Quickly convert map to ordered array

    take out the key of map and put it into a slice s to sort and traverse, V: = range s, take the value: map [v] from the map and put it in the array in turn 0

    var err error
msgs = make([]*configModel.SysMailMsg, len(cacheMap))
keys := make([]int, len(cacheMap))

i := 0
for k, _ := range cacheMap {
   if keys[i], err = strconv.Atoi(k); err != nil {
      return nil, err
   }
   i++
}
sort.Ints(keys)
mi := 0
for _, v := range keys {
   var tmp configModel.SysMailMsg
   json.UnmarshalFromString(cacheMap[strconv.Itoa(v)], &tmp)
   msgs[mi] = &tmp
   mi++
}

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