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                ## 通過斷言接口來詢問行為(方法) ~~~ type Show interface { Display() } type View interface { Show View() } type User struct { } func (s User) Display() { } func (s User) View() { } func main() { u := User{} DisplayView(u) } func DisplayView(s Show) { //s.Display() 此時,s只有Display方法,而沒有View方法,但是我們就是在有View方法的時候,先用View方法怎么辦呢? 因為View方法可能比Display性能更好. 這就叫做**斷言查詢接口的行為** type OtherView interface { View() } if v, ok := s.(OtherView); ok { v.View() return } v.Display() } ~~~
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