1、append函数的使用

作用：在原切片的末尾添加元素

示例：  

package main //必须有个main包import "fmt"func main() {	s1 := []int{}	fmt.Printf("len = %d, cap = %d\n", len(s1), cap(s1))	fmt.Println("s1 = ", s1)	//在原切片的末尾添加元素	s1 = append(s1, 1)	s1 = append(s1, 2)	s1 = append(s1, 3)	fmt.Printf("len = %d, cap = %d\n", len(s1), cap(s1))	fmt.Println("s1 = ", s1)	s2 := []int{1, 2, 3}	fmt.Println("s2 = ", s2)	s2 = append(s2, 5)	s2 = append(s2, 5)	s2 = append(s2, 5)	fmt.Println("s2 = ", s2)}

#执行结果：

len = 0, cap = 0s1 =  []len = 3, cap = 4s1 =  [1 2 3]s2 =  [1 2 3]s2 =  [1 2 3 5 5 5]