golang insertion sort algorithm

The principle of insertion sort algorithm:
the sequence takes a number from the sequence and compares it with the elements on the left. If the element on the left is larger than the number taken, move to the right until the number taken is inserted into the element that is not less than the element on the left. location. Sort of points similar to playing cards.

package main

import "fmt"

func main() {
    numbers := []int{6, 2, 7, 3, 8, 5}
    InsertSort(numbers)

    fmt.Println(numbers)
}

func InsertSort(values []int) {
    length := len(values)
    if length <= 1 {
        return
    }

    for i := 1; i < length; i++ {
        tmp := values[i] // 从第二个数开始，从左向右依次取数
        key := i - 1     // 下标从0开始，依次从左向右

        // 每次取到的数都跟左侧的数做比较，如果左侧的数比取的数大，就将左侧的数右移一位，直至左侧没有数字比取的数大为止
        for key >= 0 && tmp < values[key] {
            values[key+1] = values[key]
            key--
            //fmt.Println(values)
        }

        // 将取到的数插入到不小于左侧数的位置
        if key+1 != i {
            values[key+1] = tmp
        }
        //fmt.Println(values)
    }
}