on the weekend 与on weekends 完全相等吗我的意思是i play on weekends 等于i play on the weekend

No, not the same
on the weekend - is a specific weekend. E.g. On the weekend that it rained heavily, my house was flooded.
On weekends - is more general for something happens every weekend.
E.g. On weekends we normally go for fishing.

否。
on the weenkend限定了
后者则是一般通用

on the weekend 表示“在周末,在这个周末”,是特指.而
on weekends 表示“在周末”,是泛指,两者不能完全打等号.