func main() {
var s []int
printSlice(s)

// 添加一个空切片
s = append(s, 0)
printSlice(s)

// 这个切片会按需增长
s = append(s, 1)
printSlice(s)

// 可以一次性添加多个元素
s = append(s, 2, 3, 4)
printSlice(s)
printSlice(s)
s = append(s, 5, 6)
printSlice(s)

}

func printSlice(s []int) {
fmt.Printf(“len=%d cap=%d %v\n”, len(s), cap(s), s)

输入出结果：

func main() {
var s []int
printSlice(s)

// 添加一个空切片
s = append(s, 0)
printSlice(s)

// 这个切片会按需增长
s = append(s, 1)
printSlice(s)

// 可以一次性添加多个元素
s = append(s, 2, 3, 4)
printSlice(s)
printSlice(s)
s = append(s, 5, 6)
printSlice(s)

}

func printSlice(s []int) {
fmt.Printf(“len=%d cap=%d %v\n”, len(s), cap(s), s)
1
package main
2
​
3
import “fmt”
4
​
5
func main() {
6
var s []int
7
printSlice(s)
8
​
9
// 添加一个空切片
10
s = append(s, 0)
11
printSlice(s)
12
​
13
// 这个切片会按需增长
14
s = append(s, 1)
15
printSlice(s)
16
​
17
// 可以一次性添加多个元素
18
s = append(s, 2, 3, 4)
19
printSlice(s)
20
printSlice(s)
21
s = append(s, 5, 6)
22
printSlice(s)
23
}
24
​
25
func printSlice(s []int) {
26
fmt.Printf(“len=%d cap=%d %v\n”, len(s), cap(s), s)
27
}
28
​
len=0 cap=0 []
len=1 cap=1 [0]
len=2 cap=2 [0 1]
len=5 cap=6 [0 1 2 3 4]
len=5 cap=6 [0 1 2 3 4] *《====切片长度与容量，应该一样多吧，这里有点不理解*
len=7 cap=12 [0 1 2 3 4 5 6] *《====切片长度与容量，应该一样多吧，这里有点不理解*