Window의 popstate 이벤트

• popstate 이벤트가 일어날 때 : active history entry changes while the user navigates the session history

1) changes the current history entry to that of the last page the user visited

2) if history.pushState has been used to add a history entry to the history stack, that history entry is used instead

container에서 seasons, categories를 찾아서 None