golang语言如何将interface转为int, string,slice,struct等类型

package main
import (
 "fmt"
)
type User struct{
 Name string
}
func main() {
 any := User{
  Name: "fidding",
 }
 test(any)
 any2 := "fidding"
 test(any2)
 any3 := int32(123)
 test(any3)
 any4 := int64(123)
 test(any4)
 any5 := []int{1, 2, 3, 4, 5}
 test(any5)
}

// value 允许为任意值
func test(value interface{}) {
 ...
}

package main
import (
 "fmt"
)
type User struct{
 Name string
}
func main() {
 any := User{
  Name: "fidding",
 }
 test(any)
 any2 := "fidding"
 test(any2)
 any3 := int32(123)
 test(any3)
 any4 := int64(123)
 test(any4)
 any5 := []int{1, 2, 3, 4, 5}
 test(any5)
}
func test(value interface{}) {
 switch value.(type) {
 case string:
  // 将interface转为string字符串类型
  op, ok := value.(string)
  fmt.Println(op, ok)
 case int32:
  // 将interface转为int32类型
  op, ok := value.(int32)
  fmt.Println(op, ok)
 case int64:
  // 将interface转为int64类型
  op, ok := value.(int64)
  fmt.Println(op, ok)
 case User:
  // 将interface转为User struct类型，并使用其Name对象
  op, ok := value.(User)
  fmt.Println(op.Name, ok)
 case []int:
  // 将interface转为切片类型
  op := make([]int, 0)
  op = value.([]int)
  fmt.Println(op)
 default:
  fmt.Println("unknown")
 }
}

// 如果转换失败ok=false，转换成功ok=true
res, ok := anyInterface.(someType)