常见类型的默认实现

go sort包默认支持int（sort.Ints(x []int)）、float64s（sort.Float64s(x []float64)）、string（sort.Strings(x []string)）从小到大排序，反序使用类似于sort.Sort(sort.Reverse(sort.Ints(x []int)))的方式。

结构体切片的自定义实现

package main

import (
	"fmt"
	"sort"
)

type Student struct {
	Age    int
	Score int
}

type StudentSort []Student

func (s StudentSort) Len() int {
	return len(s)
}

func (s StudentSort) Swap(i, j int) {
	s[i], s[j] = s[j], s[i]
}

func (s StudentSort) Less(i, j int) bool {
	return s[i].Score > s[j].Score
}

func main() {
	s := []Student{
		{Age:15, Score:1},
		{Age:16, Score:0},
		{Age:17, Score:30},
		{Age:18, Score:50},
		{Age:19, Score:40},
	}
	sort.Sort(StudentSort(s))
	fmt.Printf("%+v", s)
}