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  <h1>七哥的随心谈</h1>
  <h2>A Hugo Theme</h2>
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    <h2><a href="http://blog.thinkqs.com/post/golang-qa/">Golang学习问题1</a></h2>

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    <time>07 Sep 2016, 13:48</time>
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  go编译出的程序有系统依赖吗? 有,go是编译性语言. slice内存,引用数组的内存 package main import &quot;fmt&quot; func main() { d := []int{1, 2, 3, 4} e := d[2:] f := e fmt.Println(&quot;d1 =&quot;, d) fmt.Println(&quot;e1 =&quot;, e) fmt.Println(&quot;f1 =&quot;, f) e = append(e, 5, 6) e[1] = 7 fmt.Println(&quot;d2 =&quot;, d) fmt.Println(&quot;e2 =&quot;, e) fmt.Println(&quot;f2 =&quot;, f) } e在append前指向d[2:], append后超出cap, 新分配cap*2的内存并copy原数据 d在append前,对e进行操作d会受到影响,append后不再受影响. f并没有受e的append影响,仍然保留原值. nil slice和empty slice的append内存扩展机制 var slice []int fmt.Println(&quot;nil len =&quot;, len(slice)) fmt.Println(&quot;nil cap =&quot;, cap(slice)) newSlice := append(slice, 5, 99) fmt.Println(&quot;newSlice len =&quot;, len(newSlice)) fmt.Println(&quot;newSlice cap =&quot;, cap(newSlice)) newSlice = append(newSlice, 6) fmt.Println(&quot;newSlice len =&quot;, len(newSlice)) fmt.Println(&quot;newSlice cap =&quot;, cap(newSlice)) newSlice = append(newSlice, 7) fmt.Println(&quot;newSlice len =&quot;, len(newSlice)) fmt.Println(&quot;newSlice cap =&quot;, cap(newSlice)) 初始len和cap为0 第一次append n个数据后, len和cap为n 之后规则和正常数组相同 不要通过共享来通信,而要通过通信来共享.
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