golang使用slice中遇到的坑

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package main   import (     "fmt" )   func sliceFunc(i []int, num int) []int {     for j := 0; j < num; j++ {         i = append(i, 3)     }     i[0] = num     return i } func main() {     s := make([]int, 0, 3)     s = append(s, 1)     fmt.Printf("cap=%d\ts=%v\n",cap(s),s)     fmt.Println("=========")     s1 := sliceFunc(s, 2)     fmt.Printf("cap=%d\ts=%v\n",cap(s),s)     fmt.Printf("cap=%d\ts1=%v\n",cap(s1),s1)     fmt.Println("=========")     s2 := sliceFunc(s, 3)     fmt.Printf("cap=%d\ts=%v\n",cap(s),s)     fmt.Printf("cap=%d\ts1=%v\n",cap(s1),s1)     fmt.Printf("cap=%d\ts1=%v",cap(s2),s2) } //当切片扩容的时候会导致slice重新分配内存地址，所有S1改变了的s[0]的值，而s2并没有改变

　　原因：切片扩容的时候会导致slice重新分配内存地址