代码如下 
package main

import (
	"fmt"
)

func mergeAB(a, b []int) []int {
	lenA := len(a)
	lenB := len(b)
	ab := make([]int, lenA+lenB)
	index := 0
	//从首元素开始,将较小的放入到新切片中,再将较小的数组下标加一
	i, j := 0, 0
	for i, j = 0, 0; i < lenA && j < lenB; {
		if a[i] < b[j] {
			ab[index] = a[i]
			index++
			i++
		} else if a[i] > b[j] {
			ab[index] = b[j]
			index++
			j++
		} else {
			ab[index] = a[i]
			index++
			i++
		}
	}
	//一定有一个数组是先遍历完,把另外一个数组的所有元素都添加进去
	for i < lenA {
		ab[index] = a[i]
		i++
		index++
	}
	for j < lenB {
		ab[index] = b[j]
		j++
		index++
	}
	fmt.Println("你好")
	return ab
}

func main() {
	var ab []int
	var a = []int{1, 5, 7, 10}
	var b = []int{2, 6, 9, 13, 19, 90}
	ab = mergeAB(a, b)
	fmt.Println(ab)
	fmt.Println("happy")
}
输出显示