不同</h2>
<ol><li>golang传递值类型是指复制了一份值之后传递，改变形参并不能改变原有实参的值</li></ol><pre><code class="lang-go hljs"><span class="token keyword">package</span> main
<span class="token keyword">import</span> <span class="token punctuation">(</span>
<span class="token string">"fmt"</span>
<span class="token punctuation">)</span>
<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>
a <span class="token operator">:=</span> <span class="token number">888</span>
<span class="token function">changeint</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">//888</span>
<span class="token punctuation">}</span>
<span class="token keyword">func</span> <span class="token function">changeint</span><span class="token punctuation">(</span>int1 <span class="token builtin">int</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
int1 <span class="token operator">=</span> <span class="token number">999</span>
<span class="token punctuation">}</span>
</code></pre>
<ol start="2"><li>golang传递引用类型是传递地址，改变形参会改变原有实参的值</li></ol><pre><code class="lang-go hljs"><span class="token keyword">package</span> main
<span class="token keyword">import</span> <span class="token punctuation">(</span>
<span class="token string">"fmt"</span>
<span class="token punctuation">)</span>
<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>
a <span class="token operator">:=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span>
a<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">888</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">//map[1:888]</span>
<span class="token function">changemap</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">//map[1:999]</span>
<span class="token punctuation">}</span>
<span class="token keyword">func</span> <span class="token function">changemap</span><span class="token punctuation">(</span>map1 <span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
map1<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">999</span>
<span class="token punctuation">}</span>
</code></pre>
<ol start="3"><li>golang引用类型传递之后整体赋值，并不能改变原有实参的值</li></ol><pre><code class="lang-go hljs"><span class="token keyword">package</span> main
<span class="token keyword">import</span> <span class="token punctuation">(</span>
<span class="token string">"fmt"</span>
<span class="token punctuation">)</span>
<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>
a <span class="token operator">:=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span>
a<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">888</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">//map[1:888]</span>
<span class="token function">changemap</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">//map[1:888]</span>
<span class="token punctuation">}</span>
<span class="token keyword">func</span> <span class="token function">changemap</span><span class="token punctuation">(</span>map1 <span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
map2 <span class="token operator">:=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span>
map2<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">999</span>
map1 <span class="token operator">=</span> map2
<span class="token punctuation">}</span>
</code></pre>
注：引用进行第二次赋值的时候，实际上把这份引用指向了另外一个变量，所以之后对这个变量的操作不会影响到外部的对象。
<ol start="4"><li>golang任何类型的全局变量都能被形参改变</li></ol><pre><code class="lang-go hljs"><span class="token keyword">package</span> main
<span class="token keyword">import</span> <span class="token punctuation">(</span>
<span class="token string">"fmt"</span>
<span class="token punctuation">)</span>
<span class="token keyword">var</span> map1 <span class="token operator">=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span>
<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>
map1<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">888</span>
map2 <span class="token operator">:=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span>
map2<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">999</span>
<span class="token function">changemap</span><span class="token punctuation">(</span>map2<span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>map1<span class="token punctuation">)</span> <span class="token comment">//map[1:999]</span>
<span class="token punctuation">}</span>
<span class="token keyword">func</span> <span class="token function">changemap</span><span class="token punctuation">(</span>map2 <span class="token keyword">map</span><span class="token punctuation">[</span><span class="token builtin">int</span><span class="token punctuation">]</span><span class="token builtin">int</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
map1 <span class="token operator">=</span> map2
<span class="token punctuation">}</span>
</code></pre>
<ol start="5"><li>golang传递值类型想要改变实参，需要传递值类型的指针</li></ol><pre><code class="lang-go hljs"><span class="token keyword">package</span> main
<span class="token keyword">import</span> <span class="token punctuation">(</span>
<span class="token string">"fmt"</span>
<span class="token punctuation">)</span>
<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>
a <span class="token operator">:=</span> <span class="token number">888</span>
<span class="token function">changeint</span><span class="token punctuation">(</span><span class="token operator">&</span>a<span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">//999</span>
<span class="token punctuation">}</span>
<span class="token keyword">func</span> <span class="token function">changeint</span><span class="token punctuation">(</span>int1 <span class="token operator">*</span><span class="token builtin">int</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token operator">*</span>int1 <span class="token operator">=</span> <span class="token number">999</span>
</code></pre>
6.golang传递值类型时通常传递指针（在对象较大时能够提升性能，减少内存使用），同时传递类型要做到统一
<blockquote class="layui-elem-quote" style="width: 100%;overflow:hidden">
作者： csdniter
链接： https://blog.csdn.net/csdniter/article/details/106122520
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
</blockquote>
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