在go中，map是一个无序的集合。下面的代码中，展示如何向map中添加key与value,并且最后排序key

    1. package main
    3. import (
    4.     "fmt"
    5.     "math/rand"
    6.     "sort"
    7.     "time"
    8. )
    10. func stuStore()  {
    12.     rand.Seed(time.Now().UnixNano())//init unix otc
    14.     stuMaps := make(map[int]map[string]interface{}) //初始化map
    16.     //循环创建10个key
    17.     for i := 0;i<10;i++ {
    19.         //获取每个key与对应的value
    20.         value,key := stuMaps[i]
    22.         //判断每个key是否存在
    23.         if !key {
    25.             //不存在则将key的value值进行map初始，用于存放个人信息
    26.             value = make(map[string]interface{})
    27.         }
    29.         //添加信息至map
    30.         value["ID"] = i
    31.         value["姓名"] = fmt.Sprintf("stu%d",i)
    32.         value["年龄"] = rand.Intn(25)
    33.         value["分数"] = rand.Float32() *100.0
    35.         //value信息添加结束，赋值给key
    36.         stuMaps[i] = value
    37.     }
    39.     //临时切片，用于存放map的key
    40.     sls := make([]int,0,128)
    42.     //循环map，将key追加至切片
    43.     for k,_ := range stuMaps {
    44.         sls= append(sls,k)
    45.     }
    47.     //对切片进行排序
    48.     sort.Ints(sls)
    50.     //对排序好的key进行输出
    51.     for _,k := range sls {
    52.         fmt.Printf("key :%d, value:%#v\n",k,stuMaps[k])
    53.     }
    54. }
    56. func main()  {
    57.     stuStore()
    58. }

    key :0, value:map[string]interface {}{“ID”:0, “分数”:3.8371809, “姓名”:”stu0”, “年龄”:23}
    key :1, value:map[string]interface {}{“ID”:1, “分数”:64.151695, “姓名”:”stu1”, “年龄”:17}
    key :2, value:map[string]interface {}{“ID”:2, “分数”:30.308903, “姓名”:”stu2”, “年龄”:7}
    key :3, value:map[string]interface {}{“ID”:3, “分数”:26.408901, “姓名”:”stu3”, “年龄”:4}
    key :4, value:map[string]interface {}{“ID”:4, “分数”:19.945482, “姓名”:”stu4”, “年龄”:11}
    key :5, value:map[string]interface {}{“ID”:5, “分数”:83.96999, “姓名”:”stu5”, “年龄”:15}
    key :6, value:map[string]interface {}{“ID”:6, “分数”:22.143503, “姓名”:”stu6”, “年龄”:6}
    key :7, value:map[string]interface {}{“ID”:7, “分数”:32.077267, “姓名”:”stu7”, “年龄”:0}
    key :8, value:map[string]interface {}{“ID”:8, “分数”:51.639027, “姓名”:”stu8”, “年龄”:10}
    key :9, value:map[string]interface {}{“ID”:9, “分数”:93.744835, “姓名”:”stu9”, “年龄”:15}