默认动作就是在执行存储过程之后进行回滚。
The default action is to roll back after executing the stored procedure.
停止事件传播本身不会禁止默认动作的执行。
Stopping the event propagation doesn't by itself prevent the default action.
一个单独的api特性允许取消默认动作，无论传播过程中发生什么事。
A separate API feature allows the default action to be cancelled, regardless of whatever else happens during propagation.
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