YSK that if your Apple device doesn’t bring you to your WiFi login website page (such as an airport or school), you can type captive.apple.com and it’ll bring it up.
from /r/YouShouldKnow
YSK說，如果你的蘋果設備沒有把你帶到你的WiFi登錄網站頁面（如機場或學校），你可以輸入captive.apple.com，它會把它帶出來。