背景：需要对几个类似的结构体（拥有相同的方法）做相同的操作，用interface类型可以轻松地实现。
如下例所示，RouteDaySumModel和RouteMonthSumModel拥有相同的function，当需要对其做Fix操作时，可以定义一个interface类型FixSummary来处理：
package main
import (
"time"
"fmt"
)
//日表汇总
type RouteDaySumModel struct {
Id int64
UserId string
CurDay time.Time
SportsType int
Count int
TotalLength float64
TotalTime float64
TotalCalory float64
}
func (rdsM *RouteDaySumModel) Print() {
fmt.Println(rdsM)
}
func (rdsM *RouteDaySumModel) SetValue(totalTime, totalLength, totalCalory float64, count int) {
rdsM.TotalTime = totalTime
rdsM.TotalLength = totalLength
rdsM.TotalCalory = totalCalory
rdsM.Count = count
}
//月表汇总
type RouteMonthSumModel struct {
Id int64
UserId string
CurDay time.Time
SportsType int
Count int
TotalLength float64
TotalTime float64
TotalCalory float64
}
func (rmsM *RouteMonthSumModel) Print() {
fmt.Println(rmsM)
}
func (rmsM *RouteMonthSumModel) SetValue(totalTime, totalLength, totalCalory float64, count int) {
rmsM.TotalTime = totalTime
rmsM.TotalLength = totalLength
rmsM.TotalCalory = totalCalory
rmsM.Count = count
}
type FixSummary interface {
SetValue(totalTime, totalLength, totalCalory float64, count int)
Print()
}
func Fix(totalTime, totalLength, totalCalory float64, count int, obj FixSummary) {
obj.SetValue(totalTime, totalLength, totalCalory, count)
obj.Print()
}
func main() {
rdsM := RouteDaySumModel{
UserId: "baixiao0",
}
rdsM.Print()
Fix(11.11, 22.22, 33.33, 1, &rdsM)
rmsM := RouteMonthSumModel{
UserId: "baixiao1",
}
rmsM.Print()
Fix(99.99, 88.88, 77.77, 2, &rmsM)
}