16.interface{}万能类型

package main
import "fmt"
//interface{}万能类型
func myFunc(arg interface{})  {
    fmt.Println(arg)
}
type Book struct {
    auth string
}
func main() {
    book:=Book{"Golang"}
    myFunc(book)
    myFunc(100)
}

package main
import "fmt"
//interface{}万能类型
func myFunc(arg interface{})  {
    fmt.Println(arg)
    value,ok := arg.(string)
    if !ok{
        fmt.Println("arg is not string")
    }else {
        fmt.Println(value)
    }
}