查看变量类型

reflect.TypeOf(abc)

func main() {
    var abc map[int]string
    tttype := reflect.TypeOf(abc)
    fmt.Println(tttype)
}

查看结构体字段说明

ttType.Fiel(num)

package main
import (
    "fmt"
    "reflect"
)
type TagType struct {
    field1 bool   "An important answer"
    field2 string "The name of the thing"
    field3 int    "How much there are"
}
func refTag(tt TagType, ix int) {
    ttType := reflect.TypeOf(tt)
    ixField := ttType.Field(ix)
    fmt.Printf("%v\n", ixField.Tag)
}
func main() {
    tt := TagType{true, "Barak Obama", 1}
    for i := 0; i < 3; i++ {
        refTag(tt, i)
    }
}
//
An important answer
The name of the thing
How much there are

通过反射修改结构体值

package main
import (
    "fmt"
    "reflect"
)
type T struct {
    A int
    B string
}
func main() {
    t := T{23, "skidoo"}
    s := reflect.ValueOf(&t).Elem()
    typeOfT := s.Type()
    for i := 0; i < s.NumField(); i++ {
        f := s.Field(i)
        fmt.Printf("%d: %s %s = %v\n", i, typeOfT.Field(i).Name, f.Type(), f.Interface())
    }
    s.Field(0).SetInt(77)
    s.Field(1).SetString("hehe")
    fmt.Println("t is now", t)
}
0: A int = 23
1: B string = skidoo
t is now {77 hehe}