【where u at】atcampus与oncampus有什么不同

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【答案】 at and on is similar
　　depending on the object
　　but for example ,you can say I am on home,it should be I am at home.
　　you can also say I am at the bus now .I am on the bus now.I am in the bus now.
　　as far as I know
　　at = a place where you are
　　on = a place where u are,your position,your situation
　　About at campus / on campus.
　　for example ：Mary is at her campus having her maths class now.
　　Mary in on campus having her class now
　　Normally you do not add sb's between on and campus,but you can add sb's between at and her campus.cos the campus is a place that belongs to everyone