Who knows how the inbox of Apple's mobile calendar is blocked when it receives spam?

If the -iCloud- Calendar option is turned off, you will not be able to receive or view it.

If you have obsessive-compulsive disorder and don't want to turn off your phone and delete spam, then enter the calendar. There is a word "calendar" in the middle of the bottom of the calendar. Click on it, and there is an editor in the upper left corner to check whether spam is at home or at work. Just delete it directly, and then re-create it or not. It doesn't matter.